Double Cluster (Kirby Collins)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 7 Per) · 7 chi Per · Double cluster · HD13659 · HD13784 · HD13831 · HD13841 · HD13854 · HD13866 · HD13890 · HD13900 · HD13910 · HD13969 · HD13970 · HD14012 · HD14051 · HD14052 · HD14053 · HD14092 · HD14134 · HD14143 · HD14162 · HD14184 · HD14186 · HD14210 · HD14250 · HD14270 · HD14330 · HD14357 · HD14422 · And 20 more.

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Double Cluster

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Double Cluster

The "Double Cluster" is technically in the constellation Perseus, but it is more easily found by extending a line from the stars Navi and Ruchbah in the constellation Cassiopeia. The open clusters are visible as a pair of fuzzy patches in binoculars, but also easily fit in the 1.5 degree field of view from my refractor.

NGC 869 and NGC 884 are about 7000 light years from us and are separated by only a few hundred light years. Pairs of clusters with similar ages and close proximity may indicate that star formation can occur in multiple regions in the same molecular cloud; a study of binary clusters in 1995 found as many as 8% of all open clusters may be members of a binary pair ["Probable binary open star clusters in the Galaxy", A. Subramaniam et al, Astronomy and Astrophysics, 1995].

https://ui.adsabs.harvard.edu/abs/1995A%26A...302...86S/abstract

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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
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	6463400
PixInsight job	9RRIEQ4G3CSKRFAVDG3WI7BUBWS87G5E
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h20m20s.92
RA (top/left)	02h25m32s.38
RA (top/right)	02h14m38s.23
RA (bottom/right)	02h15m18s.100
RA (bottom/left)	02h25m53s.81

Dec (center)	+57°09′06″.7
Dec (top/left)	+57°44′38″.7
Dec (top/right)	+57°39′09″.2
Dec (bottom/right)	+56°32′42″.4
Dec (bottom/left)	+56°38′08″.8

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Double Cluster

Double Cluster

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Double Cluster

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