116p 20260919 dbartlett

 

_161P_Hartley_IRAS_TandemRASA11s_asi6200mmP_asi6200mcP_126x45sec_20260919_014244_local_JuneLake_California_USA_DEBartlett
 

 
 

Fast moving Comet 161P/ Hartley-IRAS Moving Northward Towards Earth's MOID, Imaged on Sept 19 2026
 

 
 

ASTROBIN-Full Resolution, animations and other Goodies:
 

https://app.astrobin.com/i/9szkfm?r=0
 

 
 

Project Notes:
 

    Comet 37 max altitude in the southern skies moving quickly.  
    Kept the exposures down to 45 seconds since Hartley-IRAS apparent motion over 5"/min. 
    Overall measured brightness mag 12.4. 
    Stacked inverted color images shows the faintest part of the coma extending more than 25' in diameter. 
    No tail observed. 
    As usual, 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  
    Transparency: 7/10 
    Observer: DEBartlett 
    Location: June Lake, California, USA 

 

 
 

Image Info:
 

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

    Resampled 2x2 
    WideField 
    Acquisition..............126x45sec total 
    Resolution ............... 2.501 arcsec/px 
    Rotation ................. -0.479 deg 
    Field of view ............ 2d 54' 15.0" x 1d 54' 48.3" 
    Image center ............. RA: 1 23 05.842 Dec: -14 43 00.03 

 

 
 

 
 

161P (Hartley-IRAS)
 

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
 

161 2026 09 19.38 C 12.4 AR 28.0T 2B610 1.7 ICQ XX BARaeI a 45C 1.67mZCP IMX TYT 0 U9*0.14 10.8 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 37.4
 

 
 

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
 

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

161P 19/09/2026 09:08:46 14.89 14.26 13.91 13.64 13.43 13.27 48.5 17.5 U66
 

161P 19/09/2026 09:08:46* 0.13 0.13 0.13 0.13 0.13 0.13 58 35.8 ATL
 

 
 

 AFRHO LOG
 

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

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

161P 19/09/2026 09:08:46 0.61 1.57 44.91 13.54 48 54 13 1.735 U66