# LHS 2065

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Red dwarf star in the constellation Hydra

LHS 2065 Light curves showing four flares on LHS 2065, plotted from TESS data[1] Observation data Epoch J2000 Equinox J2000 Constellation Hydra[2] Right ascension 08h 53m 36.16047s[3] Declination −03° 29′ 32.1975″[3] Apparent magnitude (V) +18.959[4] Characteristics Evolutionary stage main sequence[5] Spectral type M9V[5] Variable type Flare star[6] Astrometry Radial velocity (Rv) 7±2[7] km/s Proper motion (μ) RA: −516.605 mas/yr[3] Dec.: −199.652 mas/yr[3] Parallax (π) 115.4876±0.0726 mas[3] Distance 28.24 ± 0.02 ly (8.659 ± 0.005 pc) Details Mass 0.082±0.002[8] M☉ Radius 0.113±0.006[8] R☉ Luminosity 3.39+0.16 −0.15×10−4[9] L☉ Surface gravity (log g) ~5.5[9] cgs Temperature 2,317+61 −56[8] K Age >0.5[6] Gyr Other designations GJ 3517, LHS 2065, LP 666-9, TIC 7975441, 2MASS J08533619-0329321[10] Database references SIMBAD data

**LHS 2065** is a [red dwarf](/source/Red_dwarf) star, [one of the smallest stars](/source/List_of_smallest_stars) ever found with around 8.2% the [mass of the Sun](/source/Mass_of_the_Sun) and a diameter only 10% greater than Jupiter.[8] It is one of the few [ultracool dwarfs](/source/Ultra-cool_dwarf) known to have [flare](/source/Stellar_flare) activity, emitting one flare every 33 hours,[6] and is also an active X-ray emitter.[5]

Parallax measurements by the Gaia spacecraft give a distance of 8.66 [parsecs](/source/Parsec) (28.2 [ly](/source/Light-year)) to LHS 2065.[3] This star was first recorded by the [Luyten Half-Second catalogue](/source/Luyten_Half-Second_catalogue), a catalogue of stars with proper motions exceeding 0.5". The star's main identifier is named after this catalogue.[11] It is located in the [Hydra](/source/Hydra_(constellation)) constellation.[2]

This star has a [spectral type](/source/Spectral_type) of M9V,[5] indicating a very cool star on the [main sequence](/source/Main_sequence). It is among the nearest ultracool dwarfs to Earth.[6] LHS 2065 has an effective temperature of around 2,317 K,[8] 2.5 times less than the Sun. The lack of lithium in the [star's atmosphere](/source/Stellar_atmosphere) indicate that it must be over 500 million years old.[6]

## See also

- [LHS 2924](/source/LHS_2924)

- [vB 10](/source/VB_10)

- [Brown dwarf](/source/Brown_dwarf)

## References

1. **[^](#cite_ref-MAST_1-0)** ["MAST: Barbara A. Mikulski Archive for Space Telescopes"](https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html). Space Telescope Science Institute. Retrieved 23 September 2024.

1. ^ [***a***](#cite_ref-constellation_2-0) [***b***](#cite_ref-constellation_2-1) [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=LHS+2065&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-DR3_3-0) [***b***](#cite_ref-DR3_3-1) [***c***](#cite_ref-DR3_3-2) [***d***](#cite_ref-DR3_3-3) [***e***](#cite_ref-DR3_3-4) 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%3D5761985432616501376%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-costa2005_4-0)** Costa, Edgardo; Méndez, René A.; Jao, W. -C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer (2005). "The Solar Neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation-First Results from the 1.5 m Telescope Program". *The Astronomical Journal*. **130** (1): 337. [Bibcode](/source/Bibcode_(identifier)):[2005AJ....130..337C](https://ui.adsabs.harvard.edu/abs/2005AJ....130..337C). [doi](/source/Doi_(identifier)):[10.1086/430473](https://doi.org/10.1086%2F430473). [hdl](/source/Hdl_(identifier)):[10533/176842](https://hdl.handle.net/10533%2F176842).

1. ^ [***a***](#cite_ref-robrade_5-0) [***b***](#cite_ref-robrade_5-1) [***c***](#cite_ref-robrade_5-2) [***d***](#cite_ref-robrade_5-3) Robrade, J.; Schmitt, J. H. M. M. (2008-09-01). ["Quiescent X-ray emission from the M9 dwarf LHS 2065"](https://www.aanda.org/articles/aa/abs/2008/33/aa10142-08/aa10142-08.html). *Astronomy & Astrophysics*. **487** (3): 1139–1141. [arXiv](/source/ArXiv_(identifier)):[0806.3863](https://arxiv.org/abs/0806.3863). [Bibcode](/source/Bibcode_(identifier)):[2008A&A...487.1139R](https://ui.adsabs.harvard.edu/abs/2008A&A...487.1139R). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:200810142](https://doi.org/10.1051%2F0004-6361%3A200810142). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. ^ [***a***](#cite_ref-martin2001_6-0) [***b***](#cite_ref-martin2001_6-1) [***c***](#cite_ref-martin2001_6-2) [***d***](#cite_ref-martin2001_6-3) [***e***](#cite_ref-martin2001_6-4) Martín, Eduardo L.; Ardila, David R. (2001-05-01). ["Flares at the Cool End of the M Dwarfs: The Case of LHS 2065"](https://ui.adsabs.harvard.edu/abs/2001AJ....121.2758M/abstract). *The Astronomical Journal*. **121** (5): 2758–2760. [Bibcode](/source/Bibcode_(identifier)):[2001AJ....121.2758M](https://ui.adsabs.harvard.edu/abs/2001AJ....121.2758M). [doi](/source/Doi_(identifier)):[10.1086/320412](https://doi.org/10.1086%2F320412). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-burgasser2015_7-0)** Burgasser, Adam J.; Logsdon, Sarah E.; Gagné, Jonathan; Bochanski, John J.; Faherty, Jaqueline K.; West, Andrew A.; Mamajek, Eric E.; Schmidt, Sarah J.; Cruz, Kelle L. (2015). "The Brown Dwarf Kinematics Project (BDKP). IV. Radial Velocities of 85 Late-M and L Dwarfs with MagE". *The Astrophysical Journal Supplement Series*. **220** (1): 18. [arXiv](/source/ArXiv_(identifier)):[1507.00057](https://arxiv.org/abs/1507.00057). [Bibcode](/source/Bibcode_(identifier)):[2015ApJS..220...18B](https://ui.adsabs.harvard.edu/abs/2015ApJS..220...18B). [doi](/source/Doi_(identifier)):[10.1088/0067-0049/220/1/18](https://doi.org/10.1088%2F0067-0049%2F220%2F1%2F18).

1. ^ [***a***](#cite_ref-Pineda2021_8-0) [***b***](#cite_ref-Pineda2021_8-1) [***c***](#cite_ref-Pineda2021_8-2) [***d***](#cite_ref-Pineda2021_8-3) [***e***](#cite_ref-Pineda2021_8-4) Pineda, J. Sebastian; et al. (September 2021). ["The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars"](https://doi.org/10.3847%2F1538-4357%2Fac0aea). *The Astrophysical Journal*. **918** (1): 23. [arXiv](/source/ArXiv_(identifier)):[2106.07656](https://arxiv.org/abs/2106.07656). [Bibcode](/source/Bibcode_(identifier)):[2021ApJ...918...40P](https://ui.adsabs.harvard.edu/abs/2021ApJ...918...40P). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ac0aea](https://doi.org/10.3847%2F1538-4357%2Fac0aea). [S2CID](/source/S2CID_(identifier)) [235435757](https://api.semanticscholar.org/CorpusID:235435757). 40.

1. ^ [***a***](#cite_ref-sanghi_9-0) [***b***](#cite_ref-sanghi_9-1) Sanghi, Aniket; Liu, Michael C.; Best, William M. J.; Dupuy, Trent J.; Siverd, Robert J.; Zhang, Zhoujian; Hurt, Spencer A.; Magnier, Eugene A.; Aller, Kimberly M.; Deacon, Niall R. (2023-12-06). ["The Hawaii Infrared Parallax Program. VI. The Fundamental Properties of 1000+ Ultracool Dwarfs and Planetary-mass Objects Using Optical to Mid-infrared Spectral Energy Distributions and Comparison to BT-Settl and ATMO 2020 Model Atmospheres"](https://doi.org/10.3847%2F1538-4357%2Facff66). *The Astrophysical Journal*. **959** (1): 63. [Bibcode](/source/Bibcode_(identifier)):[2023AAS...24120311S](https://ui.adsabs.harvard.edu/abs/2023AAS...24120311S). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/acff66](https://doi.org/10.3847%2F1538-4357%2Facff66). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X). Note: See [Zenodo tables](https://zenodo.org/records/10086810)

1. **[^](#cite_ref-SIMBAD_10-0)** ["LHS 2065"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+2065). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2024-09-09.

1. **[^](#cite_ref-LHS_11-0)** Luyten, Willem J. (1979-01-01). [*LHS catalogue. A catalogue of stars with proper motions exceeding 0"5 annually*](https://ui.adsabs.harvard.edu/abs/1979lccs.book.....L/abstract). [Bibcode](/source/Bibcode_(identifier)):[1979lccs.book.....L](https://ui.adsabs.harvard.edu/abs/1979lccs.book.....L).

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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Adapted from the Wikipedia article [LHS 2065](https://en.wikipedia.org/wiki/LHS_2065) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/LHS_2065?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.