HD 100825

HD 100825 is a single[7] star in the southern constellation of Centaurus. It has the Bayer designation C2 Centauri, while HD 100825 is the identifier from the Henry Draper catalogue. The star has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.26.[2] It is located at a distance of 187 light years from the Sun based on parallax, with an absolute magnitude of +1.31.[2] The radial velocity is poorly constrained, but the star appears to be drifting further away from the Sun at the rate of around 5 km/s.[2] It is a member of the Sirius supercluster of co-moving stars.[8]

This article is about C2 Centauri. For c2 Centauri, see HD 129685. For other stars with this Bayer designation, see C Centauri.
C2 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension  11h 35m 55.58452s[1]
Declination −47° 38′ 29.9009″[1]
Apparent magnitude (V) +5.26[2]
Characteristics
Spectral type F0V[3] or A7m[4]
B−V color index +0.257±0.003[2]
Astrometry
Radial velocity (Rv)+5.2±2.8[2] km/s
Proper motion (μ) RA: +33.897[1] mas/yr
Dec.: −49.629[1] mas/yr
Parallax (π)17.3990 ± 0.1049[1] mas
Distance187 ± 1 ly
(57.5 ± 0.3 pc)
Absolute magnitude (MV)+1.31[2]
Details
Mass1.62[5] M☉
Radius2.67[1] R☉
Luminosity20.846[1] L☉
Surface gravity (log g)3.97±0.14[5] cgs
Temperature7,737±263[5] K
Age467[5] Myr
Other designations
C2 Cen, CD−46°7205, FK5 435, GC 15901, HD 100825, HIP 56573, HR 4466, SAO 222895[6]
Database references
SIMBADdata

This is an Am star[4] or metallic-line star with a stellar classification of F0V,[3] indicating it is a F-type main-sequence star that is generating energy by core hydrogen fusion. It is an estimated 467[5] million years old and has 1.62[5] times the mass of the Sun. The star is radiating 21 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,737 K.[5]

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. 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.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. Malaroda, S. (August 1975), "Study of the F-type stars. I. MK spectral types", Astronomical Journal, 80: 637–641, Bibcode:1975AJ.....80..637M, doi:10.1086/111786.
  5. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  6. "HD 100825". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-01.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  8. Eggen, Olin J. (1992), "The Sirius supercluster in the FK5", Astronomical Journal, 104 (4): 1493–1504, Bibcode:1992AJ....104.1493E, doi:10.1086/116334.
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