M 103 - Open Cluster in Cassiopeia (Monty Chandler)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD236783 · HD236789 · HD9145 · HD9146 · HD9311 · HD9365 · HD9518 · M 103 · NGC 581

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M 103 - Open Cluster in Cassiopeia

Link: https://montychandler.smugmug.com/Astrophotography/The-Heavans/i-jdR2m8r/A

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M 103 - Open Cluster in Cassiopeia

Link: https://montychandler.smugmug.com/Astrophotography/The-Heavans/i-jdR2m8r/A

Messier 103 (M 103) is a small open star cluster in the northern constellation Cassiopeia. It's about 9,000 light-years from Earth and is one of the smallest and most remote open clusters known. It contains 172 confirmed members.

The brightest stars in the cluster have a visual magnitude of 10.5 and belong to spectral classes B5 Ib and B2 III, which means that they are a supergiant and giant star, both white-blue in color. Most of the cluster’s brightest members are young, hot, blue stars. At the centre of the cluster, there is a prominent red giant with a visual magnitude of 10.8. The star is classified as belonging to the spectral class M6 III or gM6.

Messier 103 is moving toward us at 37 km/s. The estimated age of the cluster is about 25 million years, only 30 percent of the age of the Pleiades (M45).

M103 occupies an area 6 arc minutes in apparent size, corresponding to a linear diameter of 17.5 light years. It is easy to see, even with binoculars, and appears as a nebulous fan-shaped patch. 4-inch telescopes resolve the four brightest stars in the cluster. Large telescopes resolve more stars across the cluster, but make it harder to make out M103 from the surrounding star field because the cluster is quite loose.

This image is from an 8" telescope and the rich star-field is very apparent, but the bright blue stars from M 103 stand out to me, as does the red giant in the center.

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	8779743
PixInsight job	QEW20F6H4ZRBBOMOJBR90U3O31YBTWAV
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h33m26s.814
RA (top/left)	01h35m37s.614
RA (top/right)	01h35m36s.831
RA (bottom/right)	01h31m12s.715
RA (bottom/left)	01h31m19s.945

Dec (center)	+60°38′57″.88
Dec (top/left)	+60°14′45″.41
Dec (top/right)	+61°03′22″.00
Dec (bottom/right)	+61°03′02″.30
Dec (bottom/left)	+60°14′26″.91

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M 103 - Open Cluster in Cassiopeia

M 103 - Open Cluster in Cassiopeia

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M 103 - Open Cluster in Cassiopeia

M 103 - Open Cluster in Cassiopeia

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