# 41 Sextantis

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Spectroscopic binary with an Am star

41 Sextantis Location of 41 Sex on the map (circled) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Sextans Right ascension 10h 50m 18.05639s[1] Declination −08° 53′ 51.9538″[1] Apparent magnitude (V) 5.79±0.01[2] Characteristics Aa Spectral type kA3 hA7V mA9[3] U−B color index +0.13[4] B−V color index +0.16[4] Ab Spectral type F/G[5] Astrometry Radial velocity (Rv) −4.9±2.9[6] km/s Proper motion (μ) RA: −5.694 mas/yr[1] Dec.: −15.814 mas/yr[1] Parallax (π) 10.5160±0.0428 mas[1] Distance 310 ± 1 ly (95.1 ± 0.4 pc) Absolute magnitude (MV) +0.91[7] Orbit[5] Primary Aa Period (P) 6.1670 d Eccentricity (e) 0.014±0.006[8] Periastron epoch (T) 2,453,690.7442±0.0011 JD Argument of periastron (ω) (secondary) 272±4[8]° Semi-amplitude (K1) (primary) 46.67±0.04 km/s Semi-amplitude (K2) (secondary) 93.06±0.20 km/s Details Aa Mass 2.23[9] M☉ Radius 3.10±0.16[10] R☉ Luminosity 32.6±1.7[11] L☉ Surface gravity (log g) 3.83+0.10 −0.07[12] cgs Temperature 7,759[13] K Metallicity [Fe/H] −0.23[14] dex Rotational velocity (v sin i) 24[5] km/s Age 698+128 −108[13] Myr Ab Mass 1.05[9] M☉ Radius 1.3±0.2[5] R☉ Luminosity 1.8±0.5[5] L☉ Rotational velocity (v sin i) 10[5] km/s Other designations 41 Sex, 74 G. Sextantis[15], BD−08°3018, FK5 1281, GC 14906, HD 93903, HIP 52980, HR 4237, SAO 137823, CCDM J10503-0853A, WDS J10503-0854A[16] Database references SIMBAD data

**41 Sextantis** (**HD 93903; HR 4237; 74 G. Sextantis**), or simply **41 Sex** is a [spectroscopic binary](/source/Spectroscopic_binary) located in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) [Sextans](/source/Sextans). It has an [apparent magnitude](/source/Apparent_magnitude) of 5.79,[2] making it faintly visible to the [naked eye](/source/Naked_eye) under ideal conditions. The system is located relatively close at a distance of 310 [light-years](/source/Light-year) based on [Gaia DR3](/source/Gaia_DR3) [parallax](/source/Parallax) measurements[1] and it is drifting closer with a heliocentric [radial velocity](/source/Radial_velocity) of approximately −4.9 [km/s](/source/Metre_per_second).[6] At its current distance, 41 Sex's brightness is diminished by an [interstellar extinction](/source/Interstellar_extinction) of 0.16 [magnitudes](/source/Magnitude_(astronomy))[17] and it has an [absolute magnitude](/source/Absolute_magnitude) of +0.91.[7]

The visible component has a [stellar classification](/source/Stellar_classification) of kA3hA7VmA9,[3] indicating that it is an [Am star](/source/Am_star) with the [calcium K-lines](/source/Calcium_K-line) of an A3 star, the [hydrogen lines](/source/Hydrogen_lines) and [effective temperature](/source/Effective_temperature) of an A7 [main-sequence star](/source/Main-sequence_star), and the [metal lines](/source/Metal_lines) of an A9 star. Houk & Swift (1999) give a class of A2/3 III,[18] indicating that it is an [A-type star](/source/A-type_star) that has the characteristics of an A2 and A3 [giant star](/source/Giant_star). It has 2.23 times the [mass of the Sun](/source/Mass_of_the_Sun)[9] and a slightly enlarged [radius](/source/Radius) 3.10 times that of the [Sun](/source/Sun).[10] It radiates 32.6 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun)[11] from its [photosphere](/source/Photosphere) at an effective temperature of 7,759 [K](/source/Kelvin),[13] giving it a white-hue when viewed in the [night sky](/source/Night_sky). 41 Sextantis Aa is metal-deficient with an [iron](/source/Iron) abundance 58.9% that of the Sun[14] and it spins modestly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 24 [km/s](/source/Metre_per_second).[5]

The companion's spectrum is very weak compared to the primary, but it is said to be either a late [F-type star](/source/F-type_star) or an early [G-type star](/source/G-type_star).[5] It has 105% the mass of the Sun[9] and 1.3 times the [radius of the Sun](/source/Radius_of_the_Sun).[5] It radiates 1.8 times the luminosity of the Sun from its photosphere.[5] It spins slowly with a [projected rotational velocity](/source/Projected_rotational_velocity) of 10 km/s.[5]

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D3762853390993791488%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

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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 [41 Sextantis](https://en.wikipedia.org/wiki/41_Sextantis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/41_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.