NGC 5897 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Libra (Lib) · Contains: NGC 5897

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NGC 5897

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NGC 5897

NGC 5897 is a globular cluster, 135 light years in diameter, located 40,000 light years away in the constellation of Libra. Although this cluster is fairly large, it does not show up very well in my image. I was about to throw out this image set when I checked the few other Astrobin images done of this object, including submissions by my colleagues Kurt and Lawrence. All of the other images are also relatively dim.

After further investigation, I found that this cluster has an unsually high Shapley–Sawyer Concentration Class Index. It is classified as 11 out of 12, which means that it has a very low star density in its center. As a result, and also because this cluster is low in the southern sky for many of us, this object is not an easy cluster to image well.

Globular Star Clusters
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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	3173854
PixInsight job	IPGISVWG6FHFVFR907SL2V1MFUEZZAJI
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	15h17m23s.793
RA (top/left)	15h16m29s.470
RA (top/right)	15h16m16s.300
RA (bottom/right)	15h18m18s.786
RA (bottom/left)	15h18m31s.300

Dec (center)	-21°00′54″.37
Dec (top/left)	-20°40′20″.84
Dec (top/right)	-21°19′15″.33
Dec (bottom/right)	-21°21′26″.83
Dec (bottom/left)	-20°42′31″.85

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NGC 5897

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NGC 5897

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