M71 (Jerome Proust)

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

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M71

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M71

M71 (ou NGC 6838) est un amas globulaire situé dans la constellation de la Flèche. Il a été observé pour la première fois par Philippe Loys de Chéseaux en 1745 ou 1746, puis redécouvert indépendamment par Johann Gottfried Koehler en 1771 ou 1772, et enfin par Pierre Méchain le 28 juin 1780. Charles Messier l'inclut dans son catalogue d'objets diffus après l'avoir lui-même observé le 4 octobre 1780. Comme pour la plupart des amas stellaires du catalogue Messier, William Herschel fut le premier à le résoudre en étoiles en 1783.

M71 est situé à approximativement 13 000 années-lumière du système solaire, et s'étend sur environ 27 années-lumière. L'amas ne contient que très peu d'étoiles variables (seules une dizaine ont été observées), aucune n'étant de type RR Lyrae, ce qui est plutôt rare pour un amas globulaire.

On a longtemps pensé que M71 était un amas ouvert très dense, mais un consensus semble s'être établi aujourd'hui pour dire qu'il s'agit en fait d'un amas globulaire très peu concentré, même si la question n'est pas totalement tranchée.

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.

Status	Basic success
Started	...
Astrometry.net job	351683
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

M71

M71

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