2 Ursae Minoris

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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
HD 5848, HIP 5372, HR 285.[3]

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 is because of changes in constellation borders. Therefore the star is usually referred only by its catalog numbers such as HR 285 or HD 5848.

References[edit]

  1. ^ a b c d e 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. 
  2. ^ a b c 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. 
  3. ^ SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2007-01-04. 

External links[edit]