Melotte 20 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 29 Per · 31 Per · 33 alf Per · 34 Per · Mirphak · Perseus · The star 29Per · The star 31Per · The star 34Per · The star Mirfak (αPer)

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Melotte 20

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Melotte 20

This object is an open cluster of about 50 stars located 600 light years away in the constellation of Perseus. It is named after the brightest star in Perseus, 1.8 magnitude Alpha Per, located in the center of this image. This cluster is one of the earliest discovered deep sky objects, described by the Italian astronomer Hodierna in 1654. It is interesting to me that the larger stars all lie some distance away from Alpha Per. It is also one of the few clusters I have imaged which has no visible double stars.

This cluster is one of a select number known as moving clusters because the convergence of the proper motions of their individual stars toward a convergent point is pronounced.

Some people call this the Saxophone Cluster, but I find that shape to be a stretch of the imagination.

Open Star Clusters
Cloudy Nights
ZWO ASI1600MM/QHY163M

Hidden Treasures Catalog (Complete*)
Open Clusters

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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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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Star trails
Northern lights
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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
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
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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	1890235
PixInsight job	DDBKIFPCXVSYC9USJ02S1NXM7LOYQZIA
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	03h24m15s.40
RA (top/left)	03h29m34s.50
RA (top/right)	03h31m57s.34
RA (bottom/right)	03h18m35s.12
RA (bottom/left)	03h16m57s.70

Dec (center)	+49°52′02″.5
Dec (top/left)	+48°19′05″.4
Dec (top/right)	+51°09′18″.4
Dec (bottom/right)	+51°24′04″.8
Dec (bottom/left)	+48°32′59″.9

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Melotte 20

Melotte 20

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Melotte 20

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