Esther Hanko
@oetie.nl
Glamateurastronoom 💅 | Moestuinmiep | Outreachcoördinator @uva_api
| Raar kattenvrouwtje | @estherhanko@scholar.social | blog: oetie.nl
| Raar kattenvrouwtje | @estherhanko@scholar.social | blog: oetie.nl
Pinned
Esther Hanko
@oetie.nl
· Nov 30
Foto van Jupiter van gisteravond vanuit de voortuin in Purmerend. 🔭📷
Reposted by Esther Hanko
7 5 0, 0 0 0 proposed satellites in LEO
#envhist of space
space-based #LightPollution
And, of course, a chapter in my book soon to be proof stage is already out of date...
#envhist of space
space-based #LightPollution
And, of course, a chapter in my book soon to be proof stage is already out of date...
I've updated my megaconstellations list www.planet4589.org/space/con/co... with details of the planned Blue Origin Terawave system and the enormous CTC1 and CTC2 constellations China just filed with the ITU, for a total of almost 750,000 proposed satellites in the years to come.
Jonathan's Space Report | Space Statistics
Jonathan McDowell's new homepage
www.planet4589.org
January 26, 2026 at 1:02 PM
7 5 0, 0 0 0 proposed satellites in LEO
#envhist of space
space-based #LightPollution
And, of course, a chapter in my book soon to be proof stage is already out of date...
#envhist of space
space-based #LightPollution
And, of course, a chapter in my book soon to be proof stage is already out of date...
Reposted by Esther Hanko
En we zijn begonnen. Online tour van de ATLAS detector op CERN. www.youtube.com/@Nikhef
Nikhef
Nikhef is het Nationaal instituut voor subatomaire fysica en is gevestigd op Amsterdam Science Park.
www.youtube.com
January 26, 2026 at 12:35 PM
En we zijn begonnen. Online tour van de ATLAS detector op CERN. www.youtube.com/@Nikhef
Reposted by Esther Hanko
Voilà ma dernière image de Jupiter prise ce WE depuis mon balcon à Paris. Et maintenant place aux nuages, ... :(
January 26, 2026 at 10:06 AM
Voilà ma dernière image de Jupiter prise ce WE depuis mon balcon à Paris. Et maintenant place aux nuages, ... :(
Reposted by Esther Hanko
News of plans for *another* mega constellation yesterday. Amateur astronomers: get out there & look at the stars any chance you get, no matter how tired you are, because the night sky we love will be gone soon, hidden behind a wall of billionaires' WiFi routers.
January 22, 2026 at 7:39 AM
News of plans for *another* mega constellation yesterday. Amateur astronomers: get out there & look at the stars any chance you get, no matter how tired you are, because the night sky we love will be gone soon, hidden behind a wall of billionaires' WiFi routers.
Reposted by Esther Hanko
Attn news commentators: Trump saying he could use force to obtain Greenland but won’t is not Trump saying he won’t use force to obtain Greenland. It is Trump using force as a threat to obtain Greenland. That is why he mentions it.
January 21, 2026 at 2:16 PM
Attn news commentators: Trump saying he could use force to obtain Greenland but won’t is not Trump saying he won’t use force to obtain Greenland. It is Trump using force as a threat to obtain Greenland. That is why he mentions it.
Reposted by Esther Hanko
Dit is Gidi Markuszower.
De man die expliciet opriep om Tweede Kamerleden te berechten in tribunalen.
Het is ontluisterend dat D66 überhaupt overweegt om deals met hem te sluiten.
Deze tijd vraagt om verzet tegen extreem-rechts, ook als je op zoek bent naar steun voor je minderheidskabinet.
De man die expliciet opriep om Tweede Kamerleden te berechten in tribunalen.
Het is ontluisterend dat D66 überhaupt overweegt om deals met hem te sluiten.
Deze tijd vraagt om verzet tegen extreem-rechts, ook als je op zoek bent naar steun voor je minderheidskabinet.
January 21, 2026 at 8:23 AM
Dit is Gidi Markuszower.
De man die expliciet opriep om Tweede Kamerleden te berechten in tribunalen.
Het is ontluisterend dat D66 überhaupt overweegt om deals met hem te sluiten.
Deze tijd vraagt om verzet tegen extreem-rechts, ook als je op zoek bent naar steun voor je minderheidskabinet.
De man die expliciet opriep om Tweede Kamerleden te berechten in tribunalen.
Het is ontluisterend dat D66 überhaupt overweegt om deals met hem te sluiten.
Deze tijd vraagt om verzet tegen extreem-rechts, ook als je op zoek bent naar steun voor je minderheidskabinet.
Reposted by Esther Hanko
Great aurora visible in Dwingeloo yesterday!
January 20, 2026 at 10:08 AM
Great aurora visible in Dwingeloo yesterday!
Hier nog wat kiekjes van het #noorderlicht van gisteren, op de Purmerringdijk in Purmerend.
Vanavond weer? Ik verwacht van niet, maar ik ben wel mijn sd-kaarten aan het leegtrekken en de batterijen aan het opladen ;)
Vanavond weer? Ik verwacht van niet, maar ik ben wel mijn sd-kaarten aan het leegtrekken en de batterijen aan het opladen ;)
January 20, 2026 at 9:52 AM
Hier nog wat kiekjes van het #noorderlicht van gisteren, op de Purmerringdijk in Purmerend.
Vanavond weer? Ik verwacht van niet, maar ik ben wel mijn sd-kaarten aan het leegtrekken en de batterijen aan het opladen ;)
Vanavond weer? Ik verwacht van niet, maar ik ben wel mijn sd-kaarten aan het leegtrekken en de batterijen aan het opladen ;)
Gisteren gemist en/of wil je meer van dat? In dit blogje leg ik uit hoe je zelf kunt beoordelen of er #noorderlicht op komst is:
www.oetie.nl/astronomie/z...
www.oetie.nl/astronomie/z...
Zelf noorderlicht zien in Nederland - Oetie.nl %
Zelf poollicht zien in Nederland? Het kan! Ik leg hier kort uit hoe je zelf kunt zien of de condities voor poollicht in Nederland goed zijn.
www.oetie.nl
January 20, 2026 at 8:21 AM
Gisteren gemist en/of wil je meer van dat? In dit blogje leg ik uit hoe je zelf kunt beoordelen of er #noorderlicht op komst is:
www.oetie.nl/astronomie/z...
www.oetie.nl/astronomie/z...
Reposted by Esther Hanko
An absolutely awesome display of Northern Lights over the Netherlands during the past hour! Red glow in the North and a green curtain passing over whose motion was very obvious with the naked eye. This is 1 hour worth of 15 second exposures with my all sky camera from 21to 22UTC. #auroraBorealis
January 19, 2026 at 10:27 PM
An absolutely awesome display of Northern Lights over the Netherlands during the past hour! Red glow in the North and a green curtain passing over whose motion was very obvious with the naked eye. This is 1 hour worth of 15 second exposures with my all sky camera from 21to 22UTC. #auroraBorealis
Reposted by Esther Hanko
Fantastic #aurora tonight. Even from my city garden at 52.25 north you could see fast moving green bands and red clouds with the unaided eye. @leonoor.bsky.social @waddensky.nl @petervogel.bsky.social @tamithaskov.bsky.social
January 19, 2026 at 11:26 PM
Fantastic #aurora tonight. Even from my city garden at 52.25 north you could see fast moving green bands and red clouds with the unaided eye. @leonoor.bsky.social @waddensky.nl @petervogel.bsky.social @tamithaskov.bsky.social
Aaaaaa noorderlicht in de achtertuin in Purmerend aaaaaaa
January 19, 2026 at 8:59 PM
Aaaaaa noorderlicht in de achtertuin in Purmerend aaaaaaa
Reposted by Esther Hanko
Faint, red aurora is already appearing on the northern horizon as seen from Germany. Views will probably strengthen over the next 1-2 hours.
theauroraguy.com/pages/webcams
theauroraguy.com/pages/webcams
January 19, 2026 at 8:07 PM
Faint, red aurora is already appearing on the northern horizon as seen from Germany. Views will probably strengthen over the next 1-2 hours.
theauroraguy.com/pages/webcams
theauroraguy.com/pages/webcams
Reposted by Esther Hanko
Reposted by Esther Hanko
Latest NASA CME model: CME may be FASTER than originally anticipated. Impact is slated for Jan 20 around 1 UT--it's a very fast CME and could deliver strong geomagnetic storming Monday night with auroras visible across mid-latitudes. We'll see what happens over the next 24 hr!
#heliophysics
#heliophysics
January 19, 2026 at 7:19 AM
Latest NASA CME model: CME may be FASTER than originally anticipated. Impact is slated for Jan 20 around 1 UT--it's a very fast CME and could deliver strong geomagnetic storming Monday night with auroras visible across mid-latitudes. We'll see what happens over the next 24 hr!
#heliophysics
#heliophysics
Reposted by Esther Hanko
X marks the spot—💥☀️ kaboom! Sunspot region AR4341 just unleashed a powerful X1.95 flare, instantly boosting solar activity to high levels🚀. It’s still too early to say for sure, but early imagery hints at a possible coronal mass ejection (CME) 🌬️ headed outward. Stay tuned! 👀✨
bit.ly/sunactivity
bit.ly/sunactivity
January 18, 2026 at 7:01 PM
X marks the spot—💥☀️ kaboom! Sunspot region AR4341 just unleashed a powerful X1.95 flare, instantly boosting solar activity to high levels🚀. It’s still too early to say for sure, but early imagery hints at a possible coronal mass ejection (CME) 🌬️ headed outward. Stay tuned! 👀✨
bit.ly/sunactivity
bit.ly/sunactivity
Reposted by Esther Hanko
A FULL-HALO CME is emerging in coronagraph imagery. The CME looks to be biased a bit to the east of Earth, but the shock front may clip us. The CME is not *directly* aimed at Earth, but we may receive a glancing blow. Now we wait for model releases and arrival time predictions...
January 18, 2026 at 7:27 PM
A FULL-HALO CME is emerging in coronagraph imagery. The CME looks to be biased a bit to the east of Earth, but the shock front may clip us. The CME is not *directly* aimed at Earth, but we may receive a glancing blow. Now we wait for model releases and arrival time predictions...
Reposted by Esther Hanko
Een groep wetenschappers, opiniemakers en organisaties eist duidelijkheid over de Amerikaanse overname van Solvinity, het bedrijf achter DigiD. Economische Zaken onderzoekt de overname momenteel, maar wil er niets over zeggen. Juridisch vuurwerk dreigt.
www.ftm.nl/artikelen/pr...
www.ftm.nl/artikelen/pr...
Prominenten komen in actie tegen Amerikaanse overname van DigiD-leverancier
Een groep wetenschappers, opiniemakers en organisaties eist duidelijkheid over de Amerikaanse overname van Solvinity, het bedrijf achter DigiD. Economische Zaken onderzoekt of de nationale veiligheid ...
www.ftm.nl
January 15, 2026 at 9:18 AM
Een groep wetenschappers, opiniemakers en organisaties eist duidelijkheid over de Amerikaanse overname van Solvinity, het bedrijf achter DigiD. Economische Zaken onderzoekt de overname momenteel, maar wil er niets over zeggen. Juridisch vuurwerk dreigt.
www.ftm.nl/artikelen/pr...
www.ftm.nl/artikelen/pr...
Reposted by Esther Hanko
Astronomer Elisabetha Hevelius was born 379 years ago today. She married astronomer Johannes Hevelius at 16, and after his death it was she who published the Prodromus Astronomiae in 1690, a rigorously computed collection of 1564 star positions.
#WomenInSTEM #AstroSky 🧪🔭
#WomenInSTEM #AstroSky 🧪🔭
January 17, 2026 at 5:30 PM
Astronomer Elisabetha Hevelius was born 379 years ago today. She married astronomer Johannes Hevelius at 16, and after his death it was she who published the Prodromus Astronomiae in 1690, a rigorously computed collection of 1564 star positions.
#WomenInSTEM #AstroSky 🧪🔭
#WomenInSTEM #AstroSky 🧪🔭
Reposted by Esther Hanko
Ik kan gewoon niet meer - net gehoord dat een van de grootste verwerkers van privégegevens binnen de overheid druk bezig is met zijn totale migratie naar Microsoft Azure. En de mensen die het tegen zouden kunnen houden worden buitengesloten & hebben het opgegeven. Stukje: berthub.eu/articles/pos...
January 16, 2026 at 7:57 AM
Ik kan gewoon niet meer - net gehoord dat een van de grootste verwerkers van privégegevens binnen de overheid druk bezig is met zijn totale migratie naar Microsoft Azure. En de mensen die het tegen zouden kunnen houden worden buitengesloten & hebben het opgegeven. Stukje: berthub.eu/articles/pos...
Reposted by Esther Hanko
Did you know that there is a lunar crater named after Anton Pannekoek? It's at the far side of the moon so we can't see it through a telescope from earth. This photo was taken by the Lunar Reconnaisance Orbiter. What's your favourite lunar feature? 🌔🔭
January 8, 2026 at 9:55 AM
Did you know that there is a lunar crater named after Anton Pannekoek? It's at the far side of the moon so we can't see it through a telescope from earth. This photo was taken by the Lunar Reconnaisance Orbiter. What's your favourite lunar feature? 🌔🔭
Bijzondere kleurkeuze.
Is it your duty towards society to have children? Clear geographical patterns here.
January 7, 2026 at 2:36 PM
Bijzondere kleurkeuze.
Reposted by Esther Hanko
#OnThisDay in 1610, Galileo Galilei recorded the first mention of Jupiter's moons. At first thinking them to be fixed stars near the gas giant, his later observations revealed them to be orbiting Jupiter. Io, Europa, Ganymede and Callisto are now known as the Galilean moons. #HistoryOfScience
January 7, 2026 at 10:35 AM
#OnThisDay in 1610, Galileo Galilei recorded the first mention of Jupiter's moons. At first thinking them to be fixed stars near the gas giant, his later observations revealed them to be orbiting Jupiter. Io, Europa, Ganymede and Callisto are now known as the Galilean moons. #HistoryOfScience
Reposted by Esther Hanko
Work! Our lovely institute (@api.uva.nl) is looking for a new Institute Manager - so if you fancy trying to make sense of the mysteries of university project budgets, and herding a bunch of mostly well-behaved astronomer-cats, JOIN US!!!
werkenbij.uva.nl/vacatures/in...
werkenbij.uva.nl/vacatures/in...
Vacature — Instituutsmanager Anton Pannekoek Instituut voor Sterrenkunde
<p>Voel jij je thuis in de universitaire wereld en houd je van uitdagingen op het gebied van bedrijfsvoering? Wie weet ben jij dan onze nieuwe instituutsmanager!</p>
werkenbij.uva.nl
December 18, 2025 at 10:19 AM
Work! Our lovely institute (@api.uva.nl) is looking for a new Institute Manager - so if you fancy trying to make sense of the mysteries of university project budgets, and herding a bunch of mostly well-behaved astronomer-cats, JOIN US!!!
werkenbij.uva.nl/vacatures/in...
werkenbij.uva.nl/vacatures/in...
Reposted by Esther Hanko
We're hiring! The GRAPPA center (a collaboration between the UvA's IoP and API) is looking for an assistant/associate professor in the area of gravitational-wave and multi-messenger astrophysics. Please see below for full vacancy.
werkenbij.uva.nl/en/vacancies...
werkenbij.uva.nl/en/vacancies...
Vacancy — Faculty position in GRAPPA Center of Excellence
<p>Do you enjoy working in an interdisciplinary research setting and do you want to be active in the area of gravitational-wave and multi-messenger astrophysics? The Gravitation and Astroparticle Physics Amsterdam (<a href="https://www.grappa.amsterdam/">GRAPPA</a>) Centre of Excellence at The University of Amsterdam is seeking to hire one assistant/associate professor. We are especially interested in candidates that can strengthen our connection to current and future gravitational-wave, neutrino, and electromagnetic observatories. We have a strong preference for a staff member who enhances the diversity of our staff and will prioritize applicants from members of underrepresented groups.</p>
werkenbij.uva.nl
January 7, 2026 at 11:07 AM
We're hiring! The GRAPPA center (a collaboration between the UvA's IoP and API) is looking for an assistant/associate professor in the area of gravitational-wave and multi-messenger astrophysics. Please see below for full vacancy.
werkenbij.uva.nl/en/vacancies...
werkenbij.uva.nl/en/vacancies...