# HD 85709

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Suspected variable in Sextans

HD 85709 Location of HD 85709 on the map (circled) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Sextans[1] Right ascension 09h 53m 42.92424s[2] Declination +05° 57′ 30.8742″[2] Apparent magnitude (V) 5.95[3] (5.89 - 5.95)[4] Characteristics Evolutionary stage AGB[5] Spectral type M2.5 III[6] U−B color index +1.93[7] B−V color index +1.66[7] Variable type suspected[8] Astrometry Radial velocity (Rv) −0.66±0.40[9] km/s Proper motion (μ) RA: −3.026 mas/yr[2] Dec.: +1.315 mas/yr[2] Parallax (π) 2.9474±0.107 mas[2] Distance 1,110 ± 40 ly (340 ± 10 pc) Absolute magnitude (MV) −1.30[1] Details Radius 133±7[10] R☉ Luminosity 1,918±144[11] L☉ Surface gravity (log g) 0.469[12] cgs Temperature 3,622±125[12] K Metallicity [Fe/H] +0.23[13] dex Other designations 14 G. Sextantis[14], NSV 18292, AG+06°1262, BD+06°2224, GC 13608, HD 85709, HIP 48519, HR 3915, SAO 117975 Database references SIMBAD data

**HD 85709** (**HR 3915; 14 G. Sextantis; NSV 18292**) is a solitary [star](/source/Star)[15] located in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) [Sextans](/source/Sextans). It is faintly visible to the [naked eye](/source/Naked_eye) as a red-hued point of light with an [apparent magnitude](/source/Apparent_magnitude) of 5.95.[3] The object is located relatively far at a distance of 1,100 [light-years](/source/Light-year) based on [Gaia DR3](/source/Gaia_DR3) [parallax](/source/Parallax) measurements but it is slowly drifting closer with a heliocentric [radial velocity](/source/Radial_velocity) of −0.66 [km/s](/source/Metre_per_second).[9] At its current distance, HD 85709's brightness is diminished with an [interstellar extinction](/source/Interstellar_extinction) of two-tenths of a [magnitude](/source/Magnitude_(astronomy))[16] and it has an [absolute magnitude](/source/Absolute_magnitude) of −1.30.[1]

HD 85709 has a [stellar classification](/source/Stellar_classification) of M2.5 III,[6] indicating that it is an [evolved](/source/Stellar_evolution) [M-type](/source/M-type_star) [giant star](/source/Giant_star). It is currently on the [asymptotic giant branch](/source/Asymptotic_giant_branch),[5] the point where it is generating energy via the fusion of [hydrogen](/source/Hydrogen) and [helium](/source/Helium) shells around an inert [carbon](/source/Carbon) [core](/source/Stellar_core). Having expanded to 133 times the [radius of the Sun](/source/Radius_of_the_Sun),[10] it now radiates 1,918 times the [luminosity of the Sun](/source/Luminosity_of_the_Sun)[11] from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 3,622 [K](/source/Kelvin).[12] HD 85709 is metal enriched with an [iron](/source/Iron) abundance 1.58 times that of the [Sun](/source/Sun)'s.[13]

In 1991, [astronomer](/source/Astronomer) V.G. Kornilov and colleagues observed that HD 85709 fluctuated between magnitudes 5.89 and 5.95 in [optical light](/source/Optical_light) during a photometry survey.[4] As of 2004 however, its variability has not been confirmed.[17]

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) [***c***](#cite_ref-Anderson2012_1-2) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=48519&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) 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%3D3850353866361434368%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Ducati2002_3-0) [***b***](#cite_ref-Ducati2002_3-1) Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". *VizieR Online Data Catalog*. **2237**. [Bibcode](/source/Bibcode_(identifier)):[2002yCat.2237....0D](https://ui.adsabs.harvard.edu/abs/2002yCat.2237....0D).

1. ^ [***a***](#cite_ref-Kornilov1991_4-0) [***b***](#cite_ref-Kornilov1991_4-1) Kornilov, V. G.; Volkov, I. M.; Zakharov, A. I.; Kozyreva, V. S.; Kornilova, L. N.; Krutyakov, A. N.; Krylov, A. V.; Kusakin, A. V.; Leont'ev, S. E.; Mironov, A. V.; Moshkalev, V. G.; Pogrosheva, T. M.; Sementsov, V. N.; Khaliullin, Kh. F. (1991). "Catalogue of WBVR-magnitudes of bright stars of the northern sky". *Trudy Gosudarstvennogo Astronomicheskogo Instituta*. **63**: 4–399. [Bibcode](/source/Bibcode_(identifier)):[1991TrSht..63....1K](https://ui.adsabs.harvard.edu/abs/1991TrSht..63....1K). [ISSN](/source/ISSN_(identifier)) [0371-6791](https://search.worldcat.org/issn/0371-6791).

1. ^ [***a***](#cite_ref-Eggen1992_5-0) [***b***](#cite_ref-Eggen1992_5-1) Eggen, Olin J. (July 1992). ["Asymptotic giant branch stars near the sun"](https://doi.org/10.1086%2F116239). *The Astronomical Journal*. **104**: 275. [Bibcode](/source/Bibcode_(identifier)):[1992AJ....104..275E](https://ui.adsabs.harvard.edu/abs/1992AJ....104..275E). [doi](/source/Doi_(identifier)):[10.1086/116239](https://doi.org/10.1086%2F116239). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256). [S2CID](/source/S2CID_(identifier)) [121672252](https://api.semanticscholar.org/CorpusID:121672252).

1. ^ [***a***](#cite_ref-Wilson1950_6-0) [***b***](#cite_ref-Wilson1950_6-1) Wilson, Ralph E.; Joy, Alfred H. (March 1950). ["Radial Velocities of 2111 Stars"](https://doi.org/10.1086%2F145261). *The Astrophysical Journal*. **111**: 221. [Bibcode](/source/Bibcode_(identifier)):[1950ApJ...111..221W](https://ui.adsabs.harvard.edu/abs/1950ApJ...111..221W). [doi](/source/Doi_(identifier)):[10.1086/145261](https://doi.org/10.1086%2F145261). [eISSN](/source/EISSN_(identifier)) [1538-4357](https://search.worldcat.org/issn/1538-4357). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X). [S2CID](/source/S2CID_(identifier)) [122883647](https://api.semanticscholar.org/CorpusID:122883647).

1. ^ [***a***](#cite_ref-Johnson1966_7-0) [***b***](#cite_ref-Johnson1966_7-1) Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". *Communications of the Lunar and Planetary Laboratory*. **4**: 99–110. [Bibcode](/source/Bibcode_(identifier)):[1966CoLPL...4...99J](https://ui.adsabs.harvard.edu/abs/1966CoLPL...4...99J).

1. **[^](#cite_ref-Samus2017_8-0)** Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". *Astronomy Reports*. **61** (1): 80–88. [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S). [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085). [eISSN](/source/EISSN_(identifier)) [1562-6881](https://search.worldcat.org/issn/1562-6881). [ISSN](/source/ISSN_(identifier)) [1063-7729](https://search.worldcat.org/issn/1063-7729). [S2CID](/source/S2CID_(identifier)) [125853869](https://api.semanticscholar.org/CorpusID:125853869).

1. ^ [***a***](#cite_ref-Famaey2005_9-0) [***b***](#cite_ref-Famaey2005_9-1) Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). ["Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters"](https://doi.org/10.1051%2F0004-6361%3A20041272). *Astronomy and Astrophysics*. **430**: 165. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0409579](https://arxiv.org/abs/astro-ph/0409579). [Bibcode](/source/Bibcode_(identifier)):[2005A&A...430..165F](https://ui.adsabs.harvard.edu/abs/2005A&A...430..165F). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20041272](https://doi.org/10.1051%2F0004-6361%3A20041272). [S2CID](/source/S2CID_(identifier)) [17804304](https://api.semanticscholar.org/CorpusID:17804304).

1. ^ [***a***](#cite_ref-Kervella2004_10-0) [***b***](#cite_ref-Kervella2004_10-1) Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). ["The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry"](https://doi.org/10.1051%2F0004-6361%3A20035930). *Astronomy & Astrophysics*. **426** (1): 297–307. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0404180](https://arxiv.org/abs/astro-ph/0404180). [Bibcode](/source/Bibcode_(identifier)):[2004A&A...426..297K](https://ui.adsabs.harvard.edu/abs/2004A&A...426..297K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20035930](https://doi.org/10.1051%2F0004-6361%3A20035930). [eISSN](/source/EISSN_(identifier)) [1432-0746](https://search.worldcat.org/issn/1432-0746). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [S2CID](/source/S2CID_(identifier)) [6077801](https://api.semanticscholar.org/CorpusID:6077801).

1. ^ [***a***](#cite_ref-GaiaDR2_11-0) [***b***](#cite_ref-GaiaDR2_11-1) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%203850353866361434368) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-McDonald2017_12-0) [***b***](#cite_ref-McDonald2017_12-1) [***c***](#cite_ref-McDonald2017_12-2) McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). ["Fundamental parameters and infrared excesses of Tycho–Gaia stars"](https://doi.org/10.1093%2Fmnras%2Fstx1433). *Monthly Notices of the Royal Astronomical Society*. **471** (1): 770–791. [arXiv](/source/ArXiv_(identifier)):[1706.02208](https://arxiv.org/abs/1706.02208). [Bibcode](/source/Bibcode_(identifier)):[2017MNRAS.471..770M](https://ui.adsabs.harvard.edu/abs/2017MNRAS.471..770M). [doi](/source/Doi_(identifier)):[10.1093/mnras/stx1433](https://doi.org/10.1093%2Fmnras%2Fstx1433). [eISSN](/source/EISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [S2CID](/source/S2CID_(identifier)) [73594365](https://api.semanticscholar.org/CorpusID:73594365).

1. ^ [***a***](#cite_ref-Zhou1991_13-0) [***b***](#cite_ref-Zhou1991_13-1) Zhou, Xu (August 1991). "The near-IR NA I doublet and CA II triplet in late-type stars and the determination of stellar atmosphere parameters". *Astronomy and Astrophysics*. **248**: 367. [Bibcode](/source/Bibcode_(identifier)):[1991A&A...248..367Z](https://ui.adsabs.harvard.edu/abs/1991A&A...248..367Z). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-Gould1879_14-0)** Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". *Resultados del Observatorio Nacional Argentino*. **1**. [Bibcode](/source/Bibcode_(identifier)):[1879RNAO....1.....G](https://ui.adsabs.harvard.edu/abs/1879RNAO....1.....G).

1. **[^](#cite_ref-Eggleton2008_15-0)** Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). ["A catalogue of multiplicity among bright stellar systems"](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x). *Monthly Notices of the Royal Astronomical Society*. **389** (2): 869–879. [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878). [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x). [eISSN](/source/EISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-Gontcharov2017_16-0)** Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). ["Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars"](https://doi.org/10.1093%2Fmnras%2Fstx2219). *Monthly Notices of the Royal Astronomical Society*. **472** (4): 3805–3820. [arXiv](/source/ArXiv_(identifier)):[1709.01160](https://arxiv.org/abs/1709.01160). [Bibcode](/source/Bibcode_(identifier)):[2017MNRAS.472.3805G](https://ui.adsabs.harvard.edu/abs/2017MNRAS.472.3805G). [doi](/source/Doi_(identifier)):[10.1093/mnras/stx2219](https://doi.org/10.1093%2Fmnras%2Fstx2219). [eISSN](/source/EISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [S2CID](/source/S2CID_(identifier)) [118879856](https://api.semanticscholar.org/CorpusID:118879856).

1. **[^](#cite_ref-Samus2004_17-0)** Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". *VizieR Online Data Catalog*: II/250. [Bibcode](/source/Bibcode_(identifier)):[2004yCat.2250....0S](https://ui.adsabs.harvard.edu/abs/2004yCat.2250....0S).

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 [HD 85709](https://en.wikipedia.org/wiki/HD_85709) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_85709?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.