220p 20261005 dbartlett

Project Notes:
 

    Months since its Aug5th outburst (see earlier sequence https://app.astrobin.com/i/je5hu9?r=E ) comet 220P/ McNaught can still be seen as a ghostly image of it's former self. 
    Measured brightness mag 13.5 
    The dust tail can be seen extending beyond the 2.5 degree FOV and a greenish coma can still be seen. 
    Over four hours of capture time between twin scopes shows the extensive dust field in the constellation of Taurus. 
    Closeup ( https://app.astrobin.com/i/g2mhvn?r=G ) shows a ever so slightly condensed nuclear region with a whisper of a faint irregular spine of a line and seems to be what's left after the two major eruptions. 
    The comet still holds some interest in appearance. 
    Despite the comet's faintness, its apparent motion is nearly stationary from our vantage point, despite the lengthy time on target, making this comet easier than most to capture and process. 
    Color calibration was performed with PixInsight's SpectrometricColorCalibration process using a white balance of the spectral class of our sun as reference. 

 

 
 

Observational details:
 

    Backyard setup 
    2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2 
    camera: asi6200mmP and asi6200mcP 
    Seeing:4.5/5  
    Transparency: 9/10 
    Observer: DEBartlett 
    Location: June Lake, California, USA 

 

Image Info:
 

(All images processed solely using PixInsight and Comet Photometry Tycho-Tracker)
 

    Resampled 2x2 
    Acquisition..............64x240sec 
    Resolution ............... 2.500 arcsec/px 
    Rotation ................. 6.029 deg 
    Field of view ............ 2d 35' 54.1" x 1d 31' 10.9" 
    Image center ............. RA: 3 27 39.549 Dec: +5 06 08.06 

 

 
 

220P (McNaught)
 

ICQ line:
 

IIIYYYYMnL YYYY MM DD.DD eM/mm.m:r AAA.ATF/xxxx /dd.ddnDC /t.ttmANG ICQ XX*OBSxxf InT APERTURcamchip SFW C ## u.uu xx.x PIXELSIZE
 

220 2026 10 05.38 C 13.5 AG 28.0T 2G920 2.1 10.4m262 ICQ XX BARaeI C 2.09mZCP IMX TYT 0 U9*0.21 13.6 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 53.1
 

 
 

COD U66
 

OBS
 

CATALOG: ATLAS2 - BAND: g (Sun Mag=-26.46)
 

 
 

 10x10 20x20 30x30 40x40 50x50 60x60 RSR FC COD
 

COMET UTC +/- +/- +/- +/- +/- +/- N FWHM CAT
 

------------ ------------------- ----- ----- ----- ----- ----- ----- ---- ---- ---
 

220P 05/10/2026 09:14:07 16.43 15.55 15.09 14.73 14.48 14.26 68.8 19.0 U66
 

220P 05/10/2026 09:14:07* 0.21 0.21 0.21 0.21 0.21 0.21 33 13.6 ATL
 

 
 

 AFRHO LOG
 

COMET UTC DELTA r AP " MAG RSR CM +/- AFRHO OBS
 

------------ ------------------- ----- ----- ----- ----- --- ----- ---- ----- ---
 

220P 05/10/2026 09:14:07 1.02 1.89 27.01 15.20 69 72 28 1.857 U66