Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023 (Dan Bartlett)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Solar system body or event

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Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

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Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

-Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023 -
Stacked 24 x180 second exposures of the comet on November 2 (local) and 30 x 180 second exposures on November 3rd. Parallel processing of both nights, standardizing these processes as close as possible, proved ineffective in producing images of equal quality. I suspect the additional 18 minutes of stacking time on the second night as well as varying seeing conditions posed the biggest issue in cometary differences over the two sequential nights. Very "devilish" indeed. However, from the recent outburst last month, the central region is noticeably larger on the second night than the first. This was a surprise to me (See full scale cropped revisions) and I don't believe this can be explained via environmental differences alone.

I've merged both comet images using the PixelMath "max" function since the overlay would cancel out one or the other cometary features with such a close mosaic pair (large overlap). The comet has moved almost exactly 24 hours from upper right to lower left.

Many will be watching the central region expansions as well as future outbursts as we swing into perihelion early next year.

Original
B
C
Final
D

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Status	Advanced success
Started	...
Astrometry.net job	8709527
PixInsight job	HT486L5OSKTPWGBXW1TY7MZ9LKLU58F1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h45m09s.23
RA (top/left)	17h49m01s.48
RA (top/right)	17h41m23s.14
RA (bottom/right)	17h41m23s.64
RA (bottom/left)	17h48m48s.71

Dec (center)	+41°28′06″.8
Dec (top/left)	+42°24′33″.1
Dec (top/right)	+42°25′25″.6
Dec (bottom/right)	+40°31′09″.8
Dec (bottom/left)	+40°30′21″.2

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Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

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Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

Two Night "Merger" of Comet 12P/ Pons-Brooks from November 3/4 2023

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