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Is this C/2024 G3 (ATLAS) starting to appear on SOHO’s LASCO C3 coronagraph?
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Yes, it is. I imaged it this afternoon in daylight from Chelmsford:
https://britastro.org/observations/observation.php?id=20250111_181128_a9e9cf292d6b6418
The elongation was less than 8 degrees so you need to be very careful.
If it is clear tomorrow (Sunday) morning and you can get to somewhere with a flat SE horizon it is worth trying to pick the comet up. It rises around 40 mins before sunrise at 51N and, given that it can be imaged in the daytime, it should be reasonably easy to pick up using a camera. From here (Chelmsford) it will be 6deg altitude at sunrise around 8am. My forecast is clear until 5am but then cloud.
Visual observations will be much harder but please report if you try.
Negative observation, I’m afraid. At sea close to the coast of Baha California, Mexico. Clear sky at sunrise – but no tail visible.
Malcolm PorterC/2024 (ATLAS) seems to have survived perihelion.
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Yes, the comet is looking very healthy at the moment. Hopefully it will put on a good show for southern observers when it emerges into a darker evening sky.
The public LASCO images have overexposed the comet. Here is the same image taken from a level 0.5 FITS file and processed more gently. It is a spectacular tail.
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I’ve posted an animation of some of the C3 frames from today here:
https://britastro.org/observations/observation.php?id=20250114_211401_cc96625da78ff2ec
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