Barnard's Galaxy (NGC 6822) (KuriousGeorge)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Barnard's Galaxy · NGC 6822

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Barnard's Galaxy (NGC 6822)

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Barnard's Galaxy (NGC 6822)

Barnard's Galaxy is a barred irregular galaxy approximately 1.6 million light-years away in the constellation Sagittarius. Part of the Local Group of galaxies, it was discovered by E. E. Barnard in 1884 with a six-inch refractor telescope. It's one of the closer galaxies to the Milky Way. It's similar in structure and composition to the Small Magellanic Cloud. It's about 7,000 light-years in diameter.

Edwin Hubble identified 15 variable stars in this galaxy. He also surveyed the galaxy's stars distribution down to magnitude 19.4. He provided spectral characteristics, luminosities and dimensions for the five brightest "diffuse nebulae" (giant H II regions). This included the Bubble and Ring Nebula. He also computed the absolute magnitude of the entire galaxy.

Hubble's detection of eleven Cepheid variable stars was a milestone in astronomy. Utilizing the Cepheid Period-Luminosity relationship, Hubble determined a distance of 698,000 light-years. This was the first system beyond the Magellanic Clouds to have its distance determined.

Hubble's distance to this galaxy was way beyond Harlow Shapley's value of 300,000 light-years for the size of universe. In the paper, Hubble concluded the "Great Debate" of 1920 between Heber Curtis and Shapley over the scale of the universe and the nature of the "spiral nebula". It soon became evident that all spiral nebulae were in fact spiral galaxies far outside our own Milky Way.

In 1977, Paul W. Hodge extended the list of known H II regions in Barnard to 16. Today, there are over 150 of these regions catalogued in Barnard's Galaxy.

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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
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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
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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	...
PixInsight job	L0GTCSV7YDO0M6J0IPOL0MMKRVFF5VMV
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	19h44m56s.953
RA (top/left)	19h46m00s.275
RA (top/right)	19h43m56s.309
RA (bottom/right)	19h43m53s.467
RA (bottom/left)	19h45m57s.619

Dec (center)	-14°48′37″.38
Dec (top/left)	-14°34′13″.62
Dec (top/right)	-14°33′35″.52
Dec (bottom/right)	-15°03′00″.76
Dec (bottom/left)	-15°03′41″.30

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Barnard's Galaxy (NGC 6822)

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Barnard's Galaxy (NGC 6822)

Barnard's Galaxy (NGC 6822)

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