41 Capricorni

41 Capricorni is a binary star[7] system in the southern constellation of Capricornus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.24.[2] The distance to this star, based upon an annual parallax shift of 19.06±0.29 mas,[1] is around 171 light years. It is moving closer with a heliocentric radial velocity of −45 km/s.[4]

41 Capricorni
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension  21h 28m 43.40070s[1]
Declination −21° 48′ 25.8504″[1]
Apparent magnitude (V) +5.24[2]
Characteristics
Spectral type K0 III[3]
B−V color index 0.991±0.002[4]
Astrometry
Radial velocity (Rv)−45.1±1.3[4] km/s
Proper motion (μ) RA: +134.83[1] mas/yr
Dec.: −5.73[1] mas/yr
Parallax (π)19.06 ± 0.29[1] mas
Distance171 ± 3 ly
(52.5 ± 0.8 pc)
Absolute magnitude (MV)0.99[4]
Details
Mass2.55[2] M☉
Luminosity48.25[4] L☉
Surface gravity (log g)3.05[5] cgs
Temperature4,910[5] K
Metallicity [Fe/H]−0.01[5] dex
Age550[2] Myr
Other designations
b Cap, 41 Cap, CD−23° 17057, GC 30365, HD 206356, HIP 107128, HR 8285, SAO 190559, ADS 15223, CCDM J21420-2316[6]
Database references
SIMBADdata

This is a yellow K-type giant star with a stellar classification of K0 III.[3] At the age of around 550[2] million years it has become a red clump star,[8] which indicates it is generating energy via helium fusion at its core. It has an estimated 2.55[2] times the mass of the Sun and is radiating 48[4] times the Sun's luminosity from its photosphere at an effective temperature of 4,910 K.[5] The magnitude 11.5 companion lies at an angular separation of 5.5″, as of 2008.[7]

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. Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.
  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. 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.
  5. Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
  6. "41 Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-15.
  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. Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278.
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