Astronomy:53 Ophiuchi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| 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[6] mas |
| 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 | |
| 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 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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 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 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 4.2 4.3 Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics 19: 91, Bibcode: 1975A&AS...19...91L.
- ↑ 5.0 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 7.0 7.1 7.2 7.3 7.4 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, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 8.0 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): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 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.
- ↑ 10.0 10.1 "f Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Oph.
- ↑ "BD+09 3423". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B09+3423.
- ↑ Mason, Brian D. et al. (August 2011), "Speckle Interferometry at the U.S. Naval Observatory. XVII.", The Astronomical Journal 142 (2): 4, doi:10.1088/0004-6256/142/2/46, 46, Bibcode: 2011AJ....142...46M.
- ↑ 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, doi:10.1088/0004-6256/141/2/45, 45, Bibcode: 2011AJ....141...45H.
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