Star system in the constellation Ophiuchus
53 Ophiuchi Observation dataEpoch J2000 Equinox J2000 Constellation Ophiuchus Right ascension 17h 34m 36.69409s [ 1] Declination +09° 35′ 12.1005″[ 1] Apparent magnitude (V)5.80[ 2] (5.82 + 7.8) [ 3] Characteristics Spectral type A2 V + A8 IV [ 4] Astrometry 53 Oph A Radial velocity (Rv )± 2.9[ 5] km/s Proper motion (μ)RA: +2.126[ 1] mas /yr Dec.: −8.530[ 1] mas /yr Parallax (π)8.8060± 0.0978 mas [ 1] Distance 370 ± 4 ly pc ) 53 Oph B Proper motion (μ)RA: +1.794[ 6] mas /yr Dec.: −8.148[ 6] mas /yr Parallax (π)8.8979 ± 0.0413 mas [ 6] Distance 367 ± 2 ly pc ) Details 53 Oph Aa Mass ± 0.05[ 7] M ☉ Radius 1.7[ 8] R ☉ Luminosity +5.3 [ 7] L ☉ Surface gravity (log g )3.90[ 9] cgs Temperature +173 [ 7] K Metallicity 0.21[ 9] dex Rotational velocity (v sin i )29[ 7] 53 Oph B Radius +0.06 [ 6] R ☉ Luminosity ± 0.05[ 6] L ☉ Temperature +124 [ 6] K Rotational velocity (v sin i )140[ 4] Other designations f Oph ,53 Oph ,HD 159480HIP 85998HR 6548WDS J17346+0935[ 10] 53 Oph A :BD +09°3424GC 23824SAO 122526[ 10] 53 Oph B :BD +09°3423GC 23823SAO 122525[ 11] Database references SIMBAD data
53 Ophiuchi is a multiplestar system in theequatorial constellation ofOphiuchus . It is visible to the naked eye as a faint star with a combinedapparent visual magnitude of 5.80.[ 3] light years distant from the Sun based onparallax ,[ 1] radial velocity of −14 km/s.[ 5] angular separation of″ position angle of 190°.[ 12] [ 13]
The magnitude 5.82[ 3] A-type main-sequence star with astellar classification of A2 V.[ 4] [ 7] mass of the Sun and about 1.7[ 8] Sun's radius . The star is radiating 56 times theSun's luminosity from itsphotosphere at aneffective temperature of 9,311 K.[ 7] [ 3] A-type subgiant star with a class of A8 IV.[ 4]
^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 Gaia DR2 record for this source atVizieR .^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation",Astronomy Letters ,38 (5): 331,arXiv :1108.4971 Bibcode :2012AstL...38..331A ,doi :10.1134/S1063773712050015 ,S2CID 119257644 . ^a b c d 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 . ^a b c d Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems",Astronomy and Astrophysics ,19 : 91,Bibcode :1975A&AS...19...91L . ^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. ^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 Gaia DR2 record for this source atVizieR .^a b c d e f Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities",Astronomy and Astrophysics ,537 : A120,arXiv :1201.2052 Bibcode :2012A&A...537A.120Z ,doi :10.1051/0004-6361/201117691 ,S2CID 55586789 . ^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 Lemke, M. (November 1989), "Abundance anomalies in main sequence A stars. I. Iron and titanium",Astronomy and Astrophysics ,225 :125– 136,Bibcode :1989A&A...225..125L . ^a b "f Oph" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-06-21 .^ "BD+09 3423" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-06-21 .^ Mason, Brian D.; et al. (August 2011), "Speckle Interferometry at the U.S. Naval Observatory. XVII.",The Astronomical Journal ,142 (2): 4,Bibcode :2011AJ....142...46M ,doi :10.1088/0004-6256/142/2/46 S2CID 250806722 , 46. ^ Horch, Elliott P.; et al. (February 2011), "Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June",The Astronomical Journal ,141 (2): 13,Bibcode :2011AJ....141...45H ,doi :10.1088/0004-6256/141/2/45
