M 22 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: M 22 · NGC 6656

M 22

M 22 (noto anche come NGC 6656)

Fu probabilmente il primo ammasso globulare ad essere scoperto, M22 fu incluso nella lista di 6 oggetti pubblicata da Halley nel 1715

M22 è un oggetto notevole; dista circa 10.000 anni luce e quindi, il suo diametro angolare di 24' corrisponde a un diametro lineare di circa 65 anni luce. E' visibile ad occhio, perché è più brillante dell'ammasso globulare di Ercole M13 ed è meno luminoso di solo 2 magnitudini dell'ammasso globulare australi Omega Centauri (NGC 5139) e 47 Tucanae (NGC 104) (non compresi nel catalogo Messier) - questa è la classifica dei 4 ammassi globulari più brillanti del cielo.

M22 è uno degli ammassi globulari più vicini (distanza 10.000 anni luce). Shapley e Pease hanno contato in questo grande ammasso 70.000 stelle. Le stelle sono distribuite in una regione di circa 200 anni luce di diametro e si allontanano da noi a 144 km/sec. Le stelle più luminose sono di magnitudine 11

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	7350377
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M 22

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M 22

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