5 Aquarii

5 Aquarii is a single[9] star in the zodiac constellation of Aquarius,[8] located about 830 light years away from the Sun,[1] based on parallax. 5 Aquarii is the Flamsteed designation. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.55.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.[4]

5 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 52m 08.69366s[1]
Declination −05° 30′ 25.4241″[1]
Apparent magnitude (V) 5.55[2]
Characteristics
Spectral type B9 III[3]
B−V color index −0.076±0.010[2]
Astrometry
Radial velocity (Rv)−2.6±0.6[4] km/s
Proper motion (μ) RA: +0.70[5] mas/yr
Dec.: −5.52[5] mas/yr
Parallax (π)3.9834 ± 0.1385[1] mas
Distance820 ± 30 ly
(251 ± 9 pc)
Absolute magnitude (MV)−0.94[2]
Details
Luminosity317.56[2] L☉
Surface gravity (log g)3.35[6] cgs
Temperature11,200[6] K
Metallicity [Fe/H]0.10[6] dex
Rotational velocity (v sin i)25[7] km/s
Other designations
5 Aqr, NSV 13360, BD−06° 5606, HD 198667, HIP 103005, HR 7985, SAO 144889[8]
Database references
SIMBADdata

This is a suspected chemically peculiar star[10][6] star with a stellar classification of B9 III,[3] although Adelman et al. (2004) consider it to be a normal star with near-solar elemental abundances.[11] It is relatively sharp-lined[11] with a projected rotational velocity of 25 km/s.[7] The star is radiating 318 times the luminosity of the Sun from its photosphere at an effective temperature of 11,200 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. 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.
  3. Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 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.
  5. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  6. Adelman, S. J. (April 1986), "Optical region elemental abundance analyses of B and A stars. V. The normal stars theta Leonis, tau Herculis, 14 Cygni and 5 Aquarii", Astronomy and Astrophysics Supplement Series, 64: 173−187, Bibcode:1986A&AS...64..173A.
  7. Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590
  8. "5 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-09.
  9. 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
  10. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars" (PDF), Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
  11. Adelman, Saul J.; et al. (December 2004), "Elemental abundance studies using the EBASIM spectrograph of the 2.1-m CASLEO Observatory telescope. I. The normal stars 5 Aqr and 30 Peg", in Zverko, J.; Ziznovsky, J.; Adelman, S. J.; Weiss, W. W. (eds.), The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004., IAU Symposium, Cambridge, UK: Cambridge University Press, pp. 530–532, Bibcode:2004IAUS..224..530A, doi:10.1017/S1743921305009282
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