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 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.