Comet Atlas K1 still the best comet in the sky
in the evening sky
12/9/25

 

            
This comet is arguably
            the most photogenic comet in the sky at this point in time. Both
            nuclear fragments were seen indistinctly in the sub frames, however
            at this level of magnification they are not visible. The yellowish
            comet is framed against a richly colored starfield in Cassiopeia,
            with a sweeping dust tail far longer than I anticipated from
            the dim subframes. Well worth spending some time on this one.

            
The second image
            was taken simultaneously as a wide field context image and shows
            about 5x the field around the main target.

            
-Comet: C/2025 K1
            Atlas

            -Date/Time Local: 12/9/25 9:15 pm MST

            -Date/Time UT: 12/10/25 4:15 UT

            -FOV: 94' x 75'

            -Orientation: N up

            -Seeing: 3

            -Transparency: 6

            -Orig. Scale: 1.2 arcsec/Pixel

            -Instrument: 10" f/3.8 Newt

            -Exposure: 60 min total

            -Camera: Atik 16200

            -Location: Payson,AZ

            
10" f/3.9 Newtonian Astrograph

Select an image size for a larger view:

1600 x 1200
            



            
WO MiniCat 51 Astrograph

Select an image size for a larger view:

1600 x 1200
            


Lens:  10" f/3.9 GSO Astrograph Newtonian w/Nexus corrector
Platform:  Astrophysics AP1200
Camera:  Atik 16200 CCD
Exposure:  60mins
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing  7/10, Transparency 6/10
Outside Temperature:  32F
Processing Tools:  Maxim DL, Photoshop CS2

Lens:  Williams Optics Minicat 51 f/3.5
Platform:  Astrophysics AP1200
Camera:  ASI2600MC pro
Exposure:  60mins

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