2 Ursae Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 01h 08m 44.88s[1] |
| Declination | 86° 15′ 25.5″[1] |
| Apparent magnitude (V) | 4.24 |
| Characteristics | |
| Spectral type | K2 II-III |
| Astrometry | |
| Proper motion (μ) | RA: 80.65 ± 0.16[1] mas/yr Dec.: -11.54 ± 0.17[1] mas/yr |
| Parallax (π) | 11.64 ± 0.15[1] mas |
| Distance | 280 ± 4 ly (86 ± 1 pc) |
| Details | |
| Mass | 2.27 ± 0.41[2] M☉ |
| Luminosity | 183 ± 20[2] L☉ |
| Temperature | 4,549[2] K |
| Other designations | |
2 Ursae Minoris (2 UMi) is a 4.24m orange giant star (spectral class K2II-III) near the northern celestial pole (RA: 01h 08m 44.88s, Dec: +86° 15′ 25.5″). Despite its Flamsteed designation, the star is actually located in the constellation Cepheus. This occurred when the constellation boundaries were changed in 1930 by Eugene Delporte. Therefore, the star is usually referred only by its catalog numbers such as HR 285 or HD 5848.
References
- 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. - 1 2 3 Stello, D.; et al. (2008), "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses", The Astrophysical Journal Letters, 674 (1): L53–L56, arXiv:0801.2155, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936.
- ↑ SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2007-01-04.
External links
This article is issued from Wikipedia - version of the 10/30/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.