M3 (Jerome Proust)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: M 3 · NGC 5272

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M3

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M3

M3 est un amas globulaire situé dans la constellation des Chiens de chasse. La magnitude apparente de l'amas est de 6,3, celui-ci est donc situé juste au-dessus de la limite théorique de visibilité à l'œil nu. M3 est un objet du catalogue Messier.

L'objet a été découvert en 1764 par Charles Messier et fut résolu pour la première fois en étoiles par William Herschel vers 1784. La première étoile variable de l'amas fut découverte en 1889 par Pickering. En 1953, Allan Sandage découvrit des étoiles bleues dans l'amas.

L'amas est l'un des plus importants par le nombre d'étoiles : il en compterait pas moins d'un demi million. La taille de l'amas est d'environ 160 années-lumière. De tous les amas connus, M3 est celui qui contient le plus d'étoiles variables : pas moins de 210 ont été recensées. La détermination de la période de certaines de ces étoiles, les céphéides, a permis de nous faire une idée précise de la distance de l'amas (34 000 années-lumière).

La plupart des étoiles de l'amas sont âgées de 10 milliards d'années mais il contient un nombre assez élevé d'étoiles bleues, donc jeunes.

M3 est certainement l'un des plus beaux objets à observer dans un instrument d'amateur. L'amas est repérable aux jumelles et se présente alors comme une tache blanchâtre et diffuse. Il suffit pour cela d'observer la zone située à mi-chemin entre α Bootis (Arcturus) du Bouvier et α2 Canum Venaticorum (Cor Caroli) des Chiens de chasse. Un télescope de 114 mm permet de distinguer le noyau brillant du pourtour de l'amas de plus faible luminosité. Un télescope de 150 mm permet de résoudre la plupart des étoiles périphériques de l'amas. La vision devient féerique avec un instrument de 200 mm.

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	6465667
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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