Psi Andromedae

Psi Andromedae

Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings File:Cercle rouge 100%.svg Location of ψ Andromedae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	4.95
Characteristics
Spectral type	G5 Ib + B9
U−B Template:Engvar	+0.83
B−V Template:Engvar	+1.085
Astrometry
Radial velocity (Rv)	-23.62 km/s
Proper motion (μ)	RA:  mas/yr Dec.:  mas/yr
Parallax (π)	1.6352±0.1627 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	–3.039
Details
ψ And A
Mass	5.4 Template:Solar mass
Radius	Template:Solar radius
Luminosity	Template:Solar luminosity
Surface gravity (log g)	1.50 cgs
Temperature	K
Metallicity [Fe/H]	+0.10 dex
Age	79 Myr
B
Mass	2.6 Template:Solar mass
Temperature	11,000 K
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

Psi Andromedae (ψ And, ψ Andromedae) is the Bayer designation for a triple star system in the northern constellation of Andromeda. The combined apparent visual magnitude of this system is 4.95. Based upon parallax measurements, is roughly from Earth.

The primary component has a stellar classification of G5 Ib, 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.

Naming

In Chinese, (), 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 (, Template:Langx).