220p 20260807 dbartlett

 

_220P_McNaught_TandemRASA11s_asi6200mmP_asi6200mcP_44x60sec_20260807_042721local_JuneLake_California_USA_DEBartlett
 

 
 

We Have a Bubble! Shockwave Around the Inner Coma, 2 Days after the Outburst, Aug 07 2026
 

 
 

ASTROBIN-Full Resolution, animations and other Goodies:
 

https://app.astrobin.com/i/wfr5yn?r=0
 

 
 

Project Notes:
 

    Best seen on the cropped starless image https://app.astrobin.com/i/wfr5yn?r=E , a shell or bubble surrounding the curved central region. 
    Measured brightness of 7.0 and a dust tail measured at over 1 degrees long (76minutes) @ 254 degrees clearly seen on individual 60 sec subs (see animated version https://app.astrobin.com/i/wfr5yn?r=F ).  
    Dust tail more condensed/ less streamers than yesterday https://app.astrobin.com/i/lca9ra?r=B . 
    Managed to salvage and stack a mere 44 subs due to monsoonal moisture settling in. 

 

 
 

Observational details:
 

    Backyard setup 
    2xscopes Tandem: RASA11 D = 279mm; fl =620mm; F# 2.2 
    camera: asi6200mmP and asi6200mcP 
    Seeing: 3.5/5  
    Transparency: 7.5/10 Moonlight present 
    Observer: DEBartlett 
    Location: June Lake, California, USA 

 

 
 

Image Info:
 

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

    Resampled 2x2 
    Acquisition...............44x60sec total 
    Resolution ............... 2.501 arcsec/px 
    Rotation ................. -2.131 deg 
    Field of view ............ 3d 11' 44.0" x 1d 58' 16.5" 
    Image center ............. RA: 2 39 16.974 Dec: +9 23 25.07 

 

 
 

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 07.48 C 7.0 AR 28.0T 2A380 7.8 76.7m254 ICQ XX BARaeI a120C 7.76mZCP IMX TYT 0 U9*0.09 8.6 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 50.4
 

 
 

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 07/08/2026 11:31:52 10.80 9.91 9.46 9.11 8.89 8.72 83.2 17.2 U66
 

220P 07/08/2026 11:31:52* 0.08 0.08 0.08 0.08 0.08 0.08 23 10.5 ATL
 

 
 

 AFRHO LOG
 

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

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

220P 07/08/2026 11:31:52 1.23 1.65 22.36 9.77 83 7668 1167 3.885 U66