LP 944-20 is a dim brown dwarf of spectral class M9 located about 21 light-years from the Solar System in the constellation of Fornax. With a visual apparent magnitude of 18.69, it has one of the dimmest visual magnitudes listed on the RECONS page.
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Fornax |
Right ascension | 03h 39m 35.220s[1] |
Declination | –35° 25′ 44.09″[1] |
Apparent magnitude (V) | 18.69 |
Characteristics | |
Spectral type | M9[1] |
Apparent magnitude (B) | ~20.17[1] |
Apparent magnitude (I) | ~13.288[1] |
Apparent magnitude (J) | 10.725±0.021[1] |
Apparent magnitude (H) | 10.017±0.021[1] |
Apparent magnitude (K) | 9.548±0.023[1] |
Astrometry | |
Proper motion (μ) | RA: 309.001±0.050[2] mas/yr Dec.: 269.058±0.064[2] mas/yr |
Parallax (π) | 155.5982 ± 0.0522 mas[2] |
Distance | 20.961 ± 0.007 ly (6.427 ± 0.002 pc) |
Absolute magnitude (MV) | 20.02 |
Details[3] | |
Mass | 0.06±0.04 M☉ |
Temperature | 2650±30 K |
Rotation | <4.5 h |
Rotational velocity (v sin i) | 28±4 km/s |
Age | 320 ±80 million years |
Other designations | |
LP 944-20, SIPS J0339−3525, LEHPM 3451, 2MASSI J0339352−352544, [B2006] J033935.2−352544, APMPM J0340−3526, 2MASS J03393521-3525440, 2MASSW J0339352−352544, BRI B0337−3535, BRI 0337−3535, 2MUCD 10201, Gaia DR2 4860376345833699840 | |
Database references | |
SIMBAD | data |
![]() ![]() LP 944-20 Location of LP 944-20 in the constellation Fornax |
Due to short rotational period, this young brown dwarf is displaying strong and frequent X-ray flares, and possessing a strong magnetic field reaching 135 G at the photosphere level.[3] On 15 December 1999 an X-ray flare was detected.[4][5] On 27 July 2000, radio emission (in flare and quiescence) was detected from this brown dwarf by a team of students at the Very Large Array.[6]
Observations published in 2007 showed that the atmosphere of LP 944-20 contains much lithium and that it has dusty clouds.[7]
Constellation of Fornax | |||||||||||
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