Alpha Gruis and NGC7213 (Geoff Healey)

Celestial hemisphere: Southern · Constellation: Grus (Gru) · Contains: Al Na'ir (α Gru) · NGC 7213 · The star Alnair

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Alpha Gruis and NGC7213

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Alpha Gruis and NGC7213

Alnair, Alpha Gruis (α Gru), is a blue-white main sequence star located in the constellation Grus. With an apparent magnitude of 1.74, it is the brightest star in Grus and the 30th brightest star in the sky. Alnair has four times the Sun’s mass and a radius 3.4 times solar. With a temperature of 13,920 K, it shines with 520 solar luminosities. The star is a very fast spinner, with a projected rotational velocity of 215 km/s at the equator. It completes a rotation in less than a day. Alnair’s estimated age is 100 million years. It lies about 101 light years away.

The much further away NGC7213 is a lenticular galaxy located in the constellation Grus. It is located at a distance of circa 70 million light-years from Earth, which, given its apparent dimensions, means that NGC 7213 is about 75,000 light-years across. It was discovered by John Herschel on September 30, 1834. It is an active galaxy with characteristics between a type I Seyfert galaxy and LINER. Courtesy Wiki.

The never ending clouds of Melbourne restricted the amount of data I could collect.

Please note: The following tables are updated every 24 hours.

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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Alpha Gruis and NGC7213

Alpha Gruis and NGC7213

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Alpha Gruis and NGC7213

Alpha Gruis and NGC7213

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