220p 20260821 dbartlett

 

_220P_McNaught_TandemRASA11s_asi6200mmP_asi6200mcP_53x180sec_20260821_045639_local_JuneLake_California_USA_DEBartlett
 

 
 

The Heck with the High Clouds, Comet 220P/McNaught Still showing its Colors - Aug 21 2026
 

 
 

ASTROBIN-Full Resolution, animation and other Goodies:
 

https://app.astrobin.com/i/96tx8y?r=0
 

 
 

Project Notes:
 

    Comet 220P/ McNaught continues to lengthen while the green coma continues to shrink. 
    Tail measured at 45.5arc minutes and brightness of the comet measured at magnitude of 10.1. 
    Considerable dust / IFN in the FOV. 
    A little over 2.5 hours of integration time with twin scopes were used to "beat" the high clouds present. 
    Color calibration was performed with PixInsight's SpectrometricColorCalibration process using a white balance of the spectral class of our sun as reference.  Ideally this process lends to a more true rendition of a comet/nebula color however saturation of colors is the processor's choice. Ref: https://pixinsight.com/examples/C2022-E3-ZTF/ 

 

 
 

 
 

Observational details:
 

    Backyard setup 
    2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2 
    camera: asi6200mmP and asi6200mcP 
    Seeing: 3.5/5  
    Transparency: 6/10 high clouds 
    Observer: DEBartlett 
    Location: June Lake, California, USA 

 

 
 

Image Info:
 

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

    Resampled 2x2 
    Acquisition...............53x180sec total 
    Resolution ............... 2.500 arcsec/px 
    Rotation ................. -2.427 deg 
    Field of view ............ 2d 51' 31.9" x 1d 44' 56.1" 
    Image center ............. RA: 3 02 53.122 Dec: +9 13 26.07 

 

 
 

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 08 21.47 C 10.1 AR 28.0T 2E580 3.3 45.5m252 ICQ XX BARaeI a180C 3.25mZCP IMX TYT 0 U9*0.21 10.1 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 52.1
 

 
 

COD U66
 

OBS
 

CATALOG: ATLAS2 - BAND: r (Sun Mag=-26.93)
 

 
 

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

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

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

220P 21/08/2026 11:12:30 13.59 12.65 12.16 11.78 11.54 11.35 73.7 18.4 U66
 

220P 21/08/2026 11:12:30* 0.20 0.20 0.20 0.20 0.20 0.20 31 34.3 ATL
 

 
 

 AFRHO LOG
 

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

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

220P 21/08/2026 11:12:30 1.17 1.69 23.57 12.44 74 625 234 2.796 U66
 
   
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