Cassiopeia Dwarf
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| Observation data: J2000 epoch | |
|---|---|
| Constellation: | Cassiopeia |
| Right ascension: | 23h 26m 31.0s[1] |
| Declination: | +50° 41′ 31″[1] |
| Redshift: | -307 ± 2 km/s[1] |
| Distance: | 2.58 ± 0.13 ly (790 ± 40 kpc)[2][3] |
| Type: | Sph?[1] |
| Apparent dimensions (V): | 2′.5 × 2′.0[1] |
| Apparent magnitude (V): | 12.9[1] |
| Notable features: | satellite galaxy of M31 |
| Other designations | |
| Andromeda VII[1], And VII,[4] Cas dSph,[4] Cassiopeia Dwarf Galaxy[4] |
|
| See also: Galaxy, List of galaxies | |
The Cassiopeia Dwarf (also known as Andromeda VII) is a dwarf spheroidal galaxy about 2.58 Mly away in the constellation Cassiopeia. The Cassiopeia Dwarf is part of the Local group of galaxies and a satellite galaxy of the Andromeda Galaxy (M32).
The Cassiopeia Dwarf was found in 1998, together with the Pegasus Dwarf, by a team of astronomers in Russia and the Ukraine. The Cassiopeia Dwarf and the Pegasus Dwarf are farther from M31 than its other known companion galaxies, yet still appear bound to it by gravity. Neither galaxy contains any young, massive stars or shows traces of recent star formation. Instead, both seem dominated by very old stars, with ages up to 10 billion years.
[edit] See also
[edit] External links
[edit] References
- ^ a b c d e f g NASA/IPAC Extragalactic Database. Results for Cassiopeia Dwarf. Retrieved on 2006-11-30.
- ^ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). "A Catalog of Neighboring Galaxies". Astronomical Journal 127: 2031-2068.
- ^ 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.
- ^ a b c SIMBAD Astronomical Database. Results for Andromeda V. Retrieved on 2006-11-30.
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