The Draco Dwarf - UGC10822 (Massimo Di Fusco)

The Draco Dwarf - UGC10822

The Draco Dwarf, also known as UGC 10822, is a spheroidal galaxy discovered by Albert George Wilson in 1954 by analyzing photographic plates from the National Geographic Society's Palomar Observatory Sky Survey (POSS). It is part of the Local Group and is a satellite galaxy of the Milky Way at an estimated distance of 260000 light years from Earth.
The Draco Dwarf Galaxy contains primarily an ancient population of stars and an insignificant amount of interstellar matter (being essentially dust-free). From 75% to 90% of its stars formed more than 10 billion years ago and its central region shows a concentration of more metal-rich stars.
Recently, dwarf spheroid galaxies have become key objects for studying dark matter, and UGC10822 is one of those that has received special attention. Calculations of the radial velocity of this galaxy have revealed a large internal velocity dispersion giving a mass/luminosity ratio of up to 440 M☉/L☉, suggesting large amounts of dark matter. It has been hypothesized that the large velocity dispersions could be explained as tidal dwarfs (virtually unbound stellar streams from dwarf galaxies disrupted by the Milky Way). However, the narrow horizontal branch width of UGC10822 does not support this pattern. This leaves only the dark matter explanation and makes the Draco Dwarf the most dark matter-dominated object known.

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Status	Advanced success
Started	...
Astrometry.net job	9759897
PixInsight job	84021Y1K3VXTGP5UFPKUEF0Q23R2UDTF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h20m06s.144
RA (top/left)	17h23m40s.102
RA (top/right)	17h16m37s.957
RA (bottom/right)	17h16m36s.294
RA (bottom/left)	17h23m30s.399

Dec (center)	+57°53′44″.87
Dec (top/left)	+58°13′23″.51
Dec (top/right)	+58°14′26″.77
Dec (bottom/right)	+57°33′44″.98
Dec (bottom/left)	+57°32′43″.70

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The Draco Dwarf - UGC10822

The Draco Dwarf - UGC10822

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The Draco Dwarf - UGC10822

The Draco Dwarf - UGC10822

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