20 Boötis

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20 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 19m 45.23479s[1]
Declination +16° 18′ 25.0136″[1]
Apparent magnitude (V) 4.85
Characteristics
Spectral type K3 III
U−B color index 1.4
B−V color index 1.23
R−I color index 0.6
Astrometry
Radial velocity (Rv) –7.64 km/s
Proper motion (μ) RA: –141.56[1] mas/yr
Dec.: +60.48[1] mas/yr
Parallax (π) 17.44 ± 0.22[1] mas
Distance 187 ± 2 ly
(57.3 ± 0.7 pc)
Absolute magnitude (MV) 1.01 ± 0.09[2]
Details
Mass 1.14 ± 0.19[2] M
Radius 11.3 ± 0.5[2] R
Surface gravity (log g) 2.36 ± 0.08[2] cgs
Temperature 4,472[2] K
Metallicity [Fe/H] 0.16[2] dex
Rotation 848 days[3]
Rotational velocity (v sin i) 1.0[3] km/s
Age 5.21 ± 2.28[2] Gyr
Other designations
HR 5370, HD 125560, BD+16°2637, FK5 3135, HIP 70027, SAO 100980, GC 19334.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

20 Boötis is a star in the constellation Boötes.

20 Boötis is an orange K-type giant with an apparent magnitude of +4.85. It is approximately 187 light years from Earth.

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 d e f g da Silva, L. et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105 
  3. ^ a b Setiawan, J. et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1 

External links[edit]