Epsilon Andromedae
Epsilon Andromedae, Latinized from ε Andromedae, is a star in the constellation of Andromeda. It can be seen with the naked eye, having an apparent visual magnitude of 4.4. Based upon an annual parallax shift of 21.04 mas as seen from Earth, it is located 155 light years from the Sun. The system is moving closer to the Sun with a radial velocity of −84 km/s. Its orbit in the Milky Way is highly eccentric, causing it to move rapidly relative to the Sun and its neighboring stars.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 38m 33.34610s |
| Declination | +29° 18′ 42.3135″ |
| Apparent magnitude (V) | 4.357 |
| Characteristics | |
| Spectral type | G6 III Fe−3 CH1 |
| U−B color index | +0.463 |
| B−V color index | +0.8713 |
| V−R color index | +0.6 |
| R−I color index | +0.51 |
| Astrometry | |
| Radial velocity (Rv) | −84.43±0.15 km/s |
| Proper motion (μ) | RA: −229.04 mas/yr Dec.: −253.11 mas/yr |
| Parallax (π) | 19.91 ± 0.19 mas |
| Distance | 164 ± 2 ly (50.2 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.69 |
| Details | |
| Mass | 1.01±0.35 M☉ |
| Radius | 9.04±0.34 R☉ |
| Luminosity | 51.3 L☉ |
| Surface gravity (log g) | 2.88±0.02 cgs |
| Temperature | 5,082±20 K |
| Metallicity [Fe/H] | −0.53±0.05 dex |
| Rotational velocity (v sin i) | 1.70±0.45 km/s |
| Age | 5.71±5.29 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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