| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17 34 36.69409 |
| Declination | +09° 35′ 12.1005″ |
| Apparent magnitude (V) | 5.80 (5.82 + 7.8) |
| Characteristics | |
| Spectral type | A2 V + A8 IV |
| Astrometry | |
| 53 Oph A | |
| Radial velocity (Rv) | −13.9±2.9 km/s |
| Proper motion (μ) | RA: +2.126 mas/yr Dec.: −8.530 mas/yr |
| Parallax (π) | 8.8060 ± 0.0978 mas |
| Distance | 370 ± 4 ly (114 ± 1 pc) |
| 53 Oph B | |
| Proper motion (μ) | RA: +1.794 mas/yr Dec.: −8.148 mas/yr |
| Parallax (π) | 8.8979 ± 0.0413 mas |
| Distance | 367 ± 2 ly (112.4 ± 0.5 pc) |
| Details | |
| 53 Oph Aa | |
| Mass | 2.50±0.05 M☉ |
| Radius | 1.7 R☉ |
| Luminosity | 56.4+5.3 −4.9 L☉ |
| Surface gravity (log g) | 3.90 cgs |
| Temperature | 9,311+173 −170 K |
| Metallicity | 0.21 dex |
| Rotational velocity (v sin i) | 29 km/s |
| 53 Oph B | |
| Radius | 1.72+0.06 −0.03 R☉ |
| Luminosity | 7.74±0.05 L☉ |
| Temperature | 7,344+124 −152 K |
| Rotational velocity (v sin i) | 140 km/s |
| Other designations | |
| f Oph, 53 Oph, HD 159480, HIP 85998, HR 6548, WDS J17346+0935 | |
| 53 Oph A: BD+09°3424, GC 23824, SAO 122526 | |
| 53 Oph B: BD+09°3423, GC 23823, SAO 122525 | |
| Database references | |
| SIMBAD | data |
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. Located around 370 light years distant from the Sun based on parallax, it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s. As of 2011, the visible components had an angular separation of 41.28″ along a position angle of 190°. 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.
The magnitude 5.82 primary, designated component Aa, is an A-type main-sequence star with a stellar classification of A2 V. It has 2.5 times the mass of the Sun and about 1.7 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. The widely spaced secondary, designated component B, is a magnitude 7.8 A-type subgiant star with a class of A8 IV.
References
- ^ 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.
- 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.
- ^ 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.
- ^ Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics, 19: 91, Bibcode:1975A&AS...19...91L.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "f Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-21.
- "BD+09 3423". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-21.
- 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, 45.
