Comet 3I/ATLAS with a complex tail
Taken by Michael Jaeger on November 8, 2025 @
AZM Martinsberg Austria
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There is something unusual to report. 3I/ATLAS showed a complex tail structure early this morning. We observed it at 29 degrees elongation from the Sun.
The sum image from 24x35sec green and 2x35 red and 2x35 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 6x35 sec green).
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