Ross 154
Ross 154 Location of Ross 154 in the constellation Sagittarius | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 49m 49.36378s |
| Declination | −23° 50′ 10.4474″ |
| Apparent magnitude (V) | 10.44 |
| Characteristics | |
| Spectral type | M3.5V |
| B−V color index | 1.76 |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | −11.12±0.57 km/s |
| Proper motion (μ) | RA: +639.368 mas/yr Dec.: −193.958 mas/yr |
| Parallax (π) | 336.0266±0.0317 mas |
| Distance | 9.7063 ± 0.0009 ly (2.9760 ± 0.0003 pc) |
| Absolute magnitude (MV) | 13.07 |
| Details | |
| Mass | 0.177±0.004 M☉ |
| Radius | 0.200±0.008 R☉ |
| Luminosity | 0.004015±0.000048 L☉ |
| Surface gravity (log g) | 5.00±0.05 cgs |
| Temperature | 3,248+68 −66 K |
| Metallicity [Fe/H] | −0.25 dex |
| Rotation | 2.848±0.001 days |
| Rotational velocity (v sin i) | 3.5±1.5 km/s |
| Age | under 1 Gyr |
| Other designations | |
| CD−23°14742, GCTP 4338, GJ 729, HIP 92403, LHS 3414, V1216 Sagittarii | |
| Database references | |
| SIMBAD | data |
Ross 154 (V1216 Sgr) is a red dwarf star in the southern zodiac constellation of Sagittarius. It has an apparent visual magnitude of 10.44, making it much too faint to be seen with the naked eye. At a minimum, viewing Ross 154 requires a telescope with an aperture of 6.5 cm (3 in) under ideal conditions. The distance to this star can be estimated from parallax measurements, which places it at 9.71 light-years (2.98 parsecs) away from Earth. It is the nearest star in the southern constellation Sagittarius, and one of the nearest stars to the Sun.