67P/Churyumov-Gerasimenko 2021-Oct-16 Chris Schur

Comet Churyumov Gerasimenko 67P skims M35 in Gemini
with 10" f/3.9 Astrograph

This close up of this approaching comet shows the close pass to the open cluster M35 in the feet of Gemini. Taken at 2:30am, the comet is curretly at 10th magnitude. The field here is about half a degree wide and is with my 10 inch at f/3.9. Exposure time was 53 mins total for L, RGB images.

Note that the comet now has a beautiful cyan color around its head. This is outgassing carbon molecules preceeding the streaming more yellow dust tail extending to the right.

Instrument: 10" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount: Astrophysics 1200 QMD
CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling
Guider: Meade DSI Pro w/80mm piggyback refractor
Exposure: 53mins LRGB
AstroDon RGB Combine Ratio: 1: 1.05: 1.2
Location: Payson, Arizona, Elevation: 5150 ft.
Sky: Seeing FWHM = 3 arcsec , Transparency 9/10
Outside Temperature: 45 F
CCD Temperature: -20 C
Image Processing Tools:
Maxim DL6: Calibration, deblooming (Starizona Debloomer), aligning, stacking
PixInsight: Curves, Deconvolution
Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup

http://www.schursastrophotography.com/newcomets/CometCG-101621.html