Ursa Minor Dwarf
| Ursa Minor Dwarf | |
|---|---|
| Observation data (J2000 epoch) | |
| Constellation | Ursa Minor |
| Right ascension | 15h 09m 08.5s[1] |
| Declination | +67° 13′ 21″[1] |
| Redshift | -247 ± 1 km/s[1] |
| Distance | 200 ± 30 kly (60 ± 10 kpc)[2][3] |
| Type | E[1] |
| Apparent dimensions (V) | 30′.2 × 19′.1[1] |
| Apparent magnitude (V) | 11.9[1] |
| Notable features | Satellite galaxy of Milky Way |
| Other designations | |
| UGC 9749,[1] PGC 54074,[1] DDO 199,[1] UMi Dwarf[1] | |
The Ursa Minor Dwarf dwarf spheroidal galaxy was discovered by A.G. Wilson of the Lowell Observatory in the Palomar Sky Survey in 1955.[4] It is part of the Ursa Minor constellation, and a satellite galaxy to the Milky Way. The galaxy consists mainly of older stars and there appears to be little to no ongoing star formation in the Ursa Minor Dwarf galaxy. Its centre is around 225,000 light years distant from Earth.[5]
Evolutionary history
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,[6] and that the galaxy was probably as old as the Milky Way itself.[7]
See also
References
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- The Ursa Minor Dwarf on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
| Location |
Milky Way → Milky Way subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
Each arrow (→) may be read as "within" or "part of". |
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| Galactic core | |||||||||
| Spiral arms | |||||||||
| Satellite galaxies |
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Coordinates: 
15h 09m 08.5s, +67° 13′ 21″
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