M 13 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: Hercules Globular Cluster · M 13 · NGC 6205

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M 13

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M 13

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M13

Costellazione di Ercole

Messier 13 (M13, NGC 6205), chiamato anche il 'Grande ammasso globulare di Ercole', è uno dei più importanti e più noti ammassi globulari dell'emisfero settentrionale celeste.

E 'stato scoperto da Edmond Halley nel 1714, il quale ha osservato che 'si può vedere ad occhio nudo, quando il cielo è sereno e la luna assente.' Charles Messier, lo catalogata il 1 ° giugno 1764, ed è riportato anche in John Bevis' "Inglese" Celestial Atlas.

Distante 25100 anni luce, il suo diametro angolare di 20 ' che corrisponde ad una ldimenzione 145 anni luce - visivamente, è circa 13'. Esso contiene più di 100.000 stelle, Timothy Ferris, nel suo libro Galassie dice anche "più di un milione". Verso il suo centro, le stelle sono circa 500 volte più concentrate del sistema solare. L'età di M13 è stata determinata da Sandage di 24 miliardi di anni e da Arp, di 17 miliardi anni intorno al 1960; Arp più tardi (nel 1962) ha rivisto il suo valore a 14 miliardi di anni (preso da Kenneth Glyn Jones).

M13 ammasso globulare è stato selezionato nel 1974 come obiettivo per il uno dei primi messaggi radio indirizzati ad eventuali extra-terrestri razze intelligenti, e inviato via radio dal grande radiotelescopio dell'Osservatorio di Arecibo.

Nelle vicinanze, a circa 40 minuti d'arco a nord-est di M13, è la debole (mag 11) galassia NGC 6207, visibile in molte riprese di grandi e medie dimensioni. Questa galassia ha recentemente prodotto una supernova di tipo II.

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
Artificial satellite

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.

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