Upsilon Boötis

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υ Boötis
Diagram showing star positions and boundaries of the Boötes constellation and its surroundings
Cercle rouge 100%.svg

Location of υ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 13h 49m 28.64s[1]
Declination +15° 47′ 52.5″[1]
Apparent magnitude (V) 4.053
Spectral type K5.5III
U−B color index 1.87
B−V color index 1.52
R−I color index 0.87
Variable type Variable star
Radial velocity (Rv) -5.6 km/s
Proper motion (μ) RA: -94.22 ± 0.19[1] mas/yr
Dec.: 41.07 ± 0.14[1] mas/yr
Parallax (π) 12.38 ± 0.23[1] mas
Distance 263 ± 5 ly
(81 ± 2 pc)
Mass 1.11 ± 0.33[2] M
Luminosity 332 ± 54[2] L
Temperature 3,920[2] K
Other designations
5 Boötis, BD+16°2564, HD 120477, HIP 67459, HR 5200, SAO 100725.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Upsilon Boötis (υ Boo, υ Boötis) is a star in the constellation Boötes.

Upsilon Boötis is an orange K-type giant with an apparent magnitude of +4.05. It is approximately 263 light years from Earth.[1]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, 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:0801.2155free to read, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936. 

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