M104 Galassia Sombrero (Raffaele Lunari)

Celestial hemisphere: Southern · Constellation: Virgo (Vir) · Contains: M 104 · NGC 4594 · Sombrero galaxy

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M104 Galassia Sombrero

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M104 Galassia Sombrero

La Galassia Sombrero (conosciuta anche con le sigle M 104 o NGC 4594) è una galassia nella costellazione della Vergine ma la sua distanza è stimata sui circa 29 milioni di anni luce da noi, ed è quindi più vicina dell'Ammasso della Vergine, del quale non è considerata un membro. Ha una magnitudine apparente di 8 (integrata sull'intera superficie), ed ha un tipo Sa oppure Sb. È invisibile ad occhio nudo ma visibile già con piccoli telescopi. Ha un diametro apparente pari a circa un quinto della Luna piena, ma occorrono grandi telescopi oppure fotografie a lunga posta per vedere le parti più deboli.

Il diametro di M104 è stimato in modo differente da vari astronomi: da 50.000 a 140.000 anni luce. Secondo il sito del telescopio spaziale Hubble,[4] il diametro di M104 è di 50.000 anni luce e la sua massa è pari a 800 miliardi di masse solari. Ha un nucleo grande e luminoso, un bulge centrale stranamente grande, e una prominente banda di polveri attorno al disco. Poiché si mostra di taglio, l'aspetto complessivo è simile ad un sombrero messicano, da cui il nome assegnatole.

Questa galassia ha anche un sistema di ammassi globulari ben popolato, con almeno alcune centinaia di membri visibili ai grandi telescopi, e una popolazione totale stimata di almeno 2000 oggetti, molti di più di quelli della Via Lattea. Foto recenti hanno mostrato che M104 ha un alone galattico molto esteso.

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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	1565520
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M104 Galassia Sombrero

M104 Galassia Sombrero

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M104 Galassia Sombrero

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