Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity (Randal Healey)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Erakis (μ Cep) · The star The Garnet Star

Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity, Randal Healey

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Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

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Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

The Garnet Star HD 206936, HIP 107259

Mu Cephei, referred to as the "garnet star" by Herschel in 1783, is thought to be the largest star visible to the naked eye. It is a red supergiant, spectral class M2 Ia, 15 times more massive than the Sun, but 1260-1650 times larger in diameter, and 2-4 billion times more voluminous than the Sun. If the star were placed into our Solar System its surface would extend between the orbits of Jupiter and Saturn. The star is known to be a semi-regular variable with apparent magnitude range 3.4 - 5.1, and a period around 2.5 years. It completed hydrogen to helium fusion, and is presently fusing helium into carbon. In the relatively near future, when it has converted its elements into iron, nuclear fusion will stop, and the star will undergo gravitational collapse resulting in a massive supernova explosion. Depending on the method used, distance estimates for the Garnet Star vary widely between 1,200 and 32,000 LY.

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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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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
Traveller
Own remote observatory
Amateur hosting facility
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.

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Astrometry.net job	5960699
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Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

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Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

Mu Cephe, The Garnet Star HIP 107259 and Surrounding Nebulosity

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