Ursa Major I Dwarf
Ursa Major I Dwarf | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Ursa Major |
Right ascension | 10h 34m 52.8s[1] |
Declination | +51° 55′ 12″[1] |
Distance | 330,000 light-years (100 kpc)[2] |
Characteristics | |
Type | dSph |
Other designations | |
UMa I dwarf,[1] Ursa Major I dSph[1] |
Ursa Major I Dwarf (UMa I dSph) is a dwarf spheroidal galaxy that orbits the Milky Way galaxy. It was discovered in 2005 within the Ursa Major constellation and is the third least luminous known galaxy.
Discovery
It was discovered by Beth Willman, Julianne J. Dalcanton, David Martinez-Delgado, and Andrew A. West in 2005.[2]
Properties
Being a small
It estimated to be located at a distance of about 330,000 light-years (100 kpc) from the Earth.[2] That is about twice the distance to the Large Magellanic Cloud; the largest and most luminous satellite galaxy of the Milky Way.
Related objects
There was another object called "Ursa Major Dwarf", discovered by Edwin Hubble in 1949.[3] It was designated as Palomar 4. Due to its peculiar look, it was temporarily suspected to be either a dwarf spheroidal or elliptical galaxy. However, it has since been found to be a very distant (about 360,000 ly) globular cluster belonging to our galaxy.
The Ursa Major II Dwarf was discovered in 2006 in the Ursa Major constellation and is also extraordinarily dim.
See also
References
- ^ a b c d "NASA/IPAC Extragalactic Database". Results for Ursa Major dSph. Retrieved 2006-11-27.
- ^ S2CID 14851943.
- ^ "Ursa Major Dwarf, Palomar 4". Milky Way Globular Clusters. Archived from the original on April 8, 2005. Retrieved April 16, 2005.