53 Ophiuchi

53 Ophiuchi is a multiple star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 5.80.[3] Located around 370 light years distant from the Sun based on parallax,[1] it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s.[5] As of 2011, the visible components had an angular separation of 41.28″ along a 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]

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[1] mas
Distance370 ± 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[6] mas
Distance367 ± 2 ly
(112.4 ± 0.5 pc)
Details
53 Oph Aa
Mass2.50±0.05[7] M☉
Radius1.7[8] R☉
Luminosity56.4+5.3
−4.9[7] L☉
Surface gravity (log g)3.90[9] cgs
Temperature9,311+173
−170[7] K
Metallicity [Fe/H]0.21[9] dex
Rotational velocity (v sin i)29[7] km/s
53 Oph B
Radius1.72+0.06
−0.03[6] R☉
Luminosity7.74±0.05[6] L☉
Temperature7,344+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
SIMBADdata

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

References
  1. 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 at VizieR.
  2. 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.
  3. 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.
  4. Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics, 19: 91, Bibcode:1975A&AS...19...91L.
  5. 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.
  6. 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 at VizieR.
  7. 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.
  8. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  9. 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.
  10. "f Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-21.
  11. "BD+09 3423". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-21.
  12. 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, 46.
  13. 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, 45.
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