Gamma Sextantis
Star in the constellation Sextans From Wikipedia, the free encyclopedia
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.
| 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 | |
| γ Sex, 8 Sextantis, BD−07° 2909, HD 85558, HIP 48437, HR 3909, SAO 137199.[11] | |
| Database references | |
| SIMBAD | data |
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]
References
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