Uploaded by

BAA Comet Section

Observer

dbartlett

Observed

2026 Oct 09 - 00:00

Uploaded

2026 Oct 13 - 10:33

Objects

161P Hartley-IRAS

Full filename

161p/161p_20261009_dbartlett.png

Target name

161P Hartley-IRAS

Title

_161P_Hartley_IRAS_TandemRASA11s_asi6200mmP_asi6200mcP_80x45sec_20261009_215406_local_JuneLake_California_USA_DEBartlett Comet 161P/Hartley-IRAS Hangs at Magnitude 11.7 on October 10th 2026 ASTROBIN-Full Resolution, animations and other Goodies: https://app.astrobin.com/i/8cz3jw?r=0 Project Notes: Comet 161P/Hartley-IRAS has just past its closest approach to earth one week prior and is near maximum predicted brightness. Very similar in shape and brightness to the newly reported comet P/2026 R2 Leonard, it is another greenish enveloping comet. Comparisons are difficult thru visual scans since they differ in length of exposures/stacks caused by differing sky environments and apparent motions. Widefield view has a number of interesting NGC and IC galaxies starting to show color and faint structure at the 620mm fl. Slight tail extension to the 8 o'clock position. tail observed. Color calibration was performed with PixInsight's SpectrophotometricColorCalibration 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: 9/10 Observer: DEBartlett Location: June Lake, California, USA Image Info: (All images processed solely using PixInsight and Comet Photometry Tycho-Tracker) Bin1x1 WideField Acquisition..............80x45sec total Resolution ............... 1.249 arcsec/px Rotation ................. 4.843 deg Field of view ............ 2d 19' 56.7" x 1d 32' 23.2" Image center ............. RA: 21 50 02.720 Dec: +2 26 31.98 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 10 10.22 C 11.7 AG 28.0T 2A845 3.7 1.7m103 ICQ XX BARaeI a 45C 3.66mZCP IMX TYT 0 U9*0.15 11.6 2.5s 2.5 Location: June Lake Overlook (MPC U66); Comment: Comet Alt. 53.4 COD U66 OBS CATALOG: ATLAS2 - BAND: g (Sun Mag=-26.46) 10x10 20x20 30x30 40x40 50x50 60x60 RSR FC COD COMET UTC +/- +/- +/- +/- +/- +/- N FWHM CAT ------------ ------------------- ----- ----- ----- ----- ----- ----- ---- ---- --- 161P 10/10/2026 05:15:44 15.39 14.72 14.34 14.02 13.82 13.64 52.7 19.6 U66 161P 10/10/2026 05:15:44* 0.14 0.14 0.14 0.14 0.14 0.14 41 14.6 ATL AFRHO LOG COMET UTC DELTA r AP " MAG RSR CM +/- AFRHO OBS ------------ ------------------- ----- ----- ----- ----- --- ----- ---- ----- --- 161P 10/10/2026 05:15:44 0.55 1.43 50.14 13.82 53 43 11 1.631 U66