LHS 2924

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 35.78 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,^[3] 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.

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

See also

• 2MASS J0523-1403
• EBLM J0555-57