Uploaded by

BAA Comet Section

Observer

dbartlett

Observed

2022 Nov 24 - 00:00

Uploaded

2022 Dec 16 - 19:28

Objects

73P Schwassmann-Wachmann

Full filename

73p/73p_20221124_dbartlett.jpg

Target name

73P Schwassmann-Wachmann

Title

A difficult target indeed where I had to crop out the blurred mountain ridge of Carson Peak, June Lake California. I had to attempt this comet since I've seen some S.Hemi Obsy images which are impressive. 24 x 90 sec stacked from my usual backyard setup. As I watched the evening subs appear on the computer screen I was surprised at the lack of central condensation of the nuclear region. Even the CometAlignment process in PixInsight could not hone in on the area. Is this comet near the end of its life? Very much reminded me of C/2020 F8 SWAN and C/2019 Y4 ATLAS as they disintegrated. My meager equipment and 73P's super low altitude barely hints at any real thoughts of this comet's health. Individual subs shows a ghost-like appearance. Observational details: Backyard setup scope: C11 RASA D = 279mm; fl =618mm; F# 2.2 camera: asi 2600mcP exposure: 24 x90 sec Seeing: 4/5 Transparency: 6/10 Observer: DEBartlett Location: June Lake, California, USA Image info: Projection ............... Gnomonic Projection origin ........ [943.079931 937.949150] px -> [RA: 21 28 26.757 Dec: -26 47 25.85] Resolution ............... 2.512 arcsec/px Rotation ................. 0.964 deg Reference system ......... ICRS Observation start time ... 2022-11-24 03:46:53 UTC Observation end time ..... 2022-11-24 03:48:23 UTC Geodetic coordinates ..... 119 04 46 W 37 46 51 N 2360 m Focal distance ........... 617.65 mm Pixel size ............... 7.52 um Field of view ............ 1d 18' 57.6" x 1d 18' 32.5" Image center ............. RA: 21 28 26.757 Dec: -26 47 25.85 ex: -0.000048 px ey: -0.000005 px Image bounds: top-left .............. RA: 21 31 25.806 Dec: -26 08 41.40 ex: +0.000004 px ey: -0.000465 px top-right ............. RA: 21 25 34.179 Dec: -26 07 23.80 ex: +0.000132 px ey: -0.000226 px bottom-left ........... RA: 21 31 21.385 Dec: -27 27 15.90 ex: -0.000441 px ey: +0.000726 px bottom-right .......... RA: 21 25 25.651 Dec: -27 25 56.94 ex: +0.000361 px ey: +0.002027 px