C/2023 A3 (Tsuchinshan-ATLAS) last several mornings
Taken by Mike Olason on September 29, 2024 @
Tucson, Arizona
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Details:
C/2023 A3 on the morning of 2024 September 29 UT was magnitude G=3.0 as calculated from 12x3 second images in an aperture diameter of 5', yesterday morning the comet was magnitude G=3.4, so an interesting increase in magnitude. Both mornings Astrometrica calculations were made from 12x3 second images in an aperture diameter of 5', the comet was at altitude 8.6 degrees, the Sun was - 8.2/8.3 basically the same altitude below the horizon, the twilight sky was clear both mornings and the same equipment was used. Conclusion is the comet had a nice increase in brightness, which also shows in the images with more debris streaming away from the comet coma on September 29. That is what the images showed from the desert looking over the Catalina Mountains.
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