Gideon van Buitenen
@vanbuitenen.nl
Amateur astronomer | Musician | Software developer
Author of http://astro.vanbuitenen.nl
Dutch Comet Section
MPC Observatory G06
Author of http://astro.vanbuitenen.nl
Dutch Comet Section
MPC Observatory G06
Na de ellende van vorig jaar ben ik dit jaar maar het land uit gevlucht. Wat er thuis in NL gebeurt is absurd. Wekenlang overlast door vuurwerk, om niet te spreken over doden, gewonden, zware branden, etc. Dit heeft niets met traditie te maken. Het is egocentrisch wangedrag. De jaarlijkse 'purge'.
January 1, 2026 at 1:54 PM
Na de ellende van vorig jaar ben ik dit jaar maar het land uit gevlucht. Wat er thuis in NL gebeurt is absurd. Wekenlang overlast door vuurwerk, om niet te spreken over doden, gewonden, zware branden, etc. Dit heeft niets met traditie te maken. Het is egocentrisch wangedrag. De jaarlijkse 'purge'.
Reposted by Gideon van Buitenen
"The fallacies behind the cult of Loeb"
New entry in my blog. Other articles have covered the scientific aspects; this one reflects on the social phenomenon. I argue it’s driven by a series of fallacies
tinieblasyestrellas.blogspot.com/2025/11/the-...
New entry in my blog. Other articles have covered the scientific aspects; this one reflects on the social phenomenon. I argue it’s driven by a series of fallacies
tinieblasyestrellas.blogspot.com/2025/11/the-...
The fallacies behind the cult of Loeb
How media hype and misunderstanding fuel pseudoscientific fascination Introduction The word “cult” is used here in the sense given by...
tinieblasyestrellas.blogspot.com
November 13, 2025 at 11:09 AM
"The fallacies behind the cult of Loeb"
New entry in my blog. Other articles have covered the scientific aspects; this one reflects on the social phenomenon. I argue it’s driven by a series of fallacies
tinieblasyestrellas.blogspot.com/2025/11/the-...
New entry in my blog. Other articles have covered the scientific aspects; this one reflects on the social phenomenon. I argue it’s driven by a series of fallacies
tinieblasyestrellas.blogspot.com/2025/11/the-...
Hi. Making videos is not my thing. Where did you see this? Was it really astrological or did you mean astronomical? I usually don't mind if people share my work, if they properly credit it and it the narrative is not complete nonsense (like astroloy).
November 10, 2025 at 8:28 AM
Hi. Making videos is not my thing. Where did you see this? Was it really astrological or did you mean astronomical? I usually don't mind if people share my work, if they properly credit it and it the narrative is not complete nonsense (like astroloy).
Top! Hier wil het maar niet lukken. Gistermiddag was ik even hoopvol maar rond zonsondergang trok het toch weer helemaal dicht. Toch even naar de polder gereden (want je weet maar nooit), maar helaas. Hopelijk vrijdag...?
October 23, 2025 at 8:40 AM
Top! Hier wil het maar niet lukken. Gistermiddag was ik even hoopvol maar rond zonsondergang trok het toch weer helemaal dicht. Toch even naar de polder gereden (want je weet maar nooit), maar helaas. Hopelijk vrijdag...?
Een indrukwekkend plaatje is het niet, maar het lukt al wel met een 8" RC vanuit Dordrecht.
July 27, 2025 at 10:34 AM
Een indrukwekkend plaatje is het niet, maar het lukt al wel met een 8" RC vanuit Dordrecht.
Reposted by Gideon van Buitenen
Finally! The paper is out!
Want to see a naked eye daylight comet? Mark your calendars for 2097! At least if the "ancestry line" given in the paper is correct. Sadly, I won't live to see it. Would I bet my money? I'd say yes.
www.sciengine.com/JAHH/doi/10....
☄️🔭 #CometWatch #histsci #histastro
Want to see a naked eye daylight comet? Mark your calendars for 2097! At least if the "ancestry line" given in the paper is correct. Sadly, I won't live to see it. Would I bet my money? I'd say yes.
www.sciengine.com/JAHH/doi/10....
☄️🔭 #CometWatch #histsci #histastro
April 28, 2025 at 5:51 AM
Finally! The paper is out!
Want to see a naked eye daylight comet? Mark your calendars for 2097! At least if the "ancestry line" given in the paper is correct. Sadly, I won't live to see it. Would I bet my money? I'd say yes.
www.sciengine.com/JAHH/doi/10....
☄️🔭 #CometWatch #histsci #histastro
Want to see a naked eye daylight comet? Mark your calendars for 2097! At least if the "ancestry line" given in the paper is correct. Sadly, I won't live to see it. Would I bet my money? I'd say yes.
www.sciengine.com/JAHH/doi/10....
☄️🔭 #CometWatch #histsci #histastro
Reposted by Gideon van Buitenen
Comet C/2025 F2 (SWAN) seems to be running out of steam. recent images show the comet becoming fainter despite nearing perihelion. It could still be an effect of the moon and low height but it is certain that the comet does not brighten.
🔭☄️ #CometWatch
🔭☄️ #CometWatch
C/2025 F2 (SWAN) this morning by Norbert Mrozek, Germany. Brightness stuck around 8.5 mag.
forum.vdsastro.de/viewtopic.ph...
🔭☄️ #CometWatch
forum.vdsastro.de/viewtopic.ph...
🔭☄️ #CometWatch
April 17, 2025 at 9:30 AM
Comet C/2025 F2 (SWAN) seems to be running out of steam. recent images show the comet becoming fainter despite nearing perihelion. It could still be an effect of the moon and low height but it is certain that the comet does not brighten.
🔭☄️ #CometWatch
🔭☄️ #CometWatch
Reposted by Gideon van Buitenen
Comet SWAN25F has been announced officially as C/2025 F2 (SWAN). CBET 5538 gives a timeline of the events & credit to all the amateurs who were crucial in discovery & confirmation it. I won't mention the MPEC which is a disgrace to all of us.
🔭☄️ #CometWatch
www.cbat.eps.harvard.edu/iau/cbet/005...
🔭☄️ #CometWatch
www.cbat.eps.harvard.edu/iau/cbet/005...
www.cbat.eps.harvard.edu
April 9, 2025 at 5:14 AM
Comet SWAN25F has been announced officially as C/2025 F2 (SWAN). CBET 5538 gives a timeline of the events & credit to all the amateurs who were crucial in discovery & confirmation it. I won't mention the MPEC which is a disgrace to all of us.
🔭☄️ #CometWatch
www.cbat.eps.harvard.edu/iau/cbet/005...
🔭☄️ #CometWatch
www.cbat.eps.harvard.edu/iau/cbet/005...
The bright new #comet temporarily named SWAN25F has now been formally designated C/2025 F2 (SWAN)
The orbit is perpendicular to the ecliptic (i=90.4°) from north to south. Perihelion will occur on May 1 at 0.33 au from the sun.
See MPEC 2025-G102 and astro.vanbuitenen.nl/comet/2025F2
#CometWatch
The orbit is perpendicular to the ecliptic (i=90.4°) from north to south. Perihelion will occur on May 1 at 0.33 au from the sun.
See MPEC 2025-G102 and astro.vanbuitenen.nl/comet/2025F2
#CometWatch
April 9, 2025 at 5:48 AM
The bright new #comet temporarily named SWAN25F has now been formally designated C/2025 F2 (SWAN)
The orbit is perpendicular to the ecliptic (i=90.4°) from north to south. Perihelion will occur on May 1 at 0.33 au from the sun.
See MPEC 2025-G102 and astro.vanbuitenen.nl/comet/2025F2
#CometWatch
The orbit is perpendicular to the ecliptic (i=90.4°) from north to south. Perihelion will occur on May 1 at 0.33 au from the sun.
See MPEC 2025-G102 and astro.vanbuitenen.nl/comet/2025F2
#CometWatch
Ja, want de veiligheid gaat er natuurlijk fors op vooruit als overal landmijnen liggen. Dieptriest.
March 18, 2025 at 9:34 AM
Ja, want de veiligheid gaat er natuurlijk fors op vooruit als overal landmijnen liggen. Dieptriest.
Is zo'n extra-parlementair kabinet, waarbij je net doet alsof je het op hoofdlijnen wel eens zou zijn, eigenlijk wel iets dat kan vallen? Ik krijg de indruk dat als de modus operandi onenigheid is, je heel erg lang aan kan blijven modderen.
March 13, 2025 at 12:51 PM
Is zo'n extra-parlementair kabinet, waarbij je net doet alsof je het op hoofdlijnen wel eens zou zijn, eigenlijk wel iets dat kan vallen? Ik krijg de indruk dat als de modus operandi onenigheid is, je heel erg lang aan kan blijven modderen.
Wimpers. Ook woke.
March 11, 2025 at 10:06 AM
Wimpers. Ook woke.
Inderdaad. Het extraparlementaire experiment, enkel bedoeld om een extremistische minderheid in het zadel te hijsen, is gewoon mislukt.
March 7, 2025 at 10:41 AM
Inderdaad. Het extraparlementaire experiment, enkel bedoeld om een extremistische minderheid in het zadel te hijsen, is gewoon mislukt.
New, but faint #comet confirmed: C/2025 D5 (PANSTARRS)
It will reach perihelion in May of this year at 2 au from the sun.
See MPEC 2025-E99 and astro.vanbuitenen.nl/comet/2025D5
#CometWatch
It will reach perihelion in May of this year at 2 au from the sun.
See MPEC 2025-E99 and astro.vanbuitenen.nl/comet/2025D5
#CometWatch
March 6, 2025 at 7:26 AM
New, but faint #comet confirmed: C/2025 D5 (PANSTARRS)
It will reach perihelion in May of this year at 2 au from the sun.
See MPEC 2025-E99 and astro.vanbuitenen.nl/comet/2025D5
#CometWatch
It will reach perihelion in May of this year at 2 au from the sun.
See MPEC 2025-E99 and astro.vanbuitenen.nl/comet/2025D5
#CometWatch
New #comet confirmed: C/2025 E1 (PANSTARRS)
Perihelion will occur in September of 2026 at 4 au from the sun.
See MPEC 2025-E58 and astro.vanbuitenen.nl/comet/2025E1
#CometWatch
Perihelion will occur in September of 2026 at 4 au from the sun.
See MPEC 2025-E58 and astro.vanbuitenen.nl/comet/2025E1
#CometWatch
March 4, 2025 at 2:04 PM
New #comet confirmed: C/2025 E1 (PANSTARRS)
Perihelion will occur in September of 2026 at 4 au from the sun.
See MPEC 2025-E58 and astro.vanbuitenen.nl/comet/2025E1
#CometWatch
Perihelion will occur in September of 2026 at 4 au from the sun.
See MPEC 2025-E58 and astro.vanbuitenen.nl/comet/2025E1
#CometWatch
Het enige waar hij goed in is, is zichzelf de eer en verdiensten van andermans werk toe-eigenen. Hij is een ordinaire dief.
February 28, 2025 at 7:28 PM
Het enige waar hij goed in is, is zichzelf de eer en verdiensten van andermans werk toe-eigenen. Hij is een ordinaire dief.
New periodic #comet confirmed: P/2025 D4 (ATLAS)
Perihelion was on Feb 14. It currently has an orbital period of 26.6 years.
See MPEC 2025-D235 and astro.vanbuitenen.nl/comet/2025D4
#CometWatch
Perihelion was on Feb 14. It currently has an orbital period of 26.6 years.
See MPEC 2025-D235 and astro.vanbuitenen.nl/comet/2025D4
#CometWatch
February 28, 2025 at 10:23 AM
New periodic #comet confirmed: P/2025 D4 (ATLAS)
Perihelion was on Feb 14. It currently has an orbital period of 26.6 years.
See MPEC 2025-D235 and astro.vanbuitenen.nl/comet/2025D4
#CometWatch
Perihelion was on Feb 14. It currently has an orbital period of 26.6 years.
See MPEC 2025-D235 and astro.vanbuitenen.nl/comet/2025D4
#CometWatch
P/2025 D3 (PANSTARRS) approached Jupiter to 0.6 au by the end of 2021, reducing its orbital period by a year, and its perihelion distance by 0.47 au.
February 27, 2025 at 1:23 PM
P/2025 D3 (PANSTARRS) approached Jupiter to 0.6 au by the end of 2021, reducing its orbital period by a year, and its perihelion distance by 0.47 au.
New Jupiter-family #comet confirmed.
It has an orbital period of 7.9 years. Last perihelion occurred in July of 2024.
See MPEC 2025-D211 and astro.vanbuitenen.nl/comet/2025D3
#CometWatch
It has an orbital period of 7.9 years. Last perihelion occurred in July of 2024.
See MPEC 2025-D211 and astro.vanbuitenen.nl/comet/2025D3
#CometWatch
February 27, 2025 at 1:08 PM
New Jupiter-family #comet confirmed.
It has an orbital period of 7.9 years. Last perihelion occurred in July of 2024.
See MPEC 2025-D211 and astro.vanbuitenen.nl/comet/2025D3
#CometWatch
It has an orbital period of 7.9 years. Last perihelion occurred in July of 2024.
See MPEC 2025-D211 and astro.vanbuitenen.nl/comet/2025D3
#CometWatch
New object on a cometary orbit confirmed: A/2025 A7
It is on a retrograde (i=134°) orbit, reaching perihelion on March 28 at 2.9 au from the sun.
See MPEC 2025-D151 and astro.vanbuitenen.nl/comet/2025A7
#CometWatch
It is on a retrograde (i=134°) orbit, reaching perihelion on March 28 at 2.9 au from the sun.
See MPEC 2025-D151 and astro.vanbuitenen.nl/comet/2025A7
#CometWatch
February 25, 2025 at 9:20 AM
New object on a cometary orbit confirmed: A/2025 A7
It is on a retrograde (i=134°) orbit, reaching perihelion on March 28 at 2.9 au from the sun.
See MPEC 2025-D151 and astro.vanbuitenen.nl/comet/2025A7
#CometWatch
It is on a retrograde (i=134°) orbit, reaching perihelion on March 28 at 2.9 au from the sun.
See MPEC 2025-D151 and astro.vanbuitenen.nl/comet/2025A7
#CometWatch
New periodic #comet confirmed: P/2025 D2 (PANSTARRS)
The current orbital elements (based on 13 observations dating back to Feb 4) give perihelion in Jan 2028 at 7.2 au from the sun, and a 29.7 year orbital period.
See MPEC 2025-D149 and astro.vanbuitenen.nl/comet/2025D2
#CometWatch
The current orbital elements (based on 13 observations dating back to Feb 4) give perihelion in Jan 2028 at 7.2 au from the sun, and a 29.7 year orbital period.
See MPEC 2025-D149 and astro.vanbuitenen.nl/comet/2025D2
#CometWatch
February 25, 2025 at 9:11 AM
New periodic #comet confirmed: P/2025 D2 (PANSTARRS)
The current orbital elements (based on 13 observations dating back to Feb 4) give perihelion in Jan 2028 at 7.2 au from the sun, and a 29.7 year orbital period.
See MPEC 2025-D149 and astro.vanbuitenen.nl/comet/2025D2
#CometWatch
The current orbital elements (based on 13 observations dating back to Feb 4) give perihelion in Jan 2028 at 7.2 au from the sun, and a 29.7 year orbital period.
See MPEC 2025-D149 and astro.vanbuitenen.nl/comet/2025D2
#CometWatch
New, distant #comet confirmed:
C/2025 D1 (Groeller)
The comet is on a highly inclined orbit, reaching perihelion in May 2028 at a record distance of 14.1 au from the sun!
Pre-discovery observations are dating back to June 2018.
See MPEC 2025-D83 and astro.vanbuitenen.nl/comet/2025D1
#CometWatch
C/2025 D1 (Groeller)
The comet is on a highly inclined orbit, reaching perihelion in May 2028 at a record distance of 14.1 au from the sun!
Pre-discovery observations are dating back to June 2018.
See MPEC 2025-D83 and astro.vanbuitenen.nl/comet/2025D1
#CometWatch
February 24, 2025 at 9:06 AM
New, distant #comet confirmed:
C/2025 D1 (Groeller)
The comet is on a highly inclined orbit, reaching perihelion in May 2028 at a record distance of 14.1 au from the sun!
Pre-discovery observations are dating back to June 2018.
See MPEC 2025-D83 and astro.vanbuitenen.nl/comet/2025D1
#CometWatch
C/2025 D1 (Groeller)
The comet is on a highly inclined orbit, reaching perihelion in May 2028 at a record distance of 14.1 au from the sun!
Pre-discovery observations are dating back to June 2018.
See MPEC 2025-D83 and astro.vanbuitenen.nl/comet/2025D1
#CometWatch
New returning #comet confirmed:
C/2025 A6 (Lemmon)
It approaches on a retrograde orbit and may reach mag 10 in October of this year. Perihelion occurs in November. The current orbital elements imply a ~1386 year orbital period.
See MPEC 2025-D55 and astro.vanbuitenen.nl/comet/2025A6
#CometWatch
C/2025 A6 (Lemmon)
It approaches on a retrograde orbit and may reach mag 10 in October of this year. Perihelion occurs in November. The current orbital elements imply a ~1386 year orbital period.
See MPEC 2025-D55 and astro.vanbuitenen.nl/comet/2025A6
#CometWatch
February 24, 2025 at 8:55 AM
New returning #comet confirmed:
C/2025 A6 (Lemmon)
It approaches on a retrograde orbit and may reach mag 10 in October of this year. Perihelion occurs in November. The current orbital elements imply a ~1386 year orbital period.
See MPEC 2025-D55 and astro.vanbuitenen.nl/comet/2025A6
#CometWatch
C/2025 A6 (Lemmon)
It approaches on a retrograde orbit and may reach mag 10 in October of this year. Perihelion occurs in November. The current orbital elements imply a ~1386 year orbital period.
See MPEC 2025-D55 and astro.vanbuitenen.nl/comet/2025A6
#CometWatch