Ross 248
Ross 248, also called HH Andromedae or Gliese 905, is a small star approximately 10.30 light-years (3.16 parsecs) from Earth in the northern constellation of Andromeda. Despite its proximity it is too dim to be seen with the naked eye. It was first catalogued by Frank Elmore Ross in 1926 with his second list of proper-motion stars; on which count it ranks 261st in the SIMBAD database. It was too dim to be included in the Hipparcos survey. In about 40,000 years, Voyager 2 will pass 1.7 light-years (9.7 trillion miles) from the star.
Ross 248 Location of Ross 248 in the constellation Andromeda | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 41m 55.03630s |
| Declination | +44° 10′ 38.8189″ |
| Apparent magnitude (V) | 12.23 - 12.34 |
| Characteristics | |
| Spectral type | M6 V |
| U−B color index | +1.48 |
| B−V color index | +1.92 |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | −77.29±0.19 km/s |
| Proper motion (μ) | RA: 112.527±0.036 mas/yr Dec.: −1591.650±0.027 mas/yr |
| Parallax (π) | 316.4812 ± 0.0444 mas |
| Distance | 10.306 ± 0.001 ly (3.1597 ± 0.0004 pc) |
| Absolute magnitude (MV) | 14.79 |
| Details | |
| Mass | 0.145 M☉ |
| Radius | 0.190 R☉ |
| Luminosity | 0.0022 L☉ |
| Surface gravity (log g) | 5.13 cgs |
| Temperature | 2,930 K |
| Metallicity [Fe/H] | +0.23 dex |
| Rotation | 99.58 d |
| Rotational velocity (v sin i) | 0.1 km/s |
| Age | 2.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Within the next 80,000 years, Ross 248 is predicted to be the nearest star to the Sun for around 9,000 years, overtaking the current nearest star, the triple system Alpha Centauri.
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