Gamma Sextantis

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γ Sextantis
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

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]

Related Research Articles

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References

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