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Ursa Minor Dwarf

Ursa Minor Dwarf
Observation data (J2000 epoch)
Constellation Ursa Minor
Right ascension 15h 09m 08.5s
Declination +67° 13′ 21″
Redshift -247 ± 1 km/s
Distance 200 ± 30 kly (60 ± 10 kpc)
Apparent magnitude (V) 11.9
Characteristics
Type E
Apparent size (V) 30′.2 × 19′.1
Notable features Satellite galaxy of Milky Way
Other designations
UGC 9749,PGC 54074,DDO 199, UMi Dwarf
See also: Galaxy, List of galaxies

The Ursa Minor Dwarf is a dwarf spheroidal galaxy, discovered by A.G. Wilson of the Lowell Observatory, in the United States, during the Palomar Sky Survey in 1955. It appears in the Ursa Minor constellation, and is a satellite galaxy of the Milky Way. The galaxy consists mainly of older stars and seems to house little to no ongoing star formation. Its centre is around 225,000 light years distant from Earth.

In 1999, Kenneth Mighell and Christopher Burke used the Hubble Space Telescope to confirm that the Ursa Minor dwarf galaxy had a straightforward evolutionary history with a single burst of star formation that lasted around 2 billion years and took place around 14 billion years ago, and that the galaxy was probably as old as the Milky Way itself.

Coordinates: Sky map15h 09m 08.5s, +67° 13′ 21″


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