Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Sextans |
Right ascension | 09h 52m 30.43727s [1] |
Declination | −08° 06′ 18.1269″ [1] |
Apparent magnitude (V) | 5.05 [2] (5.6 + 6.0) [3] |
Characteristics | |
Spectral type | A0/1 V [4] (A1 V + A4 V) [5] |
U−B color index | +0.06 [2] |
B−V color index | +0.04 [2] |
Astrometry | |
Radial velocity (Rv) | +12 [6] km/s |
Proper motion (μ) |
RA: −57.28
[1]
mas/
yr Dec.: −49.26 [1] mas/ yr |
Parallax (π) | 11.75 ± 0.63 mas [1] |
Distance | 280 ± 10
ly (85 ± 5 pc) |
Absolute magnitude (MV) | +0.43 [7] |
Orbit [3] | |
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 [8] M☉ |
Luminosity | 57 [9] L☉ |
Surface gravity (log g) | 4.18±0.14 [8] cgs |
Temperature | 9,825±334 [8] K |
Rotational velocity (v sin i) | 134.6±1.4 [10] km/s |
Age | 401 [8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Sextantis, Latinized as γ Sextantis, is a binary star [12] system in the equatorial constellation of Sextans. The combined apparent visual magnitude of the system is 5.05, [2] which means it is faintly visible to the naked eye. The annual parallax shift is 11.75 mas, [1] indicating a 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. [1] With a visual magnitude of 5.6, [5] the brighter component A is an A-type main sequence star with a stellar classification of A1 V. [5] The fainter companion B has a classification of A4 V [5] with a magnitude of 6.0. [5] Their combined spectral matches a classification of A0/1 V [4] 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. [13]