Open Cluster NGC 6633 in Ophiuchus (Tom Wildoner)

Celestial hemisphere: Northern · Constellation: Ophiuchus (Oph) · Contains: HD170011 · HD170053 · HD170054 · HD170095 · HD170134 · HD170157 · HD170200 · HD170201 · HD170291 · NGC 6633

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Open Cluster NGC 6633 in Ophiuchus

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Open Cluster NGC 6633 in Ophiuchus

NGC 6633 is a large bright open cluster in the constellation Ophiuchus. 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.

Observation data (J2000.0 epoch)
Right ascension: 18h 27.7m
Declination: 6° 34′
Apparent magnitude (V): 4.6
Apparent dimensions (V): 27’

Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO ASI2600MC camera running at 0F, 54x60 seconds guided exposures, Sky-Watcher EQ6R-Pro pier mounted, ZWO EAF and ASIAir Pro, processed in DSS and PixInsight. Image Date: August 18, 2023. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).

Open Star Clusters

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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	8401942
PixInsight job	W2MCNDJ0R4COQMWIWFLNWHWZAAQPKWZL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h27m22s.892
RA (top/left)	18h29m32s.401
RA (top/right)	18h29m25s.921
RA (bottom/right)	18h25m13s.110
RA (bottom/left)	18h25m20s.700

Dec (center)	+06°30′46″.48
Dec (top/left)	+05°44′28″.59
Dec (top/right)	+07°18′14″.63
Dec (bottom/right)	+07°17′02″.12
Dec (bottom/left)	+05°43′13″.83

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Open Cluster NGC 6633 in Ophiuchus

Open Cluster NGC 6633 in Ophiuchus

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Open Cluster NGC 6633 in Ophiuchus

Open Cluster NGC 6633 in Ophiuchus

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