58 Aquarii

58 Aquarii, abbreviated 58 Aqr, is a star in the constellation of Aquarius. 58 Aquarii is its Flamsteed designation. It is a sixth magnitude star with an apparent visual magnitude of 6.39,[2] which means it is a challenge to view with the naked eye. Based upon an annual parallax shift of 13.4 mas,[1] it is located 243 light years from the Sun. This has been identified as a visual binary system with an orbital period of 829.976 days (2.27 years)[10] in a circular orbit (eccentricity of zero).[11]

58 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 31m 41.31672s[1]
Declination −10° 54′ 19.8148″[1]
Apparent magnitude (V) 6.39[2]
Characteristics
Spectral type A9/F0 V[3] or A8 III[4]
B−V color index 0.290±0.009[2]
Astrometry
Radial velocity (Rv)+4.0±4.3[5] km/s
Proper motion (μ) RA: +77.347[1] mas/yr
Dec.: −52.472[1] mas/yr
Parallax (π)13.4137 ± 0.1535[1] mas
Distance243 ± 3 ly
(74.6 ± 0.9 pc)
Absolute magnitude (MV)2.12[2]
Details[6]
Mass1.734±0.107 M☉
Radius2.059+0.305
−0.164 R☉
Luminosity11.73[2] L☉
Surface gravity (log g)4.040+0.065
−0.104 cgs
Temperature7,477+377
−528 K
Metallicity [Fe/H]0.014+0.150
−0.120 dex
Rotational velocity (v sin i)30.0±10.0[7] km/s
Age1.086[8] Gyr
Other designations
CD−11° 5855, GC 31468, HD 213464, HIP 111200, HR 8583, SAO 165147[9]
Database references
SIMBADdata

The primary component has a stellar classification of A9/F0 V,[3] matching a main sequence star with a spectrum showing mixed traits of an A/F-type. (Cowley and Fraquelli [1974] has previously assigned it a giant star class of A8 III.)[4] It is a chemically peculiar Am star, showing metallic lines with no magnetic field.[7] The star has 1.7 times the mass of the Sun and 2.1 times the Sun's radius. It is radiating 12 times the Sun's luminosity from its photosphere at an effective temperature of 7,477 K.[6]

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.
  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. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. Cowley, A.; Fraquelli, D. (1974), "MK Spectral Types for Some Bright F Stars", Publications of the Astronomical Society of the Pacific, 86 (509): 70, Bibcode:1974PASP...86...70C, doi:10.1086/129562.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  6. Huber, Daniel; et al. (2016), "The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8", The Astrophysical Journal Supplement Series, 224 (1): 2, arXiv:1512.02643, Bibcode:2016ApJS..224....2H, doi:10.3847/0067-0049/224/1/2, S2CID 118621218.
  7. Paunzen, E.; et al. (February 2013), "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 429 (1): 119–125, arXiv:1211.1535, Bibcode:2013MNRAS.429..119P, doi:10.1093/mnras/sts318, S2CID 119231581.
  8. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  9. "58 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 24, 2018.
  10. Abt, Helmut A.; Boonyarak, Chayan (November 2004), "Tidal Effects in Binaries of Various Periods", The Astrophysical Journal, 616 (1): 562–566, Bibcode:2004ApJ...616..562A, doi:10.1086/423795.
  11. Abt, Helmut A. (August 2005), "Observed Orbital Eccentricities", The Astrophysical Journal, 629 (1): 507–511, Bibcode:2005ApJ...629..507A, doi:10.1086/431207.
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