LHS 2924, also commonly known as LP 271-25, is an extremely small and dim ultra-cool red dwarf located in the constellation of Boötes, about 35.85 light years from the Sun. It is very challenging to see LHS 2924 from Earth, because it is so extremely faint, having an apparent magnitude in the 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,[2] being smaller and less luminous than 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 spectral class.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 28m 43.2273s[1] |
| Declination | 33° 10′ 39.2458″[1] |
| Apparent magnitude (V) | 19.35[2] |
| Characteristics | |
| Spectral type | M9Ve[1] |
| Apparent magnitude (B) | 21.2[1] |
| Apparent magnitude (R) | 17.8[1] |
| Apparent magnitude (J) | 11.99[1] |
| Apparent magnitude (H) | 11.225[1] |
| Apparent magnitude (K) | 10.744[1] |
| Astrometry | |
| Radial velocity (Rv) | -39.14 [1] km/s |
| Proper motion (μ) | RA: -346.76[1] mas/yr Dec.: -710.107[1] mas/yr |
| Parallax (π) | 90.9962[1] ± 0.1271[1] mas |
| Distance | 35.845 ly (10.99[1] pc) |
| Absolute magnitude (MV) | 19.15 |
| Details[3] | |
| Mass | 0.08 M☉ |
| Radius | 0.107 R☉ |
| Luminosity (bolometric) | ~0.00021 L☉ |
| Luminosity (visual, LV) | 0.0000016 L☉ |
| Temperature | 2130 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
See also
editReferences
edit- ^ a b c d e f g h i j k l m n "LP 271-25". simbad.u-strasbg.fr.
- ^ a b Probst, R. G.; Liebert, J. (1983-11-01). "LHS 2924 : A uniquely cool low-luminosity star with a peculiar energy distribution". The Astrophysical Journal. 274: 245–251. Bibcode:1983ApJ...274..245P. doi:10.1086/161442. ISSN 0004-637X.
- ^ 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†". Publications of the Astronomical Society of Japan. 68 (1): 13. arXiv:1511.04682. Bibcode:2016PASJ...68...13T. doi:10.1093/pasj/psv119. ISSN 0004-6264.