Ross 47 is a variable star of spectral type M4 located in the constellation Orion, 19 light-years from Earth.
Observation data Epoch J1950.0 Equinox J1950.0 | |
---|---|
Constellation | Orion |
Right ascension | 05h 42m 09.26769s[1] |
Declination | +12° 29′ 21.6048″[1] |
Apparent magnitude (V) | +11.48 - 11.55[2] |
Characteristics | |
Evolutionary stage | red dwarf |
Spectral type | M4V[3] |
U−B color index | +14.264 |
B−V color index | +13.130 |
Variable type | BY Dra[2] |
Astrometry | |
Radial velocity (Rv) | 106.06±0.18[1] km/s |
Proper motion (μ) | RA: +1,997.342[1] mas/yr Dec.: −1569.63[1] mas/yr |
Parallax (π) | 172.6762 ± 0.0286 mas[1] |
Distance | 18.888 ± 0.003 ly (5.7912 ± 0.0010 pc) |
Absolute magnitude (MV) | +12.73[4] |
Details | |
Mass | 0.218±0.005[5] M☉ |
Radius | 0.238±0.009[5] R☉ |
Luminosity | 0.006288±0.000094[5] L☉ |
Surface gravity (log g) | 4.44[1] cgs |
Temperature | 3,334+67 −63[5] K |
Metallicity [Fe/H] | −0.19±0.17[6] dex |
Rotation | 170[7] |
Rotational velocity (v sin i) | 3.1[8] km/s |
Age | 7.1[9] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Ross 47 Location of Ross 47 in the constellation Orion |