NGC 6633 (Chris Gifford)

Celestial hemisphere: Northern · Constellation: Ophiuchus (Oph) · Contains: HD168797 · HD168931 · HD168961 · HD169006 · HD169032 · HD169113 · HD169578 · HD169618 · HD169669 · HD169689 · HD169723 · HD169822 · HD169844 · HD169889 · HD169957 · HD170009 · HD170011 · HD170053 · HD170054 · HD170095 · HD170113 · HD170134 · HD170157 · HD170200 · HD170201 · HD170291 · HD170316 · HD170512 · HD170699 · HD170780 · And 10 more.

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NGC 6633

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NGC 6633

NGC 6633 is a large bright open cluster in the constellation Ophiuchus. Discovered in 1745-46 by Philippe Loys de Chéseaux, it was independently rediscovered by Caroline Herschel in 1783 and included in her brother William's catalog as H VIII.72. Bright enough to be seen with the naked eye, the cluster is considered a fine object for binoculars or small telescopes.

NGC 6633 is also known as the Tweedledum Cluster (paired with IC 4756 as Tweedledee), also as the Captain Hook Cluster. It is also designated Collinder 380 or Melotte 201. Nearly as large as the full moon, the cluster contains 38 known stars and shines with a total magnitude of 4.6; the brightest star is of mag 7.6. Its age has been estimated at 660 million years.

The cluster contains at least one chemically peculiar star - NGC 6633 48 (BD+06 3755).

The 8th-magnitude binary star HD 169959 (NGC 6633 58) is within the line-of-sight of the open cluster but is not physically associated with it.

Original
Final
B

All
Open Clusters

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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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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.

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	7613430
PixInsight job	C3N91HUMOB29WYCHF1GYFSZY43XUYFYE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h27m09s.63
RA (top/left)	18h20m53s.59
RA (top/right)	18h21m07s.60
RA (bottom/right)	18h33m22s.32
RA (bottom/left)	18h33m14s.26

Dec (center)	+06°30′22″.8
Dec (top/left)	+08°46′19″.9
Dec (top/right)	+04°12′08″.8
Dec (bottom/right)	+04°13′43″.8
Dec (bottom/left)	+08°48′07″.6

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NGC 6633

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