# 35 Sextantis

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Triple star system in Sextans

35 Sextantis Location of 35 Sex on the map (circled) Observation data Epoch J2000.0 Equinox ICRS Constellation Sextans A Right ascension 10h 43m 20.92086s[1] Declination +04° 44′ 51.6121″[1] Apparent magnitude (V) 6.09±0.01[2] B Right ascension 10h 43m 20.52732s[3] Declination +04° 44′ 48.2184″[3] Apparent magnitude (V) 7.01±0.01[2] Characteristics U−B color index +1.09[4] B−V color index +1.17[4] A Spectral type K2.5 III[5] B Spectral type K1 II-III[6] Astrometry A Radial velocity (Rv) −3.15±0.16[7] km/s Proper motion (μ) RA: +22.430 mas/yr[1] Dec.: −33.285 mas/yr[1] Parallax (π) 4.6773±0.1457 mas[1] Distance 700 ± 20 ly (214 ± 7 pc) B Radial velocity (Rv) −1.49±0.98[7] km/s Proper motion (μ) RA: +24.384 mas/yr[3] Dec.: −37.384 mas/yr[3] Parallax (π) 4.5442±0.15 mas[3] Distance 720 ± 20 ly (220 ± 7 pc) Orbit[8] Primary A Name B Period (P) 23,302 yr Semi-major axis (a) 6.80" (1,460 AU) Orbit[9] Primary Ba Name Bb Period (P) 1,568.7±2.2 d Semi-major axis (a) 0.021" (4.64 AU) Eccentricity (e) 0.388±0.057 Periastron epoch (T) 2,451,911±27 JD Argument of periastron (ω) (secondary) 311.8±3.3° Semi-amplitude (K1) (primary) 5.55±0.15 km/s Details A Mass 2.45[8] M☉ Radius 25.39+0.8 −2.2[10] R☉ Luminosity 240±7[10] L☉ Temperature 4,512±122[11] K Metallicity [Fe/H] −0.17[12] dex Rotational velocity (v sin i) 3.7±0.3[7] km/s Ba Mass 2.44[8] M☉ Radius 10.15+0.34 −0.30[13] R☉ Luminosity 57.2±1.2[13] L☉ Temperature 5,030±122[11] K Metallicity [Fe/H] −0.16[12] dex Rotational velocity (v sin i) 4.1±0.5[7] km/s Bb Mass 0.58[8] M☉ Other designations 10 H. Sextantis,[14] 35 Sex, 68 G. Sextantis[15], AG+05°1556, BD+05°2384, GC 14745, HD 92841, HIP 52452, HR 4193, SAO 118449, CCDM J10433+0443, TIC 374350811[16] Database references SIMBAD The system A B

**35 Sextantis** (**68 G. Sextantis; HD 92841; HR 4193**), or simply **35 Sex**, is a [triple star system](/source/Triple_star_system) located in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) [Sextans](/source/Sextans). The primary has an [apparent magnitude](/source/Apparent_magnitude) of 6.09,[2] making it barely visible to the [naked eye](/source/Naked_eye), even under ideal conditions. The companion has an [apparent magnitude](/source/Apparent_magnitude) of 7.01,[2] making it readily visible in [binoculars](/source/Binoculars), but not to the naked eye. The system is located relatively far at a distance of approximately 700 [light-years](/source/Light-year) but it is drifting closer with a combined heliocentric [radial velocity](/source/Radial_velocity) of −2.18 [km/s](/source/Metre_per_second).[17]

## The System

A Separation = 6.8″ Period = 23,000 y Ba Separation = 0.021″ Period = 1,580 d Bb

Hierarchy of orbits in the 35 Sextantis system[9]

The system was first observed by [Friedrich Georg Wilhelm von Struve](/source/Friedrich_Georg_Wilhelm_von_Struve) in 1821.[18] The separation between the A and B component was initially 7.90 [arcseconds](/source/Arcseconds),[18] but it has since decreased to 6.62".[19] Thanks to this separation, the components 35 Sextantis can be distinguished using a [telescope](/source/Telescope). Observations from Tokovinin & Gorynya (2007) revealed that the B component is a single-lined [spectroscopic binary](/source/Spectroscopic_binary).[9] The primary and secondary both take 23,302 [years](/source/Years) to [orbit](/source/Orbit) each other while the secondary and its close companion take 1,568 [days](/source/Days) to revolve around each other in a relatively [eccentric](/source/Orbital_eccentricity) orbit.[9]

## Physical characteristic

35 Sextantis A has a [stellar classification](/source/Stellar_classification) of K2.5 III,[5] indicating that it is an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star) that has exhausted [hydrogen](/source/Hydrogen) at its [core](/source/Stellar_core) and left the [main sequence](/source/Main_sequence). 35 Sextantis B has a classification of K1 II-III,[6] indicating that it is a hotter, more evolved K-type star that has the [luminosity class](/source/Luminosity_class) intermediate between a [bright giant](/source/Bright_giant) and giant star. The primary has 2.45 times the [mass of the Sun](/source/Mass_of_the_Sun)[8] but it has expanded to 25.39 times the [radius of the Sun](/source/Radius_of_the_Sun).[10] It radiates 240 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun)[10] from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,512 [K](/source/Kelvin),[11] giving it an orange-hued when viewed in the [night sky](/source/Night_sky).

The secondary has a similar mass to the primary[8] but it is smaller, having a radius 10.15 times that of the [Sun](/source/Sun).[13] 35 Sextantis B radiates 57.2 times the luminosity of the Sun[13] from its photosphere at an effective temperature of 5030 K.[11] Both stars are metal deficient with [iron](/source/Iron) abundances of [Fe/H] = −0.17 and [Fe/H] = −0.16 respectively.[12] They spin modestly with [projected rotational velocities](/source/Projected_rotational_velocity) of 3.7 [km/s](/source/Metre_per_second) and 4.1 km/s.[7] The close companion has a mass 58% that of the Sun's,[8] suggesting that it may be a [K-type main-sequence star](/source/K-type_main-sequence_star).

## References

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v t e Constellation of Sextans COSMOS field List of stars in Sextans Sextans in Chinese astronomy Stars Bayer α β γ δ ε Flamsteed 7 18 19 23 24 25 35 41 Variable Y UY HR 3879 3915 4092 4233 HD 86081 (Bibhā) 92788 93396 Other BD−08°2823 Gliese 393 K2-239 LHS 292 PSR J0952−0607 TOI-561 WASP-43 (Gnomon) WASP-127 Exoplanets BD−08°2823 b c HD 86081 b (Santamasa) HD 92788 b KELT-11b TOI-561 b WASP-43b (Astrolábos) Galaxies NGC 2967 2974 2980 3007 3015 3018 3044 3110 3115 3156 3166 3169 3326 3341 3423 Other 3MM-1 AzTECC71 Baby Boom Galaxy CAPERS-LRD-z9 CID-42 CID-346 Cosmos Redshift 7 HD1 Infinity Galaxy J1000+0221 J1010+0612 J10405643–0103584 LAE J095950.99+021219.1 LBQS 1009−0252 MoM-z14 PG 1011−040 PG 1012+008 PGC 29820 PGC 3092152 PMN J0948+0022 REBELS-25 Sextans A Sextans B Sextans Dwarf Spheroidal Zhúlóng Galaxy clusters Abell 907 CL J1001+0220 Hyperion proto-supercluster Astronomical events AT 2018hyz SN 1000+0216 Category

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Adapted from the Wikipedia article [35 Sextantis](https://en.wikipedia.org/wiki/35_Sextantis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/35_Sextantis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.