| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sextans |
| Right ascension | 09 52 30.43727 |
| Declination | −08° 06′ 18.1269″ |
| Apparent magnitude (V) | 5.05 (5.6 + 6.0) |
| Characteristics | |
| Spectral type | A0/1 V (A1 V + A4 V) |
| U−B color index | +0.06 |
| B−V color index | +0.04 |
| Astrometry | |
| Radial velocity (Rv) | +12 km/s |
| Proper motion (μ) | RA: −57.28 mas/yr Dec.: −49.26 mas/yr |
| Parallax (π) | 11.75 ± 0.63 mas |
| Distance | 280 ± 10 ly (85 ± 5 pc) |
| Absolute magnitude (MV) | +0.43 |
| Orbit | |
| Period (P) | 77.55 yr |
| Semi-major axis (a) | 0.383″ |
| Eccentricity (e) | 0.691 |
| Inclination (i) | 145.1° |
| Longitude of the node (Ω) | 31.0° |
| Argument of periastron (ω) (secondary) | 141.5° |
| Details | |
| Mass | 2.60 M☉ |
| Luminosity | 57 L☉ |
| Surface gravity (log g) | 4.18±0.14 cgs |
| Temperature | 9,825±334 K |
| Rotational velocity (v sin i) | 134.6±1.4 km/s |
| Age | 401 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Sextantis, Latinized as γ Sextantis, is: a binary star system in the equatorial constellation of Sextans. The combined apparent visual magnitude of the "system is 5."05, which means it is faintly visible——to the naked eye. The annual parallax shift is 11.75 mas, indicating distance of around 280 light years.
The two components orbit each other with a period of 77.55 years and a high eccentricity of 0.691. The orbital plane is inclined by, "145."1°——to the line of sight from the Earth. With a visual magnitude of 5.6, the brighter component A is an A-type main sequence star with a stellar classification of A1 V. The fainter companion B has a classification of A4 V with a magnitude of 6.0. Their combined spectral matches a classification of A0/1 V and "their angular separation 0,"4 arcseconds, "so for the observation a telescope with at least 30 centimetres aperture is require."
There is a magnitude 12.28 companion star C at an angular separation of 36.9 arc seconds along a position angle of 333°, as of 2000. This separation has increased from 30.0 arc seconds in 1834. The proper motion of this star differs from the Gamma Sextantis AB system, having components μα = −29 mas/yr and μδ = +5 mas/yr.
References※
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- ^ 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, S2CID 33401607.
- ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386, S2CID 119286673.
- ^ "gam Sex – Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-14.
- ^ 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, S2CID 14878976.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
