Eta Ursae Minoris
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This article needs additional citations for verification. (December 2009) |
 Merak in Ursa Major. |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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| Constellation | Ursa Minor |
| Right ascension | 16h 17m 30.3s |
| Declination | +75° 45' 19" |
| Apparent magnitude (V) | +4.95 |
| Absolute magnitude (V) | +2.61[1] |
| Distance | 97.3 ± 1.4 ly (29.8 ± 0.4 pc) |
| Spectral type | F5 V |
| Other designations | |
Eta Ursae Minoris (η UMi, η Ursae Minoris) is a star in the constellation Ursa Minor. It has the traditional names Anwar al Farkadain and Alasco[citation needed]. The first is from the Arabic أنور الفرقدين ’anwar al-farqadayn "the brighter of the two calves", as opposed to Ahfa al Farkadain (ζ UMi) "the dimmer of the two calves"[citation needed]; these names were originally applied to Kochab, and Pherkad, respectively, the other two stars in the rectangle of Ursa Minor.
Eta Ursae Minoris is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.95, making it visible to the naked eye. It is approximately 97.3 light years from Earth.
This star has 1.41 times the mass of the Sun, with a projected rotational velocity of 76.0 km s−1.[1]
References [edit]
- ^ a b Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics 361: 614–628, Bibcode:2000A&A...361..614P
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