Eta Ursae Minoris
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| 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 of spectral type F5V with an apparent magnitude of +4.95,[2] making it visible to the naked eye.[3] It is approximately 97 light years from Earth.[2]
This star has 1.41 times the mass of the Sun, with a projected rotational velocity of 76.0 km s−1.[1]
References
- ^ 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
- ^ a b SIMBAD, Eta Ursae Minoris (accessed 30 July 2014)
- ^ Kaler, James B. "Anwar al Farkadain". Stars. University of Illinois. Retrieved 21 June 2014.
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