220p 20260824 dbartlett

_220P_McNaught_TandemRASA11s_asi6200mmP_asi6200mcP_62x180sec_20260823_024320_local_JuneLake_California_USA_DEBartlett
 

 
 

ASTROBIN-Full Resolution, animation and other Goodies:
 

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

 
 

Project Notes:
 

    I've attempted to process Comet 220P/ McNaught each night with the same processes/procedure. Inconsistencies between images can be contributed to variations in sky conditions, length of exposures, integration time, shakiness of hand and of course actual comet changes. 
    This night had intermittent high clouds affecting the image as well as moonlight shortening the total amount of captures. 
    Tail measured slightly over two full moons in apparent length at 65.9 arc minutes and brightness of the comet measured at magnitude of 10.3. 
    Considerable dust and/or IFN in the FOV. 
    A little over 3 hours of integration time with twin scopes were used. 
    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  
    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...............62x180sec total 
    Resolution ............... 2.501 arcsec/px 
    Rotation ................. -2.365 deg 
    Field of view ............ 2d 30' 50.7" x 1d 43' 59.7" 
    Image center ............. RA: 3 06 49.504 Dec: +9 10 08.29 

 

 
 

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 24.43 C 10.3 AR 28.0T 2E400 2.6 65.9m252 ICQ XX BARaeI a180C 2.59mZCP IMX TYT 0 U9*0.10 10.2 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 44.3
 

 
 

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 24/08/2026 10:17:51 13.49 12.58 12.07 11.70 11.44 11.24 83.4 18.0 U66
 

220P 24/08/2026 10:17:51* 0.10 0.10 0.10 0.10 0.10 0.10 30 23.0 ATL
 

 
 

 AFRHO LOG
 

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

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

220P 24/08/2026 10:17:51 1.16 1.70 23.83 12.35 83 671 120 2.826 U66