Melotte 15 in IC1805 (KuriousGeorge)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD15558 · HD15570 · HD15629 · IC 1805 · LBN 654 · LDN 1367 · LDN 1368 · LDN 1369 · Sh2-190

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Melotte 15 in IC1805

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Melotte 15 in IC1805

Used Hubble Palette.

This bright star cluster is known as Melotte15 after its discover, Philibert Jacques Melotte (1880-1961).

Melotte 15 is embedded within and illuminates the central portion of the much larger glowing nebula identified as IC 1805 (Heart Nebula).

The three bright stars in an arc are type "O" stars which are the brightest and most massive stars known. Type O stars are also the shortest lived. While the Sun, a type "G" star, will happily burn its hydrogen fuel for 10 billion years or more, type O stars burn through their much more massive amount of fuel [typically type O stars are 20 to 100 times more massive than our sun] in as short as 3 to 6 million years. A very short lifespan as far as stars go.

Type O stars then end their lives in a spectacular Type II supernova which spreads the elements generated in the core of the star throughout the stellar neighborhood.

This interesting structure is a giant area of hydrogen gas that is caused to glow by the intense ultraviolet radiation from the massive stars of the Melotte 15 star cluster. It is estimated that this illuminated gas is more than 50 light years from the Melotte15 stars.

The Melotte 15 star cluster is estimated to be 7,500 light years away from Earth.

Images from the EdgeHD Series
Schmidt-Cassegrain Telescope (SCT) Imagers

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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
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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

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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.

Status	Advanced success
Started	...
Astrometry.net job	6050737
PixInsight job	XJKP35O8HPM7YZVU2ANNPJVL20TFDK1E
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h33m19s.619
RA (top/left)	02h34m55s.415
RA (top/right)	02h31m39s.138
RA (bottom/right)	02h31m45s.508
RA (bottom/left)	02h34m58s.760

Dec (center)	+61°24′11″.77
Dec (top/left)	+61°38′58″.22
Dec (top/right)	+61°38′30″.34
Dec (bottom/right)	+61°09′20″.52
Dec (bottom/left)	+61°09′48″.26

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Melotte 15 in IC1805

Melotte 15 in IC1805

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Melotte 15 in IC1805

Melotte 15 in IC1805

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