M 107 (Alberto Tomatis)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: M 107 · NGC 6171

M 107

M107 fu scoperto da Pierre Méchain nell'aprile del 1782 e poi indipendentemente riscoperto da William Herschel nel 1793 e dallo stesso Charles Messier; stranamente è stato poi poco osservato in epoche successive, perché considerato "di poca importanza". M107 è uno degli oggetti addizionali, che non esistevano nel Catalogo Messier originale: fu aggiunto da Hogg soltanto nel 1947; William Herschel, che ne fece una riscoperta indipendente, classificò quest'oggetto come H VI.40.

M107 è molto vicino al piano galattico e si trova ad una distanza di circa 20.900 anni luce dalla Terra; possiede un diametro apparente di 3 minuti d'arco, che corrisponde da un'estensione reale di circa 60 anni luce. Stranamente sembra contenere alcune bande oscure, del tutto insolite in un ammasso globulare; si tratta inoltre di uno degli ammassi globulari meno concentrati: è infatti classificato come di classe X su una scala di concentrazione da I a XII.

M 107 ha una velocità radiale di circa 147 km/s in avvicinamento e contiene 25 stelle variabili note.

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.

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

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