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Clouds and Comet C/2025 A6 (Lemmon)

Posted: 19 October 2025

Saturday evening, 18 October 2025, there was a pretty sunset.

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1823 MST: Unfortunately, the clouds made for a challenging evening of photographing the comet, as seen in this iPhone 15 Pro Max photo. The comet would be just above the middle of the photo, but was hidden by the clouds. The bright star at the left is Arcturus.

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1834 MST: The clouds had moved sufficiently out of the way to allow Comet C/2025 A6 (Lemmon) to be seen with 7x50 binoculars. The coma was visible in the binoculars, but no tail.

With the comet playing hide-n-seek with the clouds, I was able to get some photos of Comet C/2025 A6 (Lemmon) using a tripod mounted D850 DSLR camera with a 70-300mm lens.

1838 MST (D850 DSLR, f/4.5, 3 seconds, ISO 3200, FL 70mm)
Mouseover or tap on image
Mouseover or tap on image for pointer to comet

1900 MST (D850 DSLR, f/4.5, 6 seconds, ISO 5000, FL 70mm)
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Click or tap on image for larger version

1905 MST (D850 DSLR, f/5.6, 3 seconds, ISO 25600, FL 300mm))
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I continued to view the comet using the binoculars when the clouds allowed until 1915 MST. I never saw it with just my eyes.

Based on the current brightness and tail length, I doubt that Comet C/2025 A6 (Lemmon) will become as nice as Comet Tsuchinshan-ATLAS was in October 2024.

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But with Comet Lemmon's closest approach to the Earth on 21 October 2025, who knows.


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