M71 (Robert.S) - AstroBin

Celestial hemisphere: Northern · Constellation: Sagitta (Sge) · Contains: M 71 · NGC 6838

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M71

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M71

Swiss astronomer Jean-Philippe Loys de Chéseaux discovered M71 in1746. The nature of M71 has been the subject of some questioning. Over the centuries, it has been classified as both an abnormally dense open star cluster and as an unusually loose globular cluster. Because M71 does not seem to have a high concentration of stars at its center, and because the elemental composition of the stars it contains suggests that they are younger than most globular clusters, M71 was initially believed to be an open cluster. In the 1970s, astronomers examined the relationship between the brightness's and temperatures of the stars in the cluster. They found a characteristic trend among the stellar population that is unique to globular clusters, so M71 was reclassified as a young, loosely concentrated globular cluster, the smallest of its kind. The color-composite view of M71 is now known to be 10 billion years old.

Original
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Final
E

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
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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
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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
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Professional, scientific grade data
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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.

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