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davideiannone.bsky.social
Davide Iannone
@davideiannone.bsky.social
66 followers 80 following 49 posts
The truth of a theorem, the mathematical models of the physics, the methods of the astronomy, the citizen science.
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davideiannone.bsky.social
Infrared structures seen into near galaxies

Target: PGC 13826
RAJ2000: 56.704583333333325
DEJ2000: 68.09666666666666

#astronomy
#galaxy
#pgc13826
CATALOG AND INSTRUMENTAL DATA ABOUT THE OBJECT Target: PGC 13826 Other names (from the catalog): IC342, UGC2847, MCG11-05-003, CGCG305-2, IRAS03419+6756 RAJ2000: 56.704583333333325 DEJ2000: 68.09666666666666 Cutout size (arcmin): 25 x 25 Spectral Band: IRAC 4 (central wavelength: 8 micrometers) MJD_start: 53672.5553323147 MJD_stop: 53672.582437708 Image_Name: SPITZER_I4_14914304_0000_5_E8673215_maic.fits Origin of the sources: PAH (Polycyclic aromatic hydrocarbons) / ice of Methane Angular resolution (arcsec): 1.98 Resampling: original image scale BGlevel: 1.49387 (MJy/sr) CorePeak: 961.676 (MJy/sr) Histogram Cut Range: [BGlevel , CorePeak] Signal scale: logarithmic LogExp parameter (DS9, Log scale): 1e+06 CREDITS Catalog: Principal Galaxy Catalogue 2003 (PGC2003) - https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/237 HyperLEDA reference: http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=pgc%2013826 Image archive and Mission: IRSA - https://irsa.ipac.caltech.edu/frontpage/ , Spitzer Space Telescope TOPCAT (for the Table Access Protocol query and the Simple Image Access query): https://www.star.bris.ac.uk/~mbt/topcat/ SIA service: "Spitzer Heritage Archive" DS9 (for the image analysis): https://sites.google.com/cfa.harvard.edu/saoimageds9/home References for the spectral features in this image: https://iopscience.iop.org/article/10.1086/376697/pdf (table 4) https://arxiv.org/pdf/astro-ph/0405616 (figure 3) https://iopscience.iop.org/article/10.1088/0004-6256/140/6/1868/pdf (figure 7) https://irsa.ipac.caltech.edu/data/SPITZER/Enhanced/SEIP/docs/seip_explanatory_supplement_v3.pdf CATALOG AND INSTRUMENTAL DATA ABOUT THE OBJECT Target: PGC 13826 Other names (from the catalog): IC342, UGC2847, MCG11-05-003, CGCG305-2, IRAS03419+6756 RAJ2000: 56.704583333333325 DEJ2000: 68.09666666666666 Cutout size (arcmin): 20 x 20 Spectral Band: MIPS24 (central wavelength: 24 micrometers) MJD_start: 53061.5993641205 MJD_stop: 53061.6344803125 Image_Name: SPITZER_M1_9182208_0000_9_E6475872_maic.fits Origin of the sources: Iron oxides Angular resolution (arcsec): 6 Resampling: original image scale BGlevel: 26.035 (MJy/sr) CorePeak: 2470.37 (MJy/sr) Histogram Cut Range: [BGlevel , CorePeak] Signal scale: logarithmic LogExp parameter (DS9, Log scale): 1e+06 CREDITS Catalog: Principal Galaxy Catalogue 2003 (PGC2003) - https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/237 HyperLEDA reference: http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=pgc%2013826 Image archive and Mission: IRSA - https://irsa.ipac.caltech.edu/frontpage/ , Spitzer Space Telescope TOPCAT (for the Table Access Protocol query and the Simple Image Access query): https://www.star.bris.ac.uk/~mbt/topcat/ SIA service: "Spitzer Heritage Archive" DS9 (for the image analysis): https://sites.google.com/cfa.harvard.edu/saoimageds9/home References for the spectral features in this image: https://iopscience.iop.org/article/10.1086/376697/pdf (table 4) https://arxiv.org/pdf/astro-ph/0405616 (figure 3) https://iopscience.iop.org/article/10.1088/0004-6256/140/6/1868/pdf (figure 7) https://irsa.ipac.caltech.edu/data/SPITZER/Enhanced/SEIP/docs/seip_explanatory_supplement_v3.pdf CATALOG AND INSTRUMENTAL DATA ABOUT THE OBJECT Target: PGC 13826 Other names (from the catalog): IC342, UGC2847, MCG11-05-003, CGCG305-2, IRAS03419+6756 RAJ2000: 56.704583333333325 DEJ2000: 68.09666666666666 Cutout size (arcmin): 20 x 20 Spectral Band: W3 (central wavelength: 12 micrometers) MJD_start: 55249.248521261616 MJD_stop: 55255.66673084488 Image_Name: 0553p681_ac51-w3-int-3.fits Origin of the sources: PAH / Amorphous Silicates / Silicate Crystals / ice of carbon dioxide Angular resolution (arcsec): 6.5 Resampling: original image scale BGlevel: 415.224 (DN) CorePeak: 5960.81 (DN) Histogram Cut Range: [BGlevel , CorePeak] Signal scale: logarithmic LogExp parameter (DS9, Log scale): 1e+04 CREDITS Catalog: Principal Galaxy Catalogue 2003 (PGC2003) - https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/237 HyperLEDA reference: http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=pgc%2013826 Image archive and Mission: IRSA - https://irsa.ipac.caltech.edu/frontpage/ , WISE - Wide-field Infrared Survey Explorer TOPCAT (for the Table Access Protocol query and the Simple Image Access query): https://www.star.bris.ac.uk/~mbt/topcat/ SIA service: "WISE AllWISE Image Atlas" DS9 (for the image analysis): https://sites.google.com/cfa.harvard.edu/saoimageds9/home References for the spectral features in this image: https://iopscience.iop.org/article/10.1086/376697/pdf (table 4) https://arxiv.org/pdf/astro-ph/0405616 (figure 3) https://iopscience.iop.org/article/10.1088/0004-6256/140/6/1868/pdf (figure 7) https://irsa.ipac.caltech.edu/data/SPITZER/Enhanced/SEIP/docs/seip_explanatory_supplement_v3.pdf CATALOG AND INSTRUMENTAL DATA ABOUT THE OBJECT Target: PGC 13826 Other names (from the catalog): IC342, UGC2847, MCG11-05-003, CGCG305-2, IRAS03419+6756 RAJ2000: 56.704583333333325 DEJ2000: 68.09666666666666 Cutout size (arcmin): 20 x 20 Spectral Band: W4 (central wavelength: 22 micrometers) MJD_start: 55249.248521261616 MJD_stop: 55255.66673084488 Image_Name: 0553p681_ac51-w4-int-3.fits Origin of the sources: Iron oxides Angular resolution (arcsec): 12 Resampling: original image scale BGlevel: 115.41 (DN) CorePeak: 814.299 (DN) Histogram Cut Range: [BGlevel , CorePeak] Signal scale: logarithmic LogExp parameter (DS9, Log scale): 1e+04 CREDITS Catalog: Principal Galaxy Catalogue 2003 (PGC2003) - https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/237 HyperLEDA reference: http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=pgc%2013826 Image archive and Mission: IRSA - https://irsa.ipac.caltech.edu/frontpage/ , WISE - Wide-field Infrared Survey Explorer TOPCAT (for the Table Access Protocol query and the Simple Image Access query): https://www.star.bris.ac.uk/~mbt/topcat/ SIA service: "WISE AllWISE Image Atlas" DS9 (for the image analysis): https://sites.google.com/cfa.harvard.edu/saoimageds9/home References for the spectral features in this image: https://iopscience.iop.org/article/10.1086/376697/pdf (table 4) https://arxiv.org/pdf/astro-ph/0405616 (figure 3) https://iopscience.iop.org/article/10.1088/0004-6256/140/6/1868/pdf (figure 7) https://irsa.ipac.caltech.edu/data/SPITZER/Enhanced/SEIP/docs/seip_explanatory_supplement_v3.pdf
January 19, 2026 at 11:03 AM
davideiannone.bsky.social
Variable Stars from the Gaia DR3 Epoch Photometry by the G-band fluxes.

This is an amateur approach to the analysis of the light from a variable star.

Gaia DR3 409684702600599424
Coordinates (2016.0): 24.07735600488 , 56.47612360587

#variablestars #gaia #stellarastro
#gaiadr3_409684702600599424
*** Variable Stars from the Gaia DR3 Epoch Photometry by the G-band fluxes *** This is an amateur approach to the analysis of the light from a variable star The diagram shown here is the "phase plot" of the flux (in logarithmic scale, namely "magnitudes") from a star which brightness changes over time The X-axis represents the "phases of the oscillation": from the phase 0 to the phase 1 we explore the oscillation period in adimensional units Gaia DR3 409684702600599424 Position (epoch 2016.0): 24.07735600488 , 56.47612360587 RUWE (astrometric single-star parameter, 1=single): 0.968 Frequency (doubled for the Fourier Analysis): 3.025336 /d Standard Error of the Frequency: 0.000033999689 /d Period: 0.661083595342 d Semi-amplitude of the fundamental Fourier term: 0.191206586408 mag (G-band) Standard Error of the Semi-amplitude: 0.011810557294 mag (G-mag) Amplitude of the oscillation: 0.583695 mag (G-band) Morphological Class (my estimation): b1P (eclipsing binary star of Beta-Lyrae type, with positive O'Connell Effect - different maxima with the absolute maximum close to the orbital phase 0.25 if the absolute minimum was to the phases -1, 0, +1) Variability Class (from Gaia DR3 - Variability): ECL Credits: TOPCAT --> https://www.star.bris.ac.uk/~mbt/topcat/ VStar --> https://www.aavso.org/vstar TAP service --> https://gaia.aip.de/datalink/links Data table: gaiadr3.epoch_photometry Filter on the table: n_transits > 109 Gaia DR3 Part 1 - Main Table - I/355 (on VizieR) Gaia DR3 Variability - I/358 (on VizieR) Gaia DR3: This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The Power Spectrum, from the Discrete Fourier Transform Analysis, about the frequencies of the periodic signal from this variable star. The spectral frequency resolution was: 0.0005 /d Compare these frequency peaks with the ones of the Spectral Window (other diagram). The Power Spectrum, from the Discrete Fourier Transform Analysis, about the frequencies of the explored spectral window: these frequencies are "alias", not real. The spectral frequency resolution was: 0.0005 /d
July 13, 2025 at 4:34 PM
davideiannone.bsky.social
Slow variable pointwise radio source from my collections on Zooniverse

Coordinates:
282.206987053898 , -1.49966214209343

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786879 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786879 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 Almost all of the error bars are smaller than the diameter of the dots, still showing a significative dynamic range in the flux density over the time. The variability amplitude is about 40 mJy, excluding the outliers. The median flux is about 15.7 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a first distinctive growing phase between the epochs 59300 MJD - 59350 MJD; a falling phase between the epochs 59350 MJD - 59425 MJD; a second prominent growing phase between the epochs 59425 MJD - 59525 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
April 3, 2025 at 8:23 PM
davideiannone.bsky.social
Fast variable pointwise radio source from my collections on Zooniverse

Coordinates:
270.49949659664 , -29.876944065209997

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70790078 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70790078 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 1.75 mJy, excluding the outliers. The median flux is about 34.45 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 29, 2025 at 9:49 PM
davideiannone.bsky.social
Extended stable radio source from my collections on Zooniverse

Coordinates:
282.665813752953 , -1.0538110718629101

Data Credits: Project "Bursts from Space: MeerKAT"

Click the image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786719 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786719 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The extension of the error bars, and the distribution of the dots in the light curve excluding the outliers, show a stable flux around 1.92 mJy. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 22, 2025 at 10:12 PM
davideiannone.bsky.social
Extended variable radio source from my collections on Zooniverse

Coordinates:
282.253366334433 , -1.9079543352235002

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image and the "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786950 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786950 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 Almost all of the error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 7 mJy, excluding the outliers. The median flux is about 37.88 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 17, 2025 at 8:39 AM
davideiannone.bsky.social
Gradient analysis of galaxies in the Hubble fields

Coordinates:
0.10458656 , 31.014292

Data Credits: Hubble Space Telescope

Click the images for more

#astronomy
#hubblespacetelescope
#imageprocessing
Image enhanced by a colormap, to show the gradients with low intensity: the little-scale structures of the galactic disk Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: logarithmic Signal units: e-/s Signal range (histogram cut): 0.0676956 e-/s , 0.387074 e-/s Colormap: "sls inverted" Coordinates of the object: 0.10458656 , 31.014292 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/ Image enhanced by a colormap, to show the gradients with mean intensity: the large-scale structures of the galactic disk Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: logarithmic Signal units: e-/s Signal range (histogram cut): 0.0676956 e-/s , 0.387074 e-/s Colormap: "b inverted" Coordinates of the object: 0.10458656 , 31.014292 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/ Image enhanced by a colormap, to show the gradients with high intensity: the structure of the galactic core Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: linear Signal units: e-/s Signal range (histogram cut): 0.0676956 e-/s , 0.387074 e-/s Colormap: "sls inverted" Coordinates of the object: 0.10458656 , 31.014292 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/
March 16, 2025 at 9:14 PM
davideiannone.bsky.social
Gradient analysis of galaxies in the Hubble fields

Coordinates:
0.038007605 , 31.016747

Data Credits: Hubble Space Telescope

Click the images for more

#astronomy
#hubblespacetelescope
#imageprocessing
Image enhanced by a colormap, to show the gradients with low intensity: the little-scale structures of the galactic disk Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: logarithmic Signal units: e-/s Signal range (histogram cut): 0.0678952 e-/s , 1.16467 e-/s Colormap: "sls inverted" Coordinates of the object: 0.038007605 , 31.016747 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/ Image enhanced by a colormap, to show the gradients with mean intensity: the large-scale structures of the galactic disk Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: logarithmic Signal units: e-/s Signal range (histogram cut): 0.0678952 e-/s , 1.16467 e-/s Colormap: "b inverted" Coordinates of the object: 0.038007605 , 31.016747 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/ Image enhanced by a colormap, to show the gradients with high intensity: the structure of the galactic core Reference for the Hubble catalog: MAST - Barbara A. Mikulski Archive for Space Telescopes | Advanced Search https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Calibration level: 3 - scientific products Instrument_name: ACS/WFC Proposal_id: 13750 Proposal_type: GO Spectral band: optical Filter: F606W Coordinates of the Hubble field (center): 0.08883333333333 , 31.0225 Processed FITS file: hst_skycell-p1930x11y15_acs_wfc_f606w_all_drc.fits Angular scale: 1 pixel = 0.039987419 arcsec Signal scale: linear Signal units: e-/s Signal range (histogram cut): 0.0678952 e-/s , 1.16467 e-/s Colormap: "sls inverted" Coordinates of the object: 0.038007605 , 31.016747 Processing tool: DS9 - https://sites.google.com/cfa.harvard.edu/saoimageds9 Astronomical Data Center (search and download): ESASky web portal - https://sky.esa.int/esasky/
March 11, 2025 at 11:00 PM
davideiannone.bsky.social
Slow variable pointwise radio source from my collections on Zooniverse

Coordinates:
255.98314232289601 , -48.9322142975739

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785951 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785951 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 1.75 mJy, excluding the outliers. The median flux is about 3.65 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a distinctive falling phase between the epochs 58200 MJD - 59100 MJD, and a distinctive growing phase between the epochs 59100 MJD - 59500 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 10, 2025 at 10:25 PM
davideiannone.bsky.social
Fast variable pointwise radio source from my collections on Zooniverse

Coordinates:
271.028579750395 , -30.292980409227

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70789937 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70789937 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 7 mJy, excluding the outliers. The median flux is about 127.29 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 7, 2025 at 3:33 PM
davideiannone.bsky.social
Extended stable radio source from my collections on Zooniverse

Coordinates:
282.668605308895 , -1.05188460939925

Data Credits: Project "Bursts from Space: MeerKAT"

Click the image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786671 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786671 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The extension of the error bars, and the distribution of the dots in the light curve excluding the outliers, show a stable flux around 1.74 mJy. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 4, 2025 at 10:34 AM
davideiannone.bsky.social
Extended variable radio source from my collections on Zooniverse

Coordinates:
281.893001770605 , -1.2124758017438602

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image and the "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786852 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786852 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 100 mJy, excluding the outliers. The median flux is about 247.29 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
March 2, 2025 at 10:46 AM
davideiannone.bsky.social
Slow variable pointwise radio source from my collections on Zooniverse

Coordinates:
255.705545740399 , -48.789702987134106

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785898 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785898 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dynamic range in the flux density over the time. The variability amplitude is about 88 mJy, excluding the outliers. The median flux is about 2.5 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a distinctive primary peak between the epochs 58800 MJD - 59000 MJD, and a secondary peak between the epochs 59200 MJD - 59400 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 27, 2025 at 4:02 PM
davideiannone.bsky.social
Fast variable pointwise radio source from my collections on Zooniverse

Coordinates:
270.260001452238 , -30.3305615538372

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70789746 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70789746 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 Almost all of the error bars are smaller than the diameter of the dots, still showing a significative dynamic range in the flux density over the time. The variability amplitude is about 1.5 mJy, excluding the outliers. The median flux is about 17.84 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 24, 2025 at 9:54 AM
davideiannone.bsky.social
Extended stable radio source from my collections on Zooniverse

Coordinates:
281.938208155475 , -1.54068583705035

Data Credits: Project "Bursts from Space: MeerKAT"

Click the image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786642 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786642 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The extension of the error bars, and the distribution of the dots in the light curve excluding the outliers, show a stable flux around 3.59 mJy. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 17, 2025 at 9:10 PM
davideiannone.bsky.social
Extended variable radio source from my collections on Zooniverse

Coordinates:
282.186793269734 , -1.55368113008403

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image and the "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786788 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786788 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 Almost all of the error bars are smaller than the diameter of the dots, still showing a significative dynamic range in the flux density over the time. The variability amplitude is about 70.0 mJy, excluding the outliers. The median flux is about 251.2 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 16, 2025 at 9:28 PM
davideiannone.bsky.social
Slow variable pointwise radio source from my collections on Zooniverse

Coordinates:
255.291483221656 , -48.597428511111005

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785641 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785641 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dinamic range in the flux density over the time. The variability amplitude is about 2.0 mJy, excluding the outliers. The median flux is about 3.93 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a distinctive falling phase between the epochs 58600 MJD - 59100 MJD; a grow-up phase between the epochs 59100 MJD - 59300 MJD; a stable flux between the epochs 59300 MJD - 59550 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 15, 2025 at 9:15 PM
davideiannone.bsky.social
Fast variable pointwise radio source from my collections on Zooniverse

Coordinates:
288.7981366712588 , 10.945876405165802

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786128 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786128 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dinamic range in the flux density over the time. The variability amplitude is about 600.0 mJy, excluding the outliers. The median flux is about 36.95 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a distinctive peak close to the epoch 59050 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 14, 2025 at 5:09 PM
davideiannone.bsky.social
Extended stable radio source from my collections on Zooniverse

Coordinates:
281.910750144744 , -1.95976395887874

Data Credits: Project "Bursts from Space: MeerKAT"

Click the image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786641 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786641 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The extension of the error bars, and the distribution of the dots in the light curve excluding the outliers, show a stable flux around 111.52 mJy. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 12, 2025 at 10:51 PM
davideiannone.bsky.social
My contribute to the discovery of optical transients, as a volunteer for "Kilonova Seekers" Zooniverse project.

In some cases, a report to the TNS (Transient Name Server) was made including me and other volunteers.

goto-obs.github.io/knseekers-re...

#astronomy
#astrophysics
#zooniverse
Kilonova Seekers: https://www.zooniverse.org/projects/tkillestein/kilonova-seekers Subject Number: 91259701 Talk on the subject: https://www.zooniverse.org/projects/tkillestein/kilonova-seekers/talk/subjects/91259701 This was the first discovery of the project. Many others was made after this particular event (and more will come again!), with the help of many volunteers on Zooniverse. Particularly, the first peculiar dwarf nova detected by this project, submitted to "Astronomy and Astrophysics": https://arxiv.org/abs/2501.11524 where you can find the contribute of my Zooniverse friends. The page of results from the project: https://www.zooniverse.org/projects/tkillestein/kilonova-seekers/about/results Reference: https://doi.org/10.1093/mnras/stae1817
February 11, 2025 at 10:35 PM
davideiannone.bsky.social
Extended variable radio source from my collections on Zooniverse

Coordinates:
282.554247803287 , -1.6777046881321898

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image and the "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786779 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786779 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 Almost all of the error bars are smaller than the diameter of the dots, showing a significative dinamic range in the flux density over the time. The variability amplitude is about 7.0 mJy, excluding the outliers. The median flux is about 23.38 mJy. The subject has a good activity in the explored time window, for the available time resolution. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 10, 2025 at 10:56 PM
davideiannone.bsky.social
Slow variable pointwise radio source from my collections on Zooniverse

Coordinates:
255.156454737656 , -48.9462253003067

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785440 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785440 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are greater than the diameter of the dots, still showing a significative dinamic range in the flux density over the time. The variability amplitude is about 0.8 mJy, excluding the outliers. The median flux is about 1.70 mJy. The subject has a good activity in the explored time window, for the available time resolution, with a distinctive and symmetric peak between the epochs 58400 MJD - 58900 MJD, maximum at 58600 MJD, and an asymmetric peak between the epochs 58900 MJD - 59400 MJD. "MJD" stands for "Modified Julian Day": this is a time unit used by astronomers to refer to an event "zero", without having to calculate the days from the ordinary calendary. This is a uniform time reference.
February 9, 2025 at 10:44 PM
davideiannone.bsky.social
Fast variable pointwise radio source from my collections on Zooniverse

Coordinates:
255.977501889987 , -48.8668024550372

Data Credits: Project "Bursts from Space: MeerKAT"

Click radio image and "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785537 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785537 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dinamic range in the flux density over the time. The variability amplitude is about 1.75 mJy, excluding the outliers. The mean flux is about 1.5 mJy. The subject has a good activity in the explored time window, for the available time resolution.
February 8, 2025 at 10:32 PM
davideiannone.bsky.social
Extended stable radio source from my collections on Zooniverse

Coordinates:
255.928277829767 , -48.6129758577252

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image for more details

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70785698 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70785698 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). The orange blob at the left bottom is the PSF ("point spread function"), showing the shape of an ideal pointwise source as recorded by the radiotelescope taking in count the spatial resolution of the instrument, and the sky position of the object. Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The extension of the error bars, and the distribution of the dots in the light curve, show a stable flux around 2.0 mJy.
February 7, 2025 at 6:00 PM
davideiannone.bsky.social
Extended variable radio source from my collections on Zooniverse

Coordinates:
282.24305257276296 , -1.86023010874327

Data Credits: Project "Bursts from Space: MeerKAT"

Click the radio image and the "light curve" for more

#astronomy
#radioastronomy
#timedomainastronomy
#citizenscience
#zooniverse
Bursts from Space: MeerKAT https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat Subject Number: 70786690 Talk on the subject: https://www.zooniverse.org/projects/alex-andersson/bursts-from-space-meerkat/talk/subjects/70786690 The flux density from this astronomical object was expressed in milliJansky unit, by a color map (not real colors). Reference with my contribute as a citizen scientist: https://doi.org/10.1093/mnras/stad1298 The error bars are smaller than the diameter of the dots, showing a significative dinamic range in the flux density over the time. The variability amplitude is about 12 mJy, excluding the outliers. The subject has a good activity in the explored time window, for the available time resolution.
February 6, 2025 at 10:27 PM