# LHS 2924

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Red dwarf star in the constellation Boötes

LHS 2924 Observation data Epoch J2000 Equinox J2000 Constellation Boötes[1] Right ascension 14h 28m 43.2275s[2] Declination +33° 10′ 39.259″[2] Apparent magnitude (V) 19.35[3] Characteristics Spectral type M9Ve[4] Apparent magnitude (B) 21.2[4] Apparent magnitude (R) 17.8[4] Apparent magnitude (J) 11.99[4] Apparent magnitude (H) 11.225[4] Apparent magnitude (K) 10.744[4] Astrometry Radial velocity (Rv) −39.14[4] km/s Proper motion (μ) RA: −346.961 mas/yr[2] Dec.: −710.986 mas/yr[2] Parallax (π) 91.1634±0.0994 mas[2] Distance 35.78 ± 0.04 ly (10.97 ± 0.01 pc) Absolute magnitude (MV) 19.15 Details[5] Mass 0.08 M☉ Radius 0.107 R☉ Luminosity (bolometric) ~0.00021 L☉ Luminosity (visual, LV) 0.0000016 L☉ Temperature 2130 K Other designations GJ 3849, LHS 2924, LP 271-25, LSPM J1428+3310, NLTT 37480, TIC 286963145, 2MASS J14284323+3310391, WISEA J142842.93+331031.7, SDSS J142843.13+331036.8, FS 134[4] Database references SIMBAD data

Section of the night sky showing LHS 2924 as a tiny red dot in the middle of the yellow square

**LHS 2924**, also commonly known as **LP 271-25**, is an extremely small and dim [ultra-cool](/source/Ultra-cool_dwarf) [red dwarf](/source/Red_dwarf) located in the [constellation](/source/Constellation) of [Boötes](/source/Bo%C3%B6tes), about 35.78 [light-years](/source/Light-year) (10.97 [parsecs](/source/Parsec)) from the Sun. It is very challenging to see LHS 2924 from Earth, because it is extremely faint, having an apparent magnitude in the [visible spectrum](/source/Visible_spectrum) of only +19.35. Due to its faintness, it was only discovered in 1983, and it was the least massive star known at the time of its discovery,[3] being smaller and less luminous than [VB 10](/source/VB_10), which was before LHS 2924’s discovery the least massive and luminous star known. LHS 2924 is the primary standard for the [M9V](/source/Red_dwarf) spectral class.

## See also

- [2MASS J0523-1403](/source/2MASS_J0523-1403)

- [EBLM J0555-57](/source/EBLM_J0555-57)

## References

1. **[^](#cite_ref-constellation_1-0)** [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+2924&-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-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%3D1287312100751643776%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-probst_3-0) [***b***](#cite_ref-probst_3-1) Probst, R. G.; Liebert, J. (1983-11-01). ["LHS 2924 : A uniquely cool low-luminosity star with a peculiar energy distribution"](https://ui.adsabs.harvard.edu/abs/1983ApJ...274..245P). *The Astrophysical Journal*. **274**: 245–251. [Bibcode](/source/Bibcode_(identifier)):[1983ApJ...274..245P](https://ui.adsabs.harvard.edu/abs/1983ApJ...274..245P). [doi](/source/Doi_(identifier)):[10.1086/161442](https://doi.org/10.1086%2F161442). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. ^ [***a***](#cite_ref-SIMBAD_4-0) [***b***](#cite_ref-SIMBAD_4-1) [***c***](#cite_ref-SIMBAD_4-2) [***d***](#cite_ref-SIMBAD_4-3) [***e***](#cite_ref-SIMBAD_4-4) [***f***](#cite_ref-SIMBAD_4-5) [***g***](#cite_ref-SIMBAD_4-6) [***h***](#cite_ref-SIMBAD_4-7) ["LP 271-25"](http://simbad.u-strasbg.fr/simbad/sim-id). *simbad.u-strasbg.fr*.

1. **[^](#cite_ref-tsuji_5-0)** Tsuji, Takashi; Nakajima, Tadashi (2016-02-01). ["Near-infrared spectroscopy of M dwarfs. III. Carbon and oxygen abundances in late M dwarfs, including the dusty rapid rotator 2MASSI J1835379+325954†"](https://doi.org/10.1093%2Fpasj%2Fpsv119). *Publications of the Astronomical Society of Japan*. **68** (1): 13. [arXiv](/source/ArXiv_(identifier)):[1511.04682](https://arxiv.org/abs/1511.04682). [Bibcode](/source/Bibcode_(identifier)):[2016PASJ...68...13T](https://ui.adsabs.harvard.edu/abs/2016PASJ...68...13T). [doi](/source/Doi_(identifier)):[10.1093/pasj/psv119](https://doi.org/10.1093%2Fpasj%2Fpsv119). [ISSN](/source/ISSN_(identifier)) [0004-6264](https://search.worldcat.org/issn/0004-6264).

v t e Constellation of Boötes Boötes in Chinese astronomy Boötes Void List of stars in Boötes Stars Bayer α (Arcturus) β (Nekkar) γ (Seginus) δ (Qigong) ε (Izar, Pulcherrima) ζ η (Muphrid) θ ι κ λ (Xuange) μ1 (Alkalurops) μ2 ν1 ν2 ξ ο π ρ (Kalasungsang) σ (Genghe) τ (Tepiamenit) υ φ χ ψ ω Flamsteed 1 2 3 6 (e) 7 9 10 11 12 (d) 13 14 15 18 20 22 (f) 24 (g) 26 31 32 33 34 (Alrumh) 38 (Merga) 39 40 44 (Quadrans) 45 (c) 46 (b) 47 (k) 50 Variable R S T RX ZZ AB BL BP BX BY CE CH CI CN CP CR CX CY (101 Vir) DE EK HN HP HD 118508 118889 122563 125040 125351 (A) 125658 126128 126129 126141 126200 126271 127304 127334 127726 128093 128198 129132 129357 130084 130603 130917 131040 131473 131496 (Arcalís) 132029 132406 132563 134064 134335 135438 135530 135944 141399 Other 2MASS J15031961+2525196 CFBDSIR 1458+10 Gliese 526 HAT-P-4 LHS 2924 PSR J1544+4937 SDSS J1416+1348 SDSS J1433+1011 TVLM 513-46546 WASP-14 WD 1425+540 ZTF J153932.16+502738.8 Exoplanets HAT-P-4b HD 128311 b c HD 132406 b HD 136418 b (Awasis) τ Boötis b TOI-1853 b WASP-14b Star clusters NGC 5466 Galaxies NGC 5008 5248 5251 5416 5490 5500 5504 5508 5514 5523 5529 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5562 5579 5582 5591 5601 5603 5609 5613 5614 5615 5624 5629 5630 5641 5642 5653 5665 5676 5681 5682 5683 5698 5714 5722 5752 5753 5754 5755 5772 5778 5784 5790 5820 5821 5829 5837 5857 5875 5876 5886 5888 5896 5929 5930 5966 Numbered I II III Other 3C 295 3C 299 3C 300 3C 303 3C 315 4C 19.44 4C +26.42 7C 1354+2552 Abell 2009 BCG Arp 302 B2 1420+32 B2 1441+26 CEERS-2112 CEERS-93316 CEERS2-588 CLASS B1359+154 Cloverleaf quasar DDO 190 EGS-zs8-1 EGS-z11-R0 EGSY8p7 H1426+428 IC 4397 IC 4461 IC 4462 IC 4481 IC 4516 IRAS 13349+2438 IRAS 14394+5332 IRAS 15206+3342 LEDA 2108986 MACS 1423-z7p64 MACS J1447.4+0827 BCG Maisie's Galaxy Markarian 463 Markarian 471 Markarian 478 MS 1455.0+2232 BCG MS 1512-cB58 NVSS J141343+433945 OQ 172 OQ 530 PG 1411+442 PG 1543+489 PGC 93125 PGC 1470080 PKS 1345+125 PKS 1413+135 QSO B1422+202 RBS 1467 RGZ J145001.5+144747 RGZ J145039.8+441829 SBS 1415+437 SDSS J135646.10+102609.0 SDSS J1430+2303 Teacup galaxy UGC 8669 UGC 9128 UGC 9425 UGC 9684 UGC 9796 ULAS J1342+0928 VV 191 Galaxy clusters Abell 1795 Abell 1991 BoRG-58 IDCS J1426.5+3508 Astronomical events GRB 990123 GRB 080319B SCP 06F6 SN 2003fg SN 2005bc SN 2020tlf Category

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Adapted from the Wikipedia article [LHS 2924](https://en.wikipedia.org/wiki/LHS_2924) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/LHS_2924?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.