Psi Andromedae

Psi Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
Location of ψ Andromedae (circled)
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]
Distance2,000 ± 200 ly
(610 ± 60 pc)
Absolute magnitude (MV)–3.039[3]
Details
ψ And A
Mass5.4[4] M☉
Radius47.58[5] R☉
Luminosity1,049±161[5] L☉
Surface gravity (log g)1.50[3] cgs
Temperature4,990[3] K
Metallicity [Fe/H]+0.10[3] dex
Age79[4] Myr
B
Mass2.6[4] M☉
Temperature11,000[4] K
Other designations
20 And, BD+45° 4321, FK5 1622, HD 223047, HIP 117221, HR 9003, SAO 53355, PPM 64635[6]
Database references
SIMBADdata

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.[1]

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]

  1. ^ a b c d e f Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference mnras133_475 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference aaa480_1_91 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference aj127_5_2915 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference tycho-gaia was invoked but never defined (see the help page).
  6. ^ "* psi And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 January 2018.