C/2023 H2 (Lemmon) 2023-Nov-01 Dan Bartlett

Extensive data usage deserves an explanation.

Five images and their inverted color counterparts each showing comet C/2023 H2 Lemmon imaged for around an hour, just prior to evening comet-set. Grouping the comet in 20 minute integration time seem to be the sweet spot to prevent blurring of the faint tail structure and keeping the SNR respectable. This comet has brightened up to better than 8th magnitude (COBS website) and is closing quickly ( Might have to comet track shortly) on the earth with earth's MOID on November 10th. ASTROBIN Full Res: https://astrob.in/itm31w/E/

New Animation:
From 118 x 30 second exposures of comet C/2023 H2 Lemmon taken on the evening of November 1, 2023. Originally I integrated all 118 exposures with the resulting stack quite the blurry mess. Restacking into groups of 15 minutes showed the comet's tail to be quite active, changing in appearance over the hour of imaging time. Here I animated 20 minute groups of 30 second exposures, removing the stars and centering on one time period for the evening. First five normal frames followed by 5 inverted color frames, with each frame static at half a seconds or other words 2 FPS. The integration consisting of stars and the comet looses much of the fine cometary tail structure however this may be limited to my inability in processing. ASTROBIN Full Res: https://astrob.in/bc135d/0/

Observational details:
Backyard setup
scope: C14 D = 356mm; fl =729mm; F# 2
camera: asi 2600mcP
exposure: 118 x30 sec
Seeing: 4/5
Transparency: 9/10
Observer: DEBartlett

Image details (ALL):
Projection ............... Gnomonic
Projection origin ........ [795.252621 1479.407978] px -> [RA: 14 23 17.787 Dec: +50 34 51.14]
Resolution ............... 2.129 arcsec/px
Rotation ................. -0.593 deg
Reference system ......... ICRS
Observation start time ... 2023-11-02 02:32:23 UTC
Observation end time ..... 2023-11-02 02:32:53 UTC
Geodetic coordinates ..... 119 04 46 W 37 46 30 N 2357 m
Focal distance ........... 728.72 mm
Pixel size ............... 7.52 um
Field of view ............ 56' 24.4" x 1d 44' 56.2"
Image center ............. RA: 14 23 17.785 Dec: +50 34 51.16 ex: -0.000526 px ey: +0.004408 px
Image bounds:
top-left .............. RA: 14 26 15.000 Dec: +51 27 22.79 ex: -1.372442 px ey: -1.461752 px
top-right ............. RA: 14 20 13.762 Dec: +51 26 42.91 ex: +0.537629 px ey: -1.385738 px
bottom-left ........... RA: 14 26 15.131 Dec: +49 42 38.33 ex: -1.352172 px ey: +0.567190 px
bottom-right .......... RA: 14 20 26.957 Dec: +49 42 00.03 ex: +0.726393 px ey: +0.532012 px