Rho Andromedae
Rho Andromedae, Latinized from ρ Andromedae, is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.19, which, according to the Bortle Dark-Sky Scale, is bright enough to be seen with the naked eye from dark suburban skies. Based upon parallax measurements, this star is at a distance of approximately 162 light-years (50 parsecs) from the Sun. It is drifting further away with a radial velocity of +10 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 21m 07.26896s |
| Declination | +37° 58′ 06.9727″ |
| Apparent magnitude (V) | +5.19 |
| Characteristics | |
| Spectral type | F5IV-V |
| U−B color index | +0.039 |
| B−V color index | +0.424 |
| Astrometry | |
| Radial velocity (Rv) | +10.4±0.6 km/s |
| Proper motion (μ) | RA: +57.599 mas/yr Dec.: –38.378 mas/yr |
| Parallax (π) | 20.1874 ± 0.1179 mas |
| Distance | 161.6 ± 0.9 ly (49.5 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.73 |
| Details | |
| Radius | 3.37+0.07 −0.03 R☉ |
| Luminosity | 17.93±0.13 L☉ |
| Surface gravity (log g) | 3.84 cgs |
| Temperature | 6,471+25 −66 K |
| Metallicity [Fe/H] | –0.09 dex |
| Rotational velocity (v sin i) | 44 km/s |
| Age | 1.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is F5IV-V, showing mixed spectral features of a main sequence and subgiant stage. It is about 1.3 billion years old with 3.4 times the girth of the Sun and is spinning with a projected rotational velocity of 44 km/s. The outer envelope is radiating around 18 times the luminosity of the Sun from its photosphere at an effective temperature of 6,471 K, giving it the yellow-white hue of an F-type star. X-ray emissions were detected from this star during the EXOSAT mission.