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#comet

16 posts13 participants0 posts today
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TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️

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.)

skyandtelescope.org/astronomy-

Comet finder chart for morning of 21 April, comet low in northeast near the horizon. Comet might be magnitude 5. Moon is last quarter. Red line approximates the horizon.
Comet finder chart for evening of 31 April in the northwest sky, low to horizon. Comet *might* be magnitude 2.5. Moon is only three days old. Red line approximates the horizon.
Predicted light curve of the comet through early May.
Some stats on how close and bright the comet will get during closest approach at the beginning of May.
#Comet#Astronomy#Astrophotography
Continued thread
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Daniel Fischer

The visibility conditions for comet C/2025 F2 (SWAN) through perihelion and maximum brightness for 51.5° North - see facebook.com/dan.fischer.393/p 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.

Columns of numbers - I can't see how a useful ALT text for such a table would look like, sorry ...
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CBC Technology Science

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
cbc.ca/news/science/comet-swan

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CosmicRami

A new comet has appeared - Comet SWAN25F.

It's still in the process of being catalogued. Discovered by Aussie amateur astronomer Michael Mattiazzo.

It is brightening to binoc level observability. Its tail is long, about 2 degrees

This image was taken by Michael Jäger and Gerald Rhemann.

a bright, green comet with a small, round nucleus and long wispy tail stretching behind it. The background is a field of stars.
#Comet#Astrophotography#Astronomy
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Jorma Ryske

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 taivaanvahti.fi/observations/s

Color image of comet SWAN25F, coma is glowing green/turquoise beccause C2 ions emission.
Black and white image of comet showing quite long tail almost 1 degree toward image upper right corner position angle 300 degree.
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Jorma Ryske

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 taivaanvahti.fi/observations/s

Color image of comet SWAN25F, Green/turquoise coma is glowing because of C2 ions emission.
Black and white image show comets quite long tail almost 1 degree toward upper right
Continued thread
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AkaSci 🛰️

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

Image of comet SWAN25F Source: https://x.com/xwlj_XLR/status/1909155062049636555
Continued thread
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AkaSci 🛰️

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).

physicstoday.scitation.org/do/
pnas.org/doi/10.1073/pnas.2113
#comet
4/n

1. Graphic of Diatomic carbon. Source: https://www.researchgate.net/figure/Dicarbon-moleculeThe-original-figure-is-from-4-Used-under-Creative-Commons-License_fig4_328571186 2. Graph from paper showing emissions at various energy levels. The green fluorescence of C2 in comets is due to d3Πg → a3Πu emission (Swan bands).
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Astronomy Picture of the Day

APOD from 2025-03-31

Parker: The Solar System from Near the Sun

NASA's Parker Solar Probe captured a time-lapse from inside #Mercury's orbit, showing coronal streamers, a Coronal Mass Ejection, and #planets like Mercury and #Venus. Between #Earth and #Mars, #Comet Tempel 1 appears. The video also shows high-energy solar particles. This data helps us understand space weather impacts on Earth.

Video at apod.nasa.gov/apod/ap250331.ht #astronomy #saturn #jupiter #eclipse

apod.nasa.govAPOD: 2025 March 31 – Parker: The Solar System from Near the SunA different astronomy and space science related image is featured each day, along with a brief explanation.
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The Inquisitive Biologist

This week's #NewBooks at the library: Some second-hand treasures - The Great #Comet Crash: The Collision of Comet Shoemaker-Levy 9 and #Jupiter from Cambridge UP, and two books from Rutgers UP: Upheaval from the Abyss: #Ocean Floor Mapping and the Earth Science Revolution (sans dust jacket), and Mass Destruction: The Men and Giant #Mines That Wired America and Scarred the Planet #Books #Scicomm #Bookstodon #Astronomy #Oceanograph #Geology #EarthSciences #EnvironmentalHistory #History @bookstodon

A photo of three books standing on a small, brown, wooden table. On the left, standing up, The Great Comet Crash, showing a picture of Jupiter taken with a telescope. In the middle, lying down, Upheaval from the Abyss, showing a marine blue spine with silver lettering (the dust jacket is missing). On the right, standing up, Mass Destruction, showing an golden/honey coloured aerial photo of an open-pit mine. The out-of-focus background shows black shelves full of books and part of the beech-coloured laminate floor.
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Jeff
In my off season this past fall, I decided to go to Kauai and go backpacking all over the island. Coming from Alaska it was quite pleasant to wear shorts constantly and have good fresh fruit everywhere you went. While I was camping on the west side of the island I decided to pull the camera out and get some Milky Way shots. What I totally forgot about was the #comet C/2023 A3 passing by our planet.

The hooting and hollering that I made when I first looked at the image could be heard for miles.

The upper part of the cloud is lit up from the moon rising behind the island creating a very pleasing image.
I am shooting this on a #sony A7iii with a 20mm f1.8 lens. 30” exposure, iso 1250

#milkyway #astrophotography #comet #sonyalpha #kauai #hawaii #beaches #nightsky #ocean #nature #hiking #camping
#camping
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