220p 20260822 dbartlett

220P_McNaught_TandemRASA11s_asi6200mmP_asi6200mcP_71x180sec_20260822_031953_local_JuneLake_California_USA_DEBartlett
 

 
 

Another Night of High Clouds, However not as Bad, Comet 220P/ McNaught August 22 2026
 

 
 

ASTROBIN-Full Resolution, animation and other Goodies:
 

https://app.astrobin.com/i/zgmt9l?r=0
 

 
 

Project Notes:
 

    Comet 220P/ McNaught continues to lengthen while the green coma continues to shrink. 
    Tail measured at 51.1arc minutes and brightness of the comet measured at magnitude of 10.0. 
    Considerable dust / IFN in the FOV. 
    A little over 3 hours of integration time with twin scopes were used to "beat" the occasional high clouds. 
    As usual, 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: 6.5/10 ocassional 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...............71x180sec total 
    Resolution ............... 2.500 arcsec/px 
    Rotation ................. -2.441 deg 
    Field of view ............ 2d 50' 52.2" x 1d 43' 9.8" 
    Image center ............. RA: 3 02 18.810 Dec: +9 06 09.1 

 

 
 

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 22.45 C 10.0 AR 28.0T 2E220 3.2 50.7m252 ICQ XX BARaeI a180C 3.17mZCP IMX TYT 0 U9*0.10 9.9 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 48.0
 

 
 

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 22/08/2026 10:44:25 13.38 12.46 11.96 11.60 11.35 11.16 79.2 18.6 U66
 

220P 22/08/2026 10:44:25* 0.10 0.10 0.10 0.09 0.09 0.09 29 23.6 ATL
 

 
 

 AFRHO LOG
 

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

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

220P 22/08/2026 10:44:25 1.17 1.70 23.67 12.24 79 745 131 2.872 U66
 
   
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