We observed it at 29 degrees elongation from the Sun.
The sum image from 24x35sec green and 2×35 red and 2×35 blue with 11″ RASA shows a 5′ coma and 4-5 tails or jets: 400“ pa 0, 500” pa 316, 900“ pa 295, 430” pa 278 and a counter-tail 200″ pa 109
At the time of exposure, the comet was 7-10° above the horizon; at the end, twilight interfered with the observation, which took place under bright moonlight.
We observed from a mountain location.
The comet was 9m1 bright (measured from 6×35 sec green).
3I/ATLAS 2025-11-08 4.10 UT 20min RGB
3 Comments
From Michael Jäger:
We observed it at 29 degrees elongation from the Sun.
The sum image from 24x35sec green and 2×35 red and 2×35 blue with 11″ RASA shows a 5′ coma and 4-5 tails or jets: 400“ pa 0, 500” pa 316, 900“ pa 295, 430” pa 278 and a counter-tail 200″ pa 109
At the time of exposure, the comet was 7-10° above the horizon; at the end, twilight interfered with the observation, which took place under bright moonlight.
We observed from a mountain location.
The comet was 9m1 bright (measured from 6×35 sec green).
3I/ATLAS 2025-11-08 4.10 UT 20min RGB
M. Jäger, G. Rhemann, E. Prosperi G00
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Full images in the link above.
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Collage by me.
Its getting weirder by each day.
Can someone ELI5 what this means?