# LP 71-82

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Red dwarf star in the constellation Draco

LP 71-82 An R band light curve for LP 71-82 showing flares, adapted from Baran et al. (2013)[1] Observation data Epoch J2000.0 Equinox J2000.0 Constellation Draco Right ascension 18h 02m 16.60s Declination 64° 15′ 44.6″ Apparent magnitude (V) 13.51[1] Characteristics Spectral type M5.0V Apparent magnitude (J) 8.54[2] Astrometry Proper motion (μ) RA: 196.394 mas/yr[3] Dec.: -383.789 mas/yr[3] Parallax (π) 128.3057±0.0319 mas[3] Distance 25.420 ± 0.006 ly (7.794 ± 0.002 pc) Details[4] Mass 0.16±0.01 M☉ Radius 0.195±0.002 R☉ Luminosity 0.0033±0.0003 L☉ Habitable zone inner limit 0.06 Habitable zone outer limit 0.12 Surface gravity (log g) 4.5[5] cgs Temperature 3124±51 K Rotation 0.28018±0.000010 d Rotational velocity (v sin i) 11.3±1.5 km/s Age 0.5+1.1 −0.34 Gyr Other designations G 227-22, LP 71-82, LSPM J1802+6415, NLTT 45873, GSC 04209-01465, 2MASS J18021660+6415445, Gaia DR2 2161121135533953536 Database references SIMBAD data

**LP 71-82** is a [red dwarf](/source/Red_dwarf) star, located in constellation [Draco](/source/Draco_(constellation)) at 25.42 [light-years](/source/Light-year) (7.79 [parsecs](/source/Parsec)) from Earth.[3] Kinematically, it is probably belongs to the [Ursa Major Moving Group](/source/Ursa_Major_Moving_Group).[6]

LP 71-82 is a flare star with a very strong activity,[1] with at least four flares detected by 2019.[5] Such activity is expected for a star with a short rotational period of just 6 hours. As a low mass star, it is fully convective. It is visible nearly pole-on, with rotational axis deflected from the Sun by 19±3° degrees.[4] The star has a magnetic fields in chromosphere in 3.8-4.7 [kilogauss](/source/Gauss_(unit)) range.[7]

Multiplicity surveys did not find any stellar companions to LP 71-82 as in 2014.[8]

## References

1. ^ [***a***](#cite_ref-Baran2014_1-0) [***b***](#cite_ref-Baran2014_1-1) [***c***](#cite_ref-Baran2014_1-2) [Mt. Suhora Survey – Searching for Pulsating M Dwarfs. III](http://acta.astrouw.edu.pl/Vol63/n1/pdf/pap_63_1_4.pdf)

1. **[^](#cite_ref-2)** Reiners, A.; et al. (2017), "The CARMENES search for exoplanets around M dwarfs", *Astronomy & Astrophysics*, **612**: A49, [arXiv](/source/ArXiv_(identifier)):[1711.06576](https://arxiv.org/abs/1711.06576), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201732054](https://doi.org/10.1051%2F0004-6361%2F201732054)

1. ^ [***a***](#cite_ref-EDR3_3-0) [***b***](#cite_ref-EDR3_3-1) [***c***](#cite_ref-EDR3_3-2) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. (Gaia collaboration) (2021). ["*Gaia* Early Data Release 3: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202039657). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **649**: A1. [arXiv](/source/ArXiv_(identifier)):[2012.01533](https://arxiv.org/abs/2012.01533). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...649A...1G](https://ui.adsabs.harvard.edu/abs/2021A&A...649A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039657](https://doi.org/10.1051%2F0004-6361%2F202039657). [S2CID](/source/S2CID_(identifier)) [227254300](https://api.semanticscholar.org/CorpusID:227254300). (Erratum: [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039657e](https://doi.org/10.1051%2F0004-6361%2F202039657e)). [Gaia EDR3 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20EDR3%202161121135533953536) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Robertson2020_4-0) [***b***](#cite_ref-Robertson2020_4-1) Robertson, Paul; Stefansson, Gudmundur; [Mahadevan, Suvrath](/source/Suvrath_Mahadevan); Endl, Michael; Cochran, William D.; Beard, Corey; Bender, Chad F.; Diddams, Scott A.; Duong, Nicholas; Ford, Eric B.; Fredrick, Connor; Halverson, Samuel; Hearty, Fred; Holcomb, Rae; Juan, Lydia; Kanodia, Shubham; Lubin, Jack; Metcalf, Andrew J.; Monson, Andrew; Ninan, Joe P.; Palafoutas, Jonathan; Ramsey, Lawrence W.; Roy, Arpita; Schwab, Christian; Terrien, Ryan C.; Wright, Jason T. (2020), "Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone Planet Finder and Keck/HIRES", *The Astrophysical Journal*, **897** (2): 125, [arXiv](/source/ArXiv_(identifier)):[2005.09657](https://arxiv.org/abs/2005.09657), [Bibcode](/source/Bibcode_(identifier)):[2020ApJ...897..125R](https://ui.adsabs.harvard.edu/abs/2020ApJ...897..125R), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ab989f](https://doi.org/10.3847%2F1538-4357%2Fab989f), [S2CID](/source/S2CID_(identifier)) [218718929](https://api.semanticscholar.org/CorpusID:218718929)

1. ^ [***a***](#cite_ref-Martinez2019_5-0) [***b***](#cite_ref-Martinez2019_5-1) Rodríguez Martínez, Romy; Lopez, Laura A.; Shappee, Benjamin J.; Schmidt, Sarah J.; Jayasinghe, Tharindu; Kochanek, Christopher S.; Auchettl, Katie; Holoien, Thomas W.-S. (2019), "A Catalog of M-dwarf Flares with ASAS-SN", *The Astrophysical Journal*, **892** (2): 144, [arXiv](/source/ArXiv_(identifier)):[1912.05549](https://arxiv.org/abs/1912.05549), [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ab793a](https://doi.org/10.3847%2F1538-4357%2Fab793a), [S2CID](/source/S2CID_(identifier)) [209323915](https://api.semanticscholar.org/CorpusID:209323915)

1. **[^](#cite_ref-6)** [Reliable probabilistic determination of membership in stellar kinematic groups in the young disk, Table 4](https://www.aanda.org/articles/aa/full_html/2014/07/aa22575-13/T5.html)

1. **[^](#cite_ref-7)** Shulyak, D.; Reiners, A.; Nagel, E.; Tal-Or, L.; Caballero, J. A.; Zechmeister, M.; Béjar, V. J. S.; Cortés-Contreras, M.; Martin, E. L.; Kaminski, A.; Ribas, I.; Quirrenbach, A.; Amado, P. J.; Anglada-Escudé, G.; Bauer, F. F.; Dreizler, S.; Guenther, E. W.; Henning, T.; Jeffers, S. V.; Kürster, M.; Lafarga, M.; Montes, D.; Morales, J. C.; Pedraz, S. (2019), "Magnetic fields in M dwarfs from the CARMENES survey", *Astronomy & Astrophysics*, **626**: A86, [arXiv](/source/ArXiv_(identifier)):[1904.12762](https://arxiv.org/abs/1904.12762), [Bibcode](/source/Bibcode_(identifier)):[2019A&A...626A..86S](https://ui.adsabs.harvard.edu/abs/2019A&A...626A..86S), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201935315](https://doi.org/10.1051%2F0004-6361%2F201935315), [S2CID](/source/S2CID_(identifier)) [139101130](https://api.semanticscholar.org/CorpusID:139101130)

1. **[^](#cite_ref-8)** Janson, Markus; Bergfors, Carolina; Brandner, Wolfgang; Kudryavtseva, Natalia; Hormuth, Felix; Hippler, Stefan; Henning, Thomas (2014), "The Astralux Multiplicity Survey: Extension to Late M-Dwarfs", *The Astrophysical Journal*, **789** (2): 102, [arXiv](/source/ArXiv_(identifier)):[1406.0535](https://arxiv.org/abs/1406.0535), [Bibcode](/source/Bibcode_(identifier)):[2014ApJ...789..102J](https://ui.adsabs.harvard.edu/abs/2014ApJ...789..102J), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/789/2/102](https://doi.org/10.1088%2F0004-637X%2F789%2F2%2F102), [S2CID](/source/S2CID_(identifier)) [118403775](https://api.semanticscholar.org/CorpusID:118403775)

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [LP 71-82](https://en.wikipedia.org/wiki/LP_71-82) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/LP_71-82?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.