NGC 281 ( Nébuleuse Pacman - Pacman Nebula) (Christophe Monnier)

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

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NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

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NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

Découverte par l'astronome américain Edward Barnard en 1881, NGC 281 ou IC 11 (appelée aussi nébuleuse Pacman), est une région HII située à environ 9 500 années-lumière de la Terre dans la constellation de Cassiopée. D'un diamètre d'environ 100 années-lumière, cette nébuleuse en émission fait partie du bras de Persée. Elle inclut l'amas ouvert IC 1590 et l'étoile double HD 5005 au centre (de magnitude 7,8) qui assure, par son rayonnement UV à haute énergie, la plus grande partie de l’ionisation de la région hydrogène qui l’entoure.
Plusieurs globules de Bok (petits amas sombres de poussières et de gaz du milieu interstellaire au sein desquels peut commencer la naissance des étoiles) sont particulièrement visibles. De larges bandes de nuages de poussière masquent localement cette nébuleuse.

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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	8276677
PixInsight job	GPLM428MFE5GO2UD8QGPL90S9VR0JICF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h52m43s.118
RA (top/left)	00h50m49s.140
RA (top/right)	00h50m21s.324
RA (bottom/right)	00h54m34s.433
RA (bottom/left)	00h55m07s.870

Dec (center)	+56°40′14″.14
Dec (top/left)	+57°04′15″.12
Dec (top/right)	+56°19′17″.45
Dec (bottom/right)	+56°16′09″.80
Dec (bottom/left)	+57°00′58″.63

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NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

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Image Index:

Contribution Index (beta):

NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

NGC 281 ( Nébuleuse Pacman - Pacman Nebula)

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