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 6.95 mas as seen from Earth,[1] this system is located roughly 470 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 times the mass of the Sun and is radiating 89 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,439 K.[6]

For other stars with this Bayer designation, see ξ Capricorni.
Xi1 Capricorni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension  20h 11m 57.89825s[1]
Declination −12° 23′ 32.6515″[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: −7.99[1] mas/yr
Dec.: −18.65[1] mas/yr
Parallax (π)6.95 ± 0.47[1] mas
Distance470 ± 30 ly
(144 ± 10 pc)
Absolute magnitude (MV)+0.56[5]
Details[6]
Mass1.55 M☉
Luminosity89 L☉
Temperature4,439±42 K
Age3.35 Gyr
Other designations
ξ1 Cap, 1 Cap, BD−12° 5664, GC 28026, HD 191753, HIP 99529, HR 7712, SAO 163328[7]
Database references
SIMBADdata

References
  1. van Leeuwen, F. (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. 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.
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