NGC281 HST (Sergiy_Vakulenko)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD5005 · IC 1590 · LBN 615 · LBN 616 · NGC 281 · Sh2-184

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NGC281 HST

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NGC281 HST

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, spanning over a larger area of 40 arcmin. Colloquially, NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.

Edward Emerson Barnard discovered the nebula in August 1883, describing it as "a large faint nebula, very diffuse." Multiple star 'B 1' or β 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.
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	Distinct awarded users	Total awarded images
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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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	6967980
PixInsight job	TOXCSHUZM7B3AHG04LTXCJFXF85EWMK4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h52m44s.40
RA (top/left)	00h50m15s.20
RA (top/right)	00h55m35s.90
RA (bottom/right)	00h55m16s.39
RA (bottom/left)	00h49m51s.30

Dec (center)	+56°37′27″.0
Dec (top/left)	+56°17′57″.9
Dec (top/right)	+56°21′35″.7
Dec (bottom/right)	+56°56′46″.3
Dec (bottom/left)	+56°53′04″.1

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NGC281 HST

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NGC281 HST

NGC281 HST

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