Gamma Capricorni

γ Capricorni
Location of γ Capricorni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Capricornus
Right ascension 21h 40m 05.45648s[1]
Declination −16° 39′ 44.307184″[1]
Apparent magnitude (V) +3.67[2]
Characteristics
Spectral type kF0hF1VmF2[3]
U−B color index +0.22[4]
B−V color index +0.32[4]
Variable type α2 CVn[5]
Astrometry
Radial velocity (Rv)−31.2±0.5[6] km/s
Proper motion (μ) RA: +187.56[1] mas/yr
Dec.: −22.45[1] mas/yr
Parallax (π)20.77 ± 0.72 mas[1]
Distance157 ± 5 ly
(48 ± 2 pc)
Absolute magnitude (MV)+2.60[7]
Details
Mass2.44[8] M☉
Radius2.35[8] R☉
Surface gravity (log g)3.69[8] cgs
Temperature7,520[9] K
Metallicity [Fe/H]+0.5[9] dex
Rotational velocity (v sin i)40[10] km/s
Other designations
Nashira, Gamma Cap, Gam Cap, γ Cap, 40 Capricorni, BD−17°6340, FK5 812, GJ 4209, HD 206088, HIP 106985, HR 8278, SAO 164560[11]
Database references
SIMBADdata

Gamma Capricorni or γ Capricorni, formally named Nashira (/ˈnæʃɪrə/),[12] is a giant star in the constellation of Capricornus. Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 157 light-years from the Sun. The star is drifting closer with a radial velocity of −31 km/s.[6] It is 2.56 degrees south of the ecliptic, so it can be occulted by the Moon, and (rarely) by planets.

  1. ^ a b c d e 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, S2CID 18759600.
  2. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
  8. ^ a b c Glagolevskij, Yu. V. (January 2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin. 74 (1): 66–79. Bibcode:2019AstBu..74...66G. doi:10.1134/S1990341319010073. S2CID 149900274.
  9. ^ a b Burkhart, C.; Coupry, M. F. (September 1991). "The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe". Astronomy and Astrophysics. 249 (1): 205–216. Bibcode:1991A&A...249..205B.
  10. ^ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
  11. ^ "gam Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-06-20.
  12. ^ "Naming Stars". IAU.org. Retrieved 7 March 2018.