| Ursa Minor Dwarf | |
|---|---|
 Ursa Minor Dwarf | |
| Observation data (J2000epoch) | |
| Constellation | Ursa Minor |
| Right ascension | 15h 09m 08.5s[1] |
| Declination | +67° 13′ 21″[1] |
| Redshift | −247±1 km/s[1] |
| Distance | 200 ± 30kly (60 ± 10kpc)[2][3] |
| Apparent magnitude (V) | 11.9[1] |
| Characteristics | |
| Type | E[1] |
| Apparent size (V) | 30′.2 × 19′.1[1] |
| Notable features | Satellite galaxy of Milky Way |
| Other designations | |
| UGC 9749,[1]PGC 54074,[1]DDO 199,[1] UMi Dwarf[1] | |
TheUrsa Minor Dwarf is adwarf spheroidal galaxy, discovered by A.G. Wilson of theLowell Observatory, in the United States, during thePalomar Sky Survey in 1955.[4] It appears in theUrsa Minorconstellation, and is asatellite galaxy of theMilky 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 fromEarth.[5]
In 1999, Kenneth Mighell and Christopher Burke used theHubble Space Telescope to confirm that the Ursa Minor dwarf galaxy had a straightforward evolutionary history with a single burst ofstar formation that lasted around 2 billion years and took place around 14 billion years ago,[6] and that the galaxy was probably as old as the Milky Way itself.[7]
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Media related toUrsa Minor Dwarf Galaxy at Wikimedia Commons
