NGC281 PacMan Nebula (Jerry Macon)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1590 · NGC 281 · PGC 137218 · PGC 137229 · PGC 137230 · PGC 137234 · PGC 137241 · PGC 137257 · PGC 137273 · PGC 137278 · PGC 137279 · PGC 137282 · PGC 137294 · PGC 137297 · PGC 137305 · PGC 137312 · PGC 137314 · PGC 137315 · Sh2-184

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NGC281 PacMan Nebula

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NGC281 PacMan Nebula

NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm. This 20×30 arcmin sized nebulosity is also associated with open cluster IC 1590, several Bok globules and the multiple star, B 1. It collectively forms Sh2-184,[3] spanning over a larger area of 40 arcmin. A recent distance from radio parallaxes of water masers at 22 GHz made during 2014 is estimated it lies 2.82±0.20 kpc. (9200 ly.) from us. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

E. E. Barnard discovered this nebula in August 1883, who described it as "a large faint nebula, very diffuse." Multiple star 'B 1' or 1 was later discovered by S. W. Burnham, whose bright component is identified as the highly luminous O6 spectral class star, HD 5005 or HIP 4121. It consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 arcsec. There has been no appreciable change in this quintuple system since the first measures were made in 1875.

The nebula region is visible in amateur telescopes from dark sky locations. In his book Deep Sky Wonders, Walter Scott Houston describes the appearance of the nebula in small telescopes:

"There was a faint glow in the immediate vicinity of the multiple star, with an occasional impression of a much larger nebulosity...Its surface brightness was much less than that of M33 in Triangulum or NGC 205, the distant companion of the Andromeda galaxy."

(Wikipedia)

Sharpless 2 Objects

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Advanced success
Started	...
Astrometry.net job	1860733
PixInsight job	PSACZ2SLK0TWS10Y6VEFNWV7KPDZTR1G
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h52m40s.53
RA (top/left)	00h49m32s.94
RA (top/right)	00h49m33s.73
RA (bottom/right)	00h55m41s.10
RA (bottom/left)	00h55m52s.71

Dec (center)	+56°40′10″.9
Dec (top/left)	+57°18′54″.2
Dec (top/right)	+56°01′46″.8
Dec (bottom/right)	+56°01′14″.8
Dec (bottom/left)	+57°18′22″.5

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NGC281 PacMan Nebula

NGC281 PacMan Nebula

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