Psi Andromedae (ψ And, ψ Andromedae) is the Bayer designation for a triple star[4] system in the northern constellation of Andromeda. The combined apparent visual magnitude of this system is 4.95.[2] Based upon parallax measurements, is roughly 2,000 light-years (610 parsecs) from Earth, with a large margin of error.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 46m 02.04703s[1] |
Declination | +46° 25′ 12.9865″[1] |
Apparent magnitude (V) | 4.95[2] |
Characteristics | |
Spectral type | G5 Ib[3] + B9[4] |
U−B color index | +0.83[2] |
B−V color index | +1.085[3] |
Astrometry | |
Radial velocity (Rv) | -23.62[3] km/s |
Proper motion (μ) | RA: 8.446(132)[1] mas/yr Dec.: −7.143(109)[1] mas/yr |
Parallax (π) | 1.6352 ± 0.1627 mas[1] |
Distance | 2,000 ± 200 ly (610 ± 60 pc) |
Absolute magnitude (MV) | –3.039[3] |
Details | |
ψ And A | |
Mass | 5.4[4] M☉ |
Radius | 68.6[5] R☉ |
Surface gravity (log g) | 1.50[3] cgs |
Temperature | 4,990[3] K |
Metallicity [Fe/H] | +0.10[3] dex |
Age | 79[4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The primary component has a stellar classification of G5 Ib,[3] which matches the spectrum of an evolved supergiant star. It forms a pair with a star of type B9 with an unknown luminosity class separated by 0.28 arcseconds. A third component has a separation of 0.14 arcseconds. Details of the orbital arrangement remain uncertain.[4]
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of ψ Andromedae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae and ι Andromedae,. Consequently, the Chinese name for ψ Andromedae itself is 螣蛇二十 (Téng Shé èrshí, English: the Twentieth of Flying Serpent).[7]