Sh2-16 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: 13.85 · 78 Diana · Sh2-16

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Sh2-16

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Sh2-16

This object (Sh2-16) is a HII region located 5000 light years away in the southern constellation of Sagittarius at a declination of -29 degrees. It is also known as RCW 137 and Gum 70. Sh2-19 is the large HII region in the upper left corner, while Sh2-18 is the small circle of HII between Sh2-16 and Sh2-19.

Sh2-16 is ionised by the star TYC 6840-271-1, which is the medium-bright pure white star in the center of the HII region, a short distance directly above the top yellowish star. The dust bands around that yellowish star have interesting shapes.

One star cluster appears in the right center of the Sh2-16 region - Collinder 347. This small, subtle cluster consists of 14 bright blue and yellow stars. The cluster is in the shape of a horizontal oval, with the left side of the cluster silhouetted against the large dark dust patch on the right side of Sh2-16.

The refractors!
Cloudy Nights
First on Astrobin
Open Star Clusters
Narrowband imaging
Takahashi Refractors
ZWO ASI1600MM/QHY163M
Sharpless2 Objects

Astrobin Debuts (670 DSOs)
Gum Catalog (47/85)
HII-Dominated Nebulae
Sharpless Catalog (200/313)

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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Star trails
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Distribution of data sources

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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	2832184
PixInsight job	JOVZ56CUEOYBEN2YKZGI38YD8B5D304W
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	17h46m38s.232
RA (top/left)	17h48m39s.967
RA (top/right)	17h44m52s.887
RA (bottom/right)	17h44m35s.873
RA (bottom/left)	17h48m24s.331

Dec (center)	-29°21′32″.12
Dec (top/left)	-29°05′02″.69
Dec (top/right)	-29°00′22″.10
Dec (bottom/right)	-29°37′53″.96
Dec (bottom/left)	-29°42′37″.26

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Sh2-16

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