Xi¹ Capricorni

Xi¹ Capricorni, Latinized from ξ¹ Capricorni, is an orange-hued star in the constellation Capricornus. With an apparent visual magnitude of +6.34,[2] it is near the lower limit of brightness for stars that can be seen with the naked eye. Based upon an annual parallax shift of 5.26 mas as seen from Earth,[1] this system is located roughly 620 light years from the Sun. It is an evolved K-type giant star with a stellar classification of K0 III.[3] With an age of 3.35 billion years, this star has an estimated 1.55[6] times the mass of the Sun and is radiating 139[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,439 K.[6]

Xi¹ Capricorni

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Capricornus
Right ascension	20^h 11^m 57.89778^s[1]
Declination	−12° 23′ 32.6484″[1]
Apparent magnitude (V)	+6.34[2]
Characteristics
Spectral type	K0 III[3]
B−V color index	+1.21[2]
Astrometry
Radial velocity (Rv)	+0.9[4] km/s
Proper motion (μ)	RA: −8.004[1] mas/yr Dec.: −18.202[1] mas/yr
Parallax (π)	5.2607 ± 0.0577[1] mas
Distance	620 ± 7 ly (190 ± 2 pc)
Absolute magnitude (MV)	+0.56[5]
Details
Mass	1.55[6] M☉
Radius	18.88+0.72 −0.95[1] R☉
Luminosity	139.096+2.027 −2.027[1] L☉
Temperature	4,439±42[6] K
Age	3.35[6] Gyr
Other designations
ξ^1 Cap, 1 Cap, BD−12° 5664, GC 28026, HD 191753, HIP 99529, HR 7712, SAO 163328[7]
Database references
SIMBAD	data

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
3. Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
4. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institution for Science, Bibcode:1953GCRV..C......0W, LCCN 54001336.
5. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
6. Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
7. "ksi01 Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-31.