NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus (Phil Swift)

Celestial hemisphere: Northern · Constellation: Perseus (Per) · Contains: NGC 869 · NGC 884 · The star 7Per · chi Persei Cluster · h Persei Cluster

NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus, Phil Swift

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NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

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NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus.
Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years.
Based on their individual stars, the clusters are relatively young, both 12.8 million years old.

There are more than 300 blue-white super-giant stars in each of the clusters.
The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s).
Their hottest main sequence stars are of spectral type B0.
NGC 884 includes five prominent red supergiant stars, all variable and all around 8th magnitude.

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Distribution of astrophotographers

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	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
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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
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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.

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NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

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Image Index:

Contribution Index (beta):

NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

NGC869 and NGC884 (h and X Persei), The Double Cluster in the constellation of Persus

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