Comet C/2025 A6 Lemmon has the potential to become brighter and naked eye visible when it is closest to the Earth in the early evening on October 21, 2025.  

But it can be seen now before sunrise with the right tools.  I picked my smaller telescope “Z” in case the tail was long (next time I’m going to try my bigger telescope).  I calculated the amount of time that the comet would move across a half pixel to set the exposure length of 30 seconds so the comet wouldn’t blur.  

On Friday morning from my Bortle 7 – 8 driveway, the comet was lovely in my smaller telescope, but I could not spot it in single images with my camera with an 85 mm lens or with the binoculars.

Happily, this is a holiday weekend with clear skies, so I am going to have several chances to image it. 

What are you enjoying this weekend?

Camera geek info:

• William Optics Zenith Star 73 III APO telescope
• William Optics Flat 73A
• ZWO 2” Electronic Filter Wheel
• Antila RGB filters
• ZWO ASI183MM-Pro-Mono camera
• William Optics Uniguide 32MM F/3.75
• ZWO ASI220MM-mini
• ZWO ASiair Plus
• iOptron CEM40
• Friendswood, Texas Bortle 7-8 suburban skies

Frames:

• October 10, 2025
  • 64 30 second Gain 150 R lights
  • 30 0.05 second Gain 150 R flats
  • 64 30 second Gain 150 G lights
  • 30 0.02 second Gain 150 G flats
  • 60 30 second Gain 150 B lights
  • 30 0.05 second Gain 150 B flats
  • Matching darks and flat darks from library