Gamma Andromedae
Star in the constellation Andromeda / From Wikipedia, the free encyclopedia
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Not to be confused with Y Andromedae.
"Alamak" redirects here. For the Singaporean comedian, see Henry Thia.
Gamma Andromedae, Latinized from γ Andromedae, is the third-brightest point of light in the northern constellation of Andromeda. It is a multiple star system approximately 350 light-years from Earth. The system is drifting closer to the Sun with a radial velocity in the range of −12 to −14 km/s.[5]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Andromeda |
Right ascension | 02h 03m 53.95229s[1] |
Declination | +42° 19′ 47.0223″[1] |
Apparent magnitude (V) | 2.27[2] |
Characteristics | |
Evolutionary stage | Candidate post-AGB[3] |
Spectral type | K2+IIb[4] |
U−B color index | +1.58[2] |
B−V color index | +1.37[2] |
R−I color index | +0.68[2] |
Astrometry | |
Radial velocity (Rv) | −11.7±0.9[5] km/s |
Proper motion (μ) | RA: 42.32[1] mas/yr Dec.: −49.30[1] mas/yr |
Parallax (π) | 8.30 ± 1.04 mas[1] |
Distance | approx. 390 ly (approx. 120 pc) |
Details | |
Radius | 97[6] R☉ |
Luminosity | 2,000[7] L☉ |
Surface gravity (log g) | 1.03[8] cgs |
Temperature | 4,248[8] K |
Metallicity [Fe/H] | −0.06[3] dex |
Rotational velocity (v sin i) | < 17[2] km/s |
Orbit[9] | |
Primary | γ1 Andromedae |
Companion | γ2 Andromedae |
Period (P) | 4,748 yr |
Other designations | |
Database references | |
SIMBAD | data |
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