Star in the constellation Andromeda
22 Andromedae Location of 22 Andromedae (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Andromeda Right ascension 00h 10m 19.24653s [ 1] Declination +46° 04′ 20.1704″[ 1] Apparent magnitude (V)5.04[ 2] Characteristics Spectral type F5 II[ 3] F5 Ib–II metal-weak [ 4] B−Vcolor index +0.04[ 2] Astrometry Radial velocity (Rv )± 2.2[ 5] km/s Proper motion (μ)RA: 5.472[ 1] mas /yr Dec.: 0.086[ 1] mas /yr Parallax (π)2.2233± 0.3881 mas [ 1] Distance approx. 1,500 ly pc ) Absolute magnitude (MV )−3.51[ 6] Details Mass ± 0.4[ 3] M ☉ Radius 17[ 7] R ☉ Luminosity 1,436[ 8] L ☉ Surface gravity (log g )± 0.08[ 3] cgs Temperature ± 150[ 3] K Metallicity [Fe/H] ± 0.05[ 2] dex Rotational velocity (v sin i )46[ 9] Age 62[ 3] Myr Other designations 22 And ,BD +45°17FK5 4HD 571HIP 841HR 27SAO 36123PPM 42645[ 10] Database references SIMBAD data
22 Andromedae , abbreviated22 And , is a single[ 11] star in theconstellation Andromeda .22 Andromedae is theFlamsteed designation . It is visible to the naked eye with anapparent visual magnitude of 5.04.[ 2] parallax shift of justmas [ 1] light years away. It is moving closer to the Earth with a heliocentricradial velocity of −8.2 km/s.[ 5]
This is abright giant with astellar classification of F5 II.[ 3] metal-weak , with the metalliclines matching a class of F0 whereas hydrogen lines match an F5.[ 4] [ 3] projected rotational velocity of 46 km/s.[ 9] [ 3] mass of the Sun and has expanded to about 17[ 7] Sun's radius . It is radiating 1,436[ 8] Sun's luminosity from itsphotosphere at aneffective temperature of 6,270 km/s.[ 3]
^a b c d e f Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 ^a b c d Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version",Astronomy & Astrophysics ,591 : A118,arXiv :1605.07384 Bibcode :2016A&A...591A.118S ,doi :10.1051/0004-6361/201628497 ,S2CID 119258214 . ^a b c d e f g h i Lyubimkov, Leonid S.; et al. (2010), "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood",Monthly Notices of the Royal Astronomical Society 402 (2):1369– 79,arXiv :0911.1335 Bibcode :2010MNRAS.402.1369L ,doi :10.1111/j.1365-2966.2009.15979.x S2CID 119096173 . ^a b Gray, R. O.; et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars",The Astronomical Journal ,121 (4): 2148,Bibcode :2001AJ....121.2148G ,doi :10.1086/319956 ^a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project",Astronomy & Astrophysics ,546 : 14,arXiv :1208.3048 Bibcode :2012A&A...546A..61D ,doi :10.1051/0004-6361/201219219 ,S2CID 59451347 , A61. ^ Kovtyukh, V. V.; et al. (2012), "Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants",Monthly Notices of the Royal Astronomical Society ,423 (4):3268– 3273,arXiv :1204.4115 Bibcode :2012MNRAS.423.3268K ,doi :10.1111/j.1365-2966.2012.21117.x ISSN 0035-8711 ,S2CID 118683158 . ^a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)",Astronomy and Astrophysics ,367 (2) (Third ed.):521– 524,arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P ,doi :10.1051/0004-6361:20000451 ,S2CID 425754 . ^a b Hohle, M.M.; et al. (2010), "Masses and luminosities of O- and B-type stars and red supergiants",Astronomische Nachrichten ,331 (4): 349,arXiv :1003.2335 Bibcode :2010AN....331..349H ,doi :10.1002/asna.200911355 ,S2CID 111387483 . ^a b Danziger, I. J.; Faber, S. M. (May 1972), "Rotation of evolving A and F stars",Astronomy and Astrophysics ,18 : 428,Bibcode :1972A&A....18..428D . ^ "22 And" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedSeptember 21, 2018 .^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society 389 (2):869– 879,arXiv :0806.2878 Bibcode :2008MNRAS.389..869E ,doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 .
