Interstellar Comet 3I/ATLAS
Taken by Mike Olason on September 21, 2025 @
Tucson, Arizona
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Details:
Interstellar Comet 3I/ATLAS continues to brighten steadily, basically following Seiichi Yoshida's predicted magnitude curve as one can see from the star comparison and magnitude calculation on 9/21 when the comet was magnitude 12.9 near the much brighter magnitude 12.1 star.
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