LHS 1903
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 07h 11m 27.9427s |
| Declination | +48° 19′ 49.3991″ |
| Apparent magnitude (V) | 12.21 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | M0.5V or dM1.5 |
| Apparent magnitude (G) | 11.39 |
| Astrometry | |
| Radial velocity (Rv) | 30.83±0.41 km/s |
| Proper motion (μ) | RA: −92.924±0.018 mas/yr Dec.: −570.393±0.015 mas/yr |
| Parallax (π) | 28.0525±0.0242 mas |
| Distance | 116.3 ± 0.1 ly (35.65 ± 0.03 pc) |
| Absolute magnitude (MV) | +8.89 |
| Details | |
| Mass | 0.538+0.039 −0.030 M☉ |
| Radius | 0.539±0.014 R☉ |
| Luminosity | 0.05 L☉ |
| Surface gravity (log g) | 4.75±0.12 cgs |
| Temperature | 3664±70 K |
| Metallicity [Fe/H] | −0.11±0.09 dex |
| Rotation | ~40.8 d |
| Age | 7.08+2.87 −1.98 Gyr |
| Other designations | |
| HIP 34730, G 107-55, LSPM J0711+4819, NLTT 17491, TOI-1730, TIC 318022259, TYC 3396-1862-1, 2MASS J07112794+4819501, Gaia DR2 978086481343568128, Gaia DR3 978086481343568128 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
LHS 1903 is a red dwarf star located about 116 light years from Earth in the constellation Lynx, near to 21 Lyncis. It is thought to be a member of the Milky Way's thick disk.
It hosts four known exoplanets. Its planetary system has been described as "inside-out", as instead of the usual pattern where gas planets tend to form further out, its planets are arranged in a configuration where the innermost and outermost planets are rocky, while the middle planets are gas dwarfs.
The code LHS 1903 comes from the Luyten Half-Second catalogue – a list of stars with an annual proper motion of more than half a second, which was compiled by Willem Jacob Luyten in 1979. The four planets are lettered b, c, d and e, following exoplanet naming convention.