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"A newly discovered green comet tracked by telescopes has likely broken apart as it swung by the sun, dashing hopes of a naked-eye spectacle."
@AssociatedPress reports on Comet SWAN: https://flip.it/XrOqU4
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APOD from 2006-10-28
#Comet SWAN Outburst
Comet SWAN (C/2006 M4) became a naked-eye object as it neared Earth, with changes in its coma and tail captured in an 8-minute exposure. Still visible with binoculars near Hercules in the NW evening sky, despite increasing moonlight.
HD image at https://apod.nasa.gov/apod/ap061028.html
Boo, I had been waiting for Comet C/2025 F2 (Swan) to come into the evening sky in late April; on 1st May it was going to be near the Pleiades and I thought it could make a nice picture.
But sadly from the reports on the comets-ml mailing list over the last few days it appears this is very its last time around the sun (period ~30k-80k years); it looks very much like its nucleus has disintegrated. 
#comet #astronomy
APOD from 2025-04-18
#Comet C/2025 F2 SWAN
Comet C/2025 F2 SWAN, discovered by citizen scientists using SOHO's SWAN camera, shows a greenish coma and faint ion tail in an image from California. Currently visible with binoculars, it will reach perihelion on May 1 near #Mercury's orbit.
HD image at https://apod.nasa.gov/apod/ap250418.html#space #astronomy #planet
Trochę nieprzytomny, po dwóch kawach i kakao, wrzuciłem rawy do Sirila, GraXperta a na koniec do PixInsight i coś tam wyszło.
Muszę iść się przewietrzyć na 
Trochę zarwana noc, ale kometa C/2025 F2 (SWAN) upolowana (jeszcze się „smaży“).
Obróbka - tylko Lightroom na tablecie.
APOD from 2023-01-09
Tails of #Comet ZTF
Comet ZTF, discovered last year, is brightening and may soon be visible without binoculars. Its closest approach to the Sun could reveal its three blue ion tails and green glowing coma to northern skywatchers with clear skies. However, comet brightness predictions are uncertain. After nearing Earth in early February, it's expected to fade.
HD image at https://apod.nasa.gov/apod/ap230109.html
New comet discovered that is already an easy object in amateur telescopes, and should brighten for the next 3 - 4 weeks. Get your binoculars and cameras ready.
C/2025 F2 (SWAN)
Currently in the morning sky and will transition to the evening sky in late April. (See screenshots for more info and finder charts.)
https://skyandtelescope.org/astronomy-news/new-comet-swan-now-visible-in-small-scopes/
Discussione continua
The visibility conditions for comet C/2025 F2 (SWAN) through perihelion and maximum brightness for 51.5° North - see https://www.facebook.com/dan.fischer.393/posts/pfbid023poyxvFZYhxPsT18sxHZejFPYYGiXdeApa3dj78oPqmnw8QRLH22dVFCABnLk93Zl for explanations of the table! In a nutshell, in Central Europe the comet is higher at a given degree of sky darkness in the morning until about 23 April, then in the evening. So expect it at 3 to 5 mag. low at dusk: if the #comet makes it and keeps its fine tail this *may* become a fine nightscape photo opp - but not a significant show for the naked eye.
New comet in the sky
#Astronomy #Comet #Science
https://www.cbc.ca/news/science/comet-swan25f-1.7503849
CBCThere's a new comet in the sky, and it's already visible through binoculars | CBC NewsOne of the great things about astronomy is that it’s always full of surprises, especially when it comes to comets — you just can’t predict new ones. But there’s a lot of buzz around a recently discovered comet that has quickly brightened.
A comet 
has been discovered, temporarily named SWAN25F and it is visible to the east before sunrise.
https://www.cbc.ca/news/science/comet-swan25f-1.7503849
- - -
Une comète a été découverte, nommée temporairement SWAN25F et elle est visible à l’est avant l’aube.
https://blogs.futura-sciences.com/feldmann/2025/04/09/swan25f-une-comete-pour-les-leve-tot/
CBCThere's a new comet in the sky, and it's already visible through binoculars | CBC NewsOne of the great things about astronomy is that it’s always full of surprises, especially when it comes to comets — you just can’t predict new ones. But there’s a lot of buzz around a recently discovered comet that has quickly brightened.
There's a new comet in the sky, and it's already visible through binoculars
One of the great things about astronomy is that it’s always full of surprises, especially when it comes to comets — you just can’t predict new ones. But there’s a lot of buzz around a recently discovered comet that has quickly brightened.
#astronomy #science #space #comet #News
https://www.cbc.ca/news/science/comet-swan25f-1.7503849?cmp=rss
Here #comet #SWAN25F images taken today early morning 8th April from my remote observatory at Spain. SWAN25F is quite low in the morning sky near Pegasus square upper area between stars Alpheratz and Scheat. It's magnitude is about 9, tail visible almost one degree toward PA 300deg and coma diameter is 5'. Animation 18x30sec in the link below shows also moving tail details.
More info here https://www.taivaanvahti.fi/observations/show/133765
Here #comet #SWAN25F images taken today early morning 8th April from my remote observatory at Spain. SWAN25F is quite low in the morning sky near Pegasus square upper area between stars Alpheratz and Scheat. It's magnitude is about 9, tail visible almost one degree toward PA 300deg and coma diameter is 5'. Animation 18x30sec in the link below shows also moving tail details.
More info here https://www.taivaanvahti.fi/observations/show/133765
Looks like new #comet #SWAN25F is not going to get any above the E horizon before dawn. This is a projected track for the next month using Stellarium & orbital elements from Project Pluto's "Pseudo-MPEC" (https://www.projectpluto.com/swan.htm) View is at start of astronomical twilight.
A new #comet, #SWAN25F is brightening in the pre-dawn sky. Catch it moving through constellations such as Pegasus and Andromeda. As of early April, Comet SWAN25F has brightened to approximately magnitude 8.0, making it observable with binoculars with great conditions. https://ow.ly/BBPH50VvPTT
Discussione continua
Here is another outstanding image of comet SWAN25F and its bright bluish-green coma, taken last night by 喜闻乐见小绿人 @xwlj_XLR and posted on twitter -
"Comet SWAN25F
D=203mm f/5 60s*44
AstroMamenchi Remote Observatory
2025-04-07
Despite the bad weather, the tail became even longer, extending out of the frame!
4:03 AM · Apr 7, 2025."
Time zone = UTC+8, China.
喜闻乐见小绿人 = Xǐwénlèjiàn xiǎo lǜ rén, The Little Green Man.
Credit: 喜闻乐见小绿人
#Comet
6/n
Discussione continua
The green color seen in the coma of many comets such as SWAN25F, but not in their tails, is due to emissions from Diatomic carbon C2 molecules.
Sunlight heats the comet’s ice and organic material to produce quadruple bond C2 molecules, which break apart in ~2 days before they reach the tail. C2 is excited by solar UV radiation and emits mostly in infrared but its triplet state radiates at 518 nm (d3Πg → a3Πu transition below).
https://physicstoday.scitation.org/do/10.1063/pt.6.1.20220110a/full/
https://www.pnas.org/doi/10.1073/pnas.2113315118
#comet
4/n
APOD from 2021-10-22
A #Comet and a Crab
Spanning over 2 degrees in Taurus, this image features the Crab Nebula (M1) and comet 67P. M1 is a Messier catalog non-comet; 67P, known from the Rosetta mission, sports a greenish coma and tail, heading for its perihelion on November 2.
HD image at https://apod.nasa.gov/apod/ap211022.html
