Epsilon 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] |
Characteristics | |
Spectral type | F0 IV[3] |
U−B color index | +0.09[2] |
B−V color index | +0.32[2] |
Astrometry | |
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] |
Details | |
Mass | 1.94[5] M☉ |
Surface gravity (log g) | ±0.08 3.83[6] cgs |
Temperature | ±88 7,166[6] K |
Metallicity [Fe/H] | ±0.05 +0.31[6] dex |
Rotational velocity (v sin i) | ±3.2 63.5[4] km/s |
Age | 1.1[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]
References
- 1 2 3 4 5 6 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.
- 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 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.
- 1 2 3 Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.
- 1 2 3 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.
- 1 2 3 Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
- ↑ "* eps Sex". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-16.
- ↑ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ 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.
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