Monthly Archives: October 2025

Comet C/2025 A6 Lemmon on 12 October 2025

Posted on by
2

Sunday, October 12, was my third morning in a row trying to capture Comet C/2025 A6 Lemmon.  This time, I used my bigger telescope, Blue, from my driveway.

From my Bortle 8 driveway, I still could not spot the comet with binoculars.

My larger telescope with about 1.2 hours worth of data certainly picked up more details in the comet and more stars than my smaller telescope did two nights earlier.  

Comet processing takes a long time, and I’ve had some good luck as far as weather, more pictures to come …

Camera geek info:

  • William Optics Pleiades 111 telescope
  • ZWO 2” Electronic Filter Wheel
  • Antila RGB filters
  • Blue Fireball 360° Camera Angle Adjuster/Rotator
  • 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 12, 2025
    • 100 15 second Gain 150 Red lights
    • 30 0.02 second Gain 150 Red flats
    • 99 15 second Gain 150 Green lights
    • 30 0.01 second Gain 150 Green flats
    • 92 15 second Gain 150 Blue lights
    • 30 0.01 second Gain 150 Blue flats
    • Matching darks and flat darks from library

Comet C/2025 A6 Lemmon on 11 October 2025

Posted on by
Reply

Saturday, October 11, was my second morning in a row trying to capture Comet C/2025 A6 Lemmon.  This time, my husband and I drove to darker skies with a clear horizon looking out over the water in Bacliff, Texas.  

From Bortle 6 skies, 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.

Comparing this image, which uses less data, to the image I got the day before from my driveway with brighter skies, I think you can see that the drive to even slightly darker skies was worth it.

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
  • Bacliff, Texas Bortle 6 suburban skies

Frames:

  • October 11, 2025
    • 50 30 second Gain 150 R lights
    • 30 0.05 second Gain 150 R flats
    • 50 30 second Gain 150 G lights
    • 30 0.02 second Gain 150 G flats
    • 51 30 second Gain 150 B lights
    • 30 0.05 second Gain 150 B flats
    • Matching darks and flat darks from library

Comet C/2025 A6 Lemmon on 10 October 2025

Posted on by
2

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