Epsilon Sextantis

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ε Sextantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 17m 37.80200s[1]
Declination −08° 04′ 08.0898″[1]
Apparent magnitude (V) 5.24[2]
Spectral type F0 IV[3]
U−B color index +0.09[2]
B−V color index +0.32[2]
Proper motion (μ) RA: −160.57[1] mas/yr
Dec.: +2.91[1] mas/yr
Parallax (π) 16.86 ± 0.28[1] mas
Distance 193 ± 3 ly
(59.3 ± 1.0 pc)
Absolute magnitude (MV) 2.42[4]
Mass 1.94[5] M
Surface gravity (log g) 3.83±0.08[6] cgs
Temperature 7,166±88[6] K
Metallicity [Fe/H] +0.31±0.05[6] dex
Rotational velocity (v sin i) 63.5±3.2[4] km/s
Age 1.1[5] Gyr
Other designations
ε Sex, 22 Sextantis, BD−07° 3001, FK5 1263, HD 89254, HIP 50414, HR 4042, SAO 137469.[7]
Database references

Epsilon Sextantis (ε Sex, ε Sextantis) is a solitary[8] star in the equatorial constellation Sextans. With an apparent visual magnitude of 5.24,[2] it is faintly visible to the naked eye on a dark night. The distance to this star, based upon an annual parallax shift of 16.86 mas,[1] is about 193 light years.

This is an F-type subgiant star with a stellar classification of F0 IV.[3] However, Malaroda (1975) gave a classification of F2 III,[9] which would indicate a more evolved giant star. It is estimated to have nearly double the mass of the Sun.[5] The star is around 1.1 billion years old and has a projected rotational velocity of 63.5 km/s.[4]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, 5, Bibcode:1999MSS...C05....0H. 
  4. ^ a b c Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399Freely accessible, doi:10.1051/0004-6361:20053911. 
  5. ^ a b c 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, Bibcode:2015ApJ...804..146D, arXiv:1501.03154Freely accessible, doi:10.1088/0004-637X/804/2/146. 
  6. ^ a b c Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, Bibcode:2011A&A...531A.165P, arXiv:1104.4952Freely accessible, doi:10.1051/0004-6361/201116769. 
  7. ^ "eps Sex -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-16. 
  8. ^ Eggleton, P. P.; et al. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x. 
  9. ^ 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.