Triple star system in the constellation Andromeda
Psi Andromedae Location of ψ Andromedae (circled in red)
Observation dataEpoch 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] [ 4] U−Bcolor index +0.83[ 2] B−Vcolor index +1.085[ 3] Astrometry Radial velocity (Rv )-23.62[ 3] km/s Proper motion (μ)RA: [ 1] mas /yr Dec.: [ 1] mas /yr Parallax (π)1.6352± 0.1627 mas [ 1] Distance 2,000 ± 200 ly pc ) Absolute magnitude (MV )–3.039[ 3] Details ψ And A Mass 5.4[ 4] M ☉ Radius +8 [ 5] R ☉ Luminosity ± 161[ 6] L ☉ Surface gravity (log g )1.50[ 3] cgs Temperature ± 182[ 5] K Metallicity [Fe/H] +0.10[ 3] dex Age 79[ 4] Myr B Mass 2.6[ 4] M ☉ Temperature 11,000[ 4] K Other designations 20 And ,BD +45°4321FK5 1622HD 223047HIP 117221HR 9003SAO 53355PPM 64635[ 7] Database references SIMBAD data
Psi Andromedae (ψ And, ψ Andromedae) is theBayer designation for atriple star [ 4] constellation ofAndromeda . The combinedapparent visual magnitude of this system is 4.95.[ 2] parallax measurements, is roughly 2,000light-years (610parsecs ) from Earth.[ 1]
The primary component has astellar classification of G5 Ib,[ 3] spectrum of anevolved supergiant star. It forms a pair with a star of type B9 with an unknownluminosity class separated by 0.28arcseconds . A third component has a separation of 0.14 arcseconds. Details of the orbital arrangement remain uncertain.[ 4]
InChinese ,螣蛇 Téng Shé Flying Serpent 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 andι Andromedae ,. Consequently, theChinese name for ψ Andromedae itself is螣蛇二十 Téng Shé èrshí the Twentieth of Flying Serpent ).[ 8]
^a b c d e f Brown, A. G. A. ; et al. (Gaia collaboration) (2021)."Gaia Early Data Release 3: Summary of the contents and survey properties" .Astronomy & Astrophysics 649 : A1.arXiv :2012.01533 Bibcode :2021A&A...649A...1G .doi :10.1051/0004-6361/202039657 S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source atVizieR .^a b c Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars",Monthly Notices of the Royal Astronomical Society 133 (4):475– 493,Bibcode :1966MNRAS.133..475A ,doi :10.1093/mnras/133.4.475 ^a b c d e f g 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 ,S2CID 16602121 . ^a b c d e f g 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 ^a b Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (June 2025), "Vintage NPOI: New and Updated Angular Diameters for 145 Stars",The Astronomical Journal ,169 (6): 293,arXiv :2506.02912 Bibcode :2025AJ....169..293B ,doi :10.3847/1538-3881/adc930 ISSN 1538-3881 ^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars",Monthly Notices of the Royal Astronomical Society ,471 (1):770– 791,arXiv :1706.02208 Bibcode :2017MNRAS.471..770M ,doi :10.1093/mnras/stx1433 ISSN 0035-8711 Psi Andromedae's database entry atVizieR .^ "* psi And" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved28 January 2018 .^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at theWayback Machine
