Comet C/2025 R2 (SWAN)
Taken by Mike Olason on September 21, 2025 @
Tucson, Arizona
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Details:
C/2025 R2 (SWAN) is still just above the horizon as observed from Tucson when the evening sky gets dark enough to observe the comet in fading twilight above the low atmospheric haze just before the comet sets, on 9/21 UT at 2.5 degrees above the horizon calculated the comet magnitude at 6.8 in a fading twilight sky which only allows one to see a small part of the tail.
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