M 2 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: M 2 · NGC 7089

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M 2

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M 2

M2 Individuato per la prima volta da Giovanni Domenico Maraldi l'11 settembre 1746, mentre stava osservando la cometa di De Chéseaux, fu riscoperto più tardi in modo indipendente da Charles Messier, esattamente 14 anni dopo, l'11 settembre 1760. Messier lo descrisse nel suo catalogo come:"Nebulosa senza stelle nella testa dell'Aquario, il centro è brillante, e la luce che l’avvolge è rotonda.

William Herschel fu il primo a risolvere la sua composizione stellare, paragonandolo a un pugno di sabbia finissima.

M2 dista 37.500 anni luce dal Sole e circa 33.500 anni luce dal centro della Via Lattea. Ha un diametro pari a 175 anni luce e una notevole ellitticità (tipo E1); contiene all'incirca 150.000 stelle, ed è uno dei più ricchi e compatti ammassi globulari.

La magnitudine assoluta dell'ammasso è pari a -9,02, 500.000 volte più luminoso del Sole, che alla stessa distanza apparirebbe come una stella di magnitudine 20,7

Le stelle più brillanti di M2 sono giganti rosse e gialle di magnitudine 13,1, mentre le sue stelle di braccio orizzontale hanno una luminosità apparente di 16,1.

Studiando il suo diagramma colore-magnitudine, Halton Arp (1962) stimò l'età di M2 in circa 13 miliardi di anni, all'incirca la stessa degli ammassi globulari M3 e M5.

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	6686792
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M 2

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Image Index:

Contribution Index (beta):

M 2

M 2

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