Psi Andromedae

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 1,000 light-years (310 parsecs) from Earth, with 14% margin of error.[1]

Psi Andromedae
Location of ψ Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 46m 02.04663s[1]
Declination +46° 25′ 12.9788″[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: +9.07[1] mas/yr
Dec.: -7.83[1] mas/yr
Parallax (π)3.25 ± 0.47[1] mas
Distanceapprox. 1,000 ly
(approx. 310 pc)
Absolute magnitude (MV)–3.039[3]
Details
ψ And A
Mass5.4[4] M☉
Radius686[5] R☉
Surface gravity (log g)1.50[3] cgs
Temperature4,990[3] K
Metallicity [Fe/H]+0.10[3] dex
Age79[4] Myr
Other designations
20 And, BD+45° 4321, FK5 1622, HD 223047, HIP 117221, HR 9003, SAO 53355[6]
Database references
SIMBADdata

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]

Naming

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]

gollark: No, eldræ are immortal in the sense of not naturally dying.
gollark: Luck and caution, probably.
gollark: John-117?
gollark: Possibly useful implications for farming and construction if they can expand the definition of tree enough.
gollark: Can they cut down all trees with herrings, or just the mightiest ones?

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133: 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788.
  4. Parsons, Sidney B. (May 2004), "New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions", The Astronomical Journal, 127 (5): 2915–2930, Bibcode:2004AJ....127.2915P, doi:10.1086/383546.
  5. Stassun K.G.; et al. (October 2019). "The revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4). arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  6. "* psi And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 January 2018.
  7. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日
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