NGC 869 & 884 Open Cluster in Perseus (autonm)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: 10 Per · 7 chi Per · 8 Per · 9 i Per · Double cluster · Misam · NGC 869 · NGC 884 · The star 7Per · The star 8Per · The star 9Per · chi Persei Cluster · h Persei Cluster

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NGC 869 & 884 Open Cluster in Perseus

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NGC 869 & 884 Open Cluster in Perseus

Newcastle, UK

NGC 869 Open Cluster in Perseus (top of image)

NGC 869 is an *open cluster located 7600 light years away in the constellation of Perseus. The cluster is most likely around 13 million years old. It is the westernmost of the Double Cluster with NGC 884.

The clusters are a few hundred light years apart from each other.

NGC 884 Open Cluster in Perseus (bottom of image)

NGC 884 is an open cluster located 7600 light years away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. The cluster is most likely around 12.5 million years old.

*An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist.

They are loosely bound by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center. This can result in a migration to the main body of the galaxy and a loss of cluster members through internal close encounters.

Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.

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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
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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
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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	4890322
PixInsight job	5YJF8LTQJ0QLH3X2MFJHBFF64M5YCTMQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h19m43s.80
RA (top/left)	02h12m32s.87
RA (top/right)	02h14m40s.40
RA (bottom/right)	02h26m29s.21
RA (bottom/left)	02h25m08s.70

Dec (center)	+57°03′45″.9
Dec (top/left)	+58°13′59″.4
Dec (top/right)	+55°43′06″.8
Dec (bottom/right)	+55°51′59″.9
Dec (bottom/left)	+58°23′40″.3

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NGC 869 & 884 Open Cluster in Perseus

NGC 869 & 884 Open Cluster in Perseus

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NGC 869 & 884 Open Cluster in Perseus

NGC 869 & 884 Open Cluster in Perseus

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