Ursa Minor Dwarf

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Ursa Minor Dwarf
Observation data (J2000 epoch)
Constellation Ursa Minor constellation
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]
See also: Galaxy, List of galaxies

The Ursa Minor Dwarf dwarf elliptical galaxy was discovered by A.G. Wilson of the Lowell Observatory in 1954. 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.

[edit] Evolutionary history

In 1999, Mighell & Burke used the Hubble Space Telescope to confirm that the UMi system had a straight forward evolutionary history with a single ~2 Gyr long burst of star formation around 14 Gyr ago.[4]

[edit] See also

[edit] References

  1. ^ a b c d e f g h i j NASA/IPAC Extragalactic Database. Results for Ursa Minor Dwarf. Retrieved on 2006-11-29.
  2. ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127: 2031–2068. doi:10.1086/382905. 
  3. ^ Karachentsev, I. D.; Kashibadze, O. G. (2006). "Masses of the local group and of the M81 group estimated from distortions in the local velocity field". Astrophysics 49 (1): 3–18. doi:10.1007/s10511-006-0002-6. 
  4. ^ van den Bergh, Sidney (April 2000), “Updated Information on the Local Group”, The Publications of the Astronomical Society of the Pacific 112 (770): 529-536, <http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2000PASP..112..529V> 
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