# 53 Ophiuchi

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Star system in the constellation Ophiuchus

53 Ophiuchi Observation data Epoch 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) −13.9±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 (114 ± 1 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 (112.4 ± 0.5 pc) Details 53 Oph Aa Mass 2.50±0.05[7] M☉ Radius 1.7[8] R☉ Luminosity 56.4+5.3 −4.9[7] L☉ Surface gravity (log g) 3.90[9] cgs Temperature 9,311+173 −170[7] K Metallicity [Fe/H] 0.21[9] dex Rotational velocity (v sin i) 29[7] km/s 53 Oph B Radius 1.72+0.06 −0.03[6] R☉ Luminosity 7.74±0.05[6] L☉ Temperature 7,344+124 −152[6] K Rotational velocity (v sin i) 140[4] km/s Other designations f Oph, 53 Oph, HD 159480, HIP 85998, HR 6548, WDS J17346+0935[10] 53 Oph A: BD+09°3424, GC 23824, SAO 122526[10] 53 Oph B: BD+09°3423, GC 23823, SAO 122525[11] Database references SIMBAD data

**53 Ophiuchi** is a multiple [star](/source/Star) system in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) of [Ophiuchus](/source/Ophiuchus). It is visible to the naked eye as a faint star with a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.80.[3] Located around 370 [light years](/source/Light_year) distant from the Sun based on [parallax](/source/Stellar_parallax),[1] it is moving closer to the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of −14 km/s.[5] As of 2011, the visible components had an [angular separation](/source/Angular_separation) of 41.28[″](/source/Second_of_arc) along a [position angle](/source/Position_angle) of 190°.[12] The primary may itself be a close binary system with a separation of 0.3692″ and a magnitude difference of 3.97 at an infrared wavelength of 562 nm.[13]

The magnitude 5.82[3] primary, designated component Aa, is an [A-type main-sequence star](/source/A-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of A2 V.[4] It has 2.5[7] times the [mass of the Sun](/source/Mass_of_the_Sun) and about 1.7[8] times the [Sun's radius](/source/Sun's_radius). The star is radiating 56 times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 9,311 K.[7] The widely spaced secondary, designated component B, is a magnitude 7.8[3] [A-type](/source/A-type_star) [subgiant star](/source/Subgiant_star) with a class of A8 IV.[4]

## References

1. ^ [***a***](#cite_ref-GaiaDR2A_1-0) [***b***](#cite_ref-GaiaDR2A_1-1) [***c***](#cite_ref-GaiaDR2A_1-2) [***d***](#cite_ref-GaiaDR2A_1-3) [***e***](#cite_ref-GaiaDR2A_1-4) [***f***](#cite_ref-GaiaDR2A_1-5) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%204490874571284776832) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-Anderson2012_2-0)** Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*, **38** (5): 331, [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971), [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A), [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-Eggleton2008_3-0) [***b***](#cite_ref-Eggleton2008_3-1) [***c***](#cite_ref-Eggleton2008_3-2) [***d***](#cite_ref-Eggleton2008_3-3) Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. ^ [***a***](#cite_ref-levato1975_4-0) [***b***](#cite_ref-levato1975_4-1) [***c***](#cite_ref-levato1975_4-2) [***d***](#cite_ref-levato1975_4-3) Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", *Astronomy and Astrophysics*, **19**: 91, [Bibcode](/source/Bibcode_(identifier)):[1975A&AS...19...91L](https://ui.adsabs.harvard.edu/abs/1975A&AS...19...91L).

1. ^ [***a***](#cite_ref-deBruijne2012_5-0) [***b***](#cite_ref-deBruijne2012_5-1) 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](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-GaiaDR2B_6-0) [***b***](#cite_ref-GaiaDR2B_6-1) [***c***](#cite_ref-GaiaDR2B_6-2) [***d***](#cite_ref-GaiaDR2B_6-3) [***e***](#cite_ref-GaiaDR2B_6-4) [***f***](#cite_ref-GaiaDR2B_6-5) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%204490827635882165248) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Zorec2012_7-0) [***b***](#cite_ref-Zorec2012_7-1) [***c***](#cite_ref-Zorec2012_7-2) [***d***](#cite_ref-Zorec2012_7-3) [***e***](#cite_ref-Zorec2012_7-4) [***f***](#cite_ref-Zorec2012_7-5) 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](/source/ArXiv_(identifier)):[1201.2052](https://arxiv.org/abs/1201.2052), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...537A.120Z](https://ui.adsabs.harvard.edu/abs/2012A&A...537A.120Z), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201117691](https://doi.org/10.1051%2F0004-6361%2F201117691), [S2CID](/source/S2CID_(identifier)) [55586789](https://api.semanticscholar.org/CorpusID:55586789).

1. ^ [***a***](#cite_ref-cadars_8-0) [***b***](#cite_ref-cadars_8-1) 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](/source/ArXiv_(identifier)):[astro-ph/0012289](https://arxiv.org/abs/astro-ph/0012289), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...367..521P](https://ui.adsabs.harvard.edu/abs/2001A&A...367..521P), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000451](https://doi.org/10.1051%2F0004-6361%3A20000451), [S2CID](/source/S2CID_(identifier)) [425754](https://api.semanticscholar.org/CorpusID:425754).

1. ^ [***a***](#cite_ref-Lemke1989_9-0) [***b***](#cite_ref-Lemke1989_9-1) Lemke, M. (November 1989), "Abundance anomalies in main sequence A stars. I. Iron and titanium", *Astronomy and Astrophysics*, **225**: 125–136, [Bibcode](/source/Bibcode_(identifier)):[1989A&A...225..125L](https://ui.adsabs.harvard.edu/abs/1989A&A...225..125L).

1. ^ [***a***](#cite_ref-SIMBAD1_10-0) [***b***](#cite_ref-SIMBAD1_10-1) ["f Oph"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Oph). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2019-06-21.

1. **[^](#cite_ref-SIMBAD2_11-0)** ["BD+09 3423"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B09+3423). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2019-06-21.

1. **[^](#cite_ref-Mason2011_12-0)** Mason, Brian D.; et al. (August 2011), "Speckle Interferometry at the U.S. Naval Observatory. XVII.", *The Astronomical Journal*, **142** (2): 4, [Bibcode](/source/Bibcode_(identifier)):[2011AJ....142...46M](https://ui.adsabs.harvard.edu/abs/2011AJ....142...46M), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/142/2/46](https://doi.org/10.1088%2F0004-6256%2F142%2F2%2F46), [S2CID](/source/S2CID_(identifier)) [250806722](https://api.semanticscholar.org/CorpusID:250806722), 46.

1. **[^](#cite_ref-Horch2011_13-0)** 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](/source/Bibcode_(identifier)):[2011AJ....141...45H](https://ui.adsabs.harvard.edu/abs/2011AJ....141...45H), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/141/2/45](https://doi.org/10.1088%2F0004-6256%2F141%2F2%2F45), 45.

v t e Constellation of Ophiuchus List of stars in Ophiuchus Ophiuchus in Chinese astronomy Taurus Poniatovii Stars Bayer α (Rasalhague) β (Cebalrai) γ (Bake-eo) δ (Yed Prior) ε (Yed Posterior) ζ η (Sabik) θ ι κ λ (Marfik) μ ν ξ ο ρ σ τ υ φ χ ψ ω e Flamsteed 12 14 15 16 18 19 20 21 23 24 26 28 29 30 31 36 (Guniibuu) 37 38 41 43 44 (b) 45 (d, θ Tel) 47 50 51 (c) 52 53 (f) 54 58 61 66 67 68 70 (p) 71 72 73 74 24 Sco 30 Sco Variable X RS V841 V849 V1054 V2052 V2291 V2293 V2306 V2307 V2500 (Barnard's Star) HR 6441 6516 6601 HD 148427 (Timir) 149143 (Rosalíadecastro) 149382 154088 164509 170469 171028 Other AS 209 CFHTWIR-Oph 98 CoRoT-6 CoRoT-25 CoRoT-26 CX330 Elias 2-27 Flying Saucer Gaia BH1 Gliese 673 GJ 1214 (Orkaria) GJ 3998 Great Annihilator IRAS 16293−2422 K2-32 M10-VLA1 MAXI J1659-152 MAXI J1820+070 Oph-IRS 48 RIK-210 SDSS 1624+00 SR 12 VB 8 VVV BD001 WISE 1800+0134 XTE J1739−285 Exoplanets CFHTWIR-Oph 98 b CoRoT-6b CoRoT-25b CoRoT-26b GJ 1214 b (Enaiposha) HD 149143 b (Riosar) HD 155233 b HD 156846 b HD 170469 b HD 171028 b ROXs 42Bb Wolf 1061b c d Star clusters NGC 6284 6287 6293 6304 6316 6325 6342 6355 6356 6366 6401 6426 6633 Other IC 4665 Melotte 186 Messier 9 Messier 10 Messier 12 Messier 14 Messier 19 Messier 62 Messier 107 Ophion Palomar 6 Nebulae NGC 6309 6369 6572 Other Barnard 68 Dark Horse Double Helix Nebula M2-9 Ophiuchus Superbubble Pipe Nebula Rho Ophiuchi cloud complex Serpens–Aquila Rift Sh 2-24 Sh 2-27 Snake Nebula Galaxies NGC 6240 6384 6509 6570 Other 3C 353 3C 368 IRAS 17208−0014 NeVe 1 PKS 1741−03 Galaxy clusters Abell 2163 Ophiuchus Supercluster Astronomical events Kepler's Supernova IGR J17329-2731 Category

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Adapted from the Wikipedia article [53 Ophiuchi](https://en.wikipedia.org/wiki/53_Ophiuchi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/53_Ophiuchi?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.