20 Boötis

20 Boötis

Observation data Epoch J2000      Equinox J2000
Constellation	Boötes
Right ascension	14^h 19^m 45.23479^s[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

1. 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. 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. 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

• HR 5370
• Image 20 Boötis