The Bubble, M52, Et Al. (schmaks)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 4 Cas · Bubble Nebula · M 52 · NGC 7538 · NGC 7635 · NGC 7654 · PK112-00.1 · Sh2-157 · Sh2-158 · Sh2-159 · Sh2-161 · Sh2-162 · The star 4Cas

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The Bubble, M52, Et Al.

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The Bubble, M52, Et Al.

Most nebulae can be described as diffuse nebulae, which means that they are extended and contain no well-defined boundaries. In visible light these nebulae may be divided into emission and reflection nebulae. Emission nebulae emit spectral line radiation from ionized gas (mostly ionized hydrogen); they are often called HII regions.

Reflection nebulae themselves do not emit significant amounts of visible light, but are near stars and reflect light from them. Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called “dark nebulae.”

Although these nebulae have different visibility at optical wavelengths, they are all bright sources of infrared emission, chiefly from dust within the nebulae.

Famed examples of emission nebulae include the Orion Nebula and Carina Nebula, both of which are stellar nurseries with hot O and B type stars.

The Pleiades in Taurus are an open star cluster passing through a dust cloud which scatters their blue light back to Earth in the form of a reflection nebula.

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Please note: The following tables are updated every 24 hours.

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	3975044
PixInsight job	U6GL1Z3ORVQ7Q1FATGDUX99KN8BB71TI
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h20m53s.28
RA (top/left)	23h12m38s.11
RA (top/right)	23h13m24s.54
RA (bottom/right)	23h28m25s.85
RA (bottom/left)	23h29m04s.44

Dec (center)	+61°13′02″.3
Dec (top/left)	+62°37′16″.6
Dec (top/right)	+59°46′54″.2
Dec (bottom/right)	+59°47′20″.1
Dec (bottom/left)	+62°37′36″.1

Image Index:

Contribution Index (beta):

The Bubble, M52, Et Al.

The Bubble, M52, Et Al.

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Image Index:

Contribution Index (beta):

The Bubble, M52, Et Al.

The Bubble, M52, Et Al.

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Sky plot

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In these public groups

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