M4 (Gary Imm) - AstroBin

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: HD147491 · HD147592 · HD147649 · M 4 · NGC 6121

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M4

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M4

This mag 5.4 globular cluster is loosely constructed, with a Shapley–Sawyer rating of 9 (out of 12). At a distance of about 7,200 light-years, M4 is one of the closest Messier objects to earth. It is 26 arc-minutes wide and has a diameter of 50 light years.

Note the contrast of hot (bluish) and cool (reddish) stars surrounding the core. You can easily see a bar structure horizontally across its central core region, consisting of 11th magnitude stars. Messier 4 has roughly the same apparent size as our full moon and is visible to the naked eye, but only in exceptionally good conditions. This object is relatively small for a globular cluster and contains about 20,000 stars, which is far fewer than the largest globular clusters which can contain up to 500,000 stars.

The refractors!
Cloudy Nights
Globular Star Clusters

Globular Clusters
Messier Catalog (Complete)

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	6223689
PixInsight job	VMO15RCF8T2DPVXV7ODADAPUAOA9Q8RH
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h23m34s.18
RA (top/left)	16h23m02s.85
RA (top/right)	16h25m53s.57
RA (bottom/right)	16h24m05s.29
RA (bottom/left)	16h21m14s.82

Dec (center)	-26°31′45″.2
Dec (top/left)	-27°02′27″.3
Dec (top/right)	-26°27′03″.1
Dec (bottom/right)	-26°00′59″.9
Dec (bottom/left)	-26°36′18″.3

Image Index:

Contribution Index (beta):

M4

M4

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Image Index:

Contribution Index (beta):

M4

M4

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Acquisition details

Description

Comments

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In these public groups

In these collections

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