Gamma Sextantis

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Template:Short description

γ Sextantis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.05[2] (5.6 + 6.0)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A0/1 V[5] (A1 V + A4 V)[6]
U−B Template:Engvar +0.06[2]
B−V Template:Engvar +0.04[2]
Astrometry
Radial velocity (Rv)+12[7] 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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.43[8]
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
Mass2.60[9] Template:Solar mass
Radius3.2[10] Template:Solar radius
Luminosity69[4] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[9] K
Rotational velocity (v sin i)Script error: No such module "val".[11] km/s
Age401[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
γ Sex, 8 Sextantis, BD−07°2909, HD 85558, HIP 48437, HR 3909, SAO 137199.[12]
Database references
SIMBADdata

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Gamma Sextantis, Latinized as γ Sextantis, is a binary star[13] 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,[6] the brighter component A is an A-type main sequence star with a stellar classification of A1 V.[6] The fainter companion B has a classification of A4 V[6] with a magnitude of 6.0.[6] Their combined spectral matches a classification of A0/1 V[5] 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.[14]

References

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Template:Stars of Sextans

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