Open Cluster NGC 6231 in Scorpius (Paulo Cacella)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: NGC 6231

Open Cluster NGC 6231 in Scorpius

NGC 6231 (Chinese: 神宮; pinyin: Shéngōng), also known as the Northern Jewel Box, is an open cluster located near Zeta Scorpii. Zeta1 (HR 6262) is a member of this star cluster. (Its brighter apparent partner, Zeta2 (HR 6271), is only 150 ly from Earth and so is not a cluster member.)

This cluster is estimated about 3.2 million years old, and is approaching the Solar System at 22 km/s. The cluster belongs to the young Scorpius OB1 association. Zeta1 Scorpii (spectral type O8 and magnitude 4.71.[1]) is the brightest star in the association, and one of the most radiant stars known in the galaxy.[2]

NGC 6231 also includes three Wolf-Rayet stars: HD 151932, HD 152270,[3] and HD 152408.[4]

The cluster was discovered by Giovanni Batista Hodierna before 1654. Hodierna listed it as Luminosae[5] in his catalogue of deep sky observations. This catalogue was included in his book De Admirandis Coeli Characteribuse published in 1654 at Palermo. It was independently observed by other astronomers after Hodierna.

1678 Edmond Halley

1745-46　de Chéseaux

1751-52　Lacaille

The cluster forms the head of the "false comet", the tail being the dimmer cluster Trumpler 24 extending to the north, also part of the Scorpius OB1 association.

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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
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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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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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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.

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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 failed
Started	...
Astrometry.net job	664833
PixInsight job	C19JP81CJ688NJ80LUS7CAM2FDRX5I3C
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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Open Cluster NGC 6231 in Scorpius

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Open Cluster NGC 6231 in Scorpius

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