Epsilon Andromedae
Star in the constellation Andromeda / From Wikipedia, the free encyclopedia
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Epsilon Andromedae, Latinized from ε Andromedae, is a star in the constellation of Andromeda.[4] It can be seen with the naked eye, having an apparent visual magnitude of 4.4.[2] Based upon an annual parallax shift of 21.04 mas as seen from Earth,[1] 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.[6] Its orbit in the Milky Way is highly eccentric, causing it to move rapidly relative to the Sun and its neighboring stars.[8]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 38m 33.34610s[1] |
Declination | +29° 18′ 42.3135″[1] |
Apparent magnitude (V) | 4.357[2] |
Characteristics | |
Spectral type | G6 III Fe−3 CH1[3] |
U−B color index | +0.463[2] |
B−V color index | +0.8713[2] |
V−R color index | +0.6[4] |
R−I color index | +0.51[5] |
Astrometry | |
Radial velocity (Rv) | −84.43±0.15[6] km/s |
Proper motion (μ) | RA: −229.04[1] mas/yr Dec.: −253.11[1] mas/yr |
Parallax (π) | 19.91 ± 0.19 mas[1] |
Distance | 164 ± 2 ly (50.2 ± 0.5 pc) |
Absolute magnitude (MV) | +0.69[7] |
Details[6] | |
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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