Comet C/2025 A6 (Lemmon)

Single exposure image of Comet C/2025 A6 (Lemmon), October 20, 2025. Tech: Canon EOS 5D Mk. 4 DSLR, 400mm lens, f/5.6, ISO 10,000, 4 seconds.

October 21, 2025 — It was a tough one to find but, after a good deal of effort under near-pristine (for us) skies, I was able to spot the comet C/2025 A6 (Lemmon) from a Medina County, Ohio park. This (above) is a quick edit of a single frame. Star tracking wasn’t what it should have been; I’ve got to get more practice in the field! I worked on combining multiple frames the next morning, attempting to create a better quality image.

Stacking RAW images of C/2025 A6 (Lemmon) I did what I could to pull the most out of the imagery. What we got was a somewhat “cleaner” version. Not spectacular but the best we could do given all circumstances. I hope to learn improved processing skills and revisit the source images in the future. In the meantime, though the pictures are not spectacular, I’m happy to have bagged another comet. After all, how many of them do most of us see in a lifetime? These were recorded the night of October 20 but the UTC time conversion moves the date to the 21st.

Stacked image of Comet C/2025 A5 (Lemmon), October 20, 2025
A SkySafari chart showing the position of Comet C/2025 A6 at about 7:30 PM EDT, October 20, 2025, as viewed from Northeastern Ohio.