83 Aquarii

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83 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg
Location of 83 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension  23h 05m 09.78684s[1]
Declination –07° 41′ 37.6853″[1]
Apparent magnitude (V) 5.43[2] (6.20/6.34)[3]
Spectral type F2 Vn + F2 V[3]
U−B color index +0.07[2]
B−V color index +0.30[2]
Radial velocity (Rv)–13[4] km/s
Proper motion (μ) RA: +122.41[1] mas/yr
Dec.: +7.11[1] mas/yr
Parallax (π)15.57 ± 0.61[1] mas
Distance209 ± 8 ly
(64 ± 3 pc)
Companion83 Aquarii B
Period (P)21.840 ± 0.019 yr
Semi-major axis (a)0.2026 ± 0.0007
Eccentricity (e)0.3878 ± 0.0025
Inclination (i)48.01 ± 0.42°
Longitude of the node (Ω)204.87 ± 0.50°
Periastron epoch (T)1983.108 ± 0.022
Argument of periastron (ω)
82.83 ± 0.45°
Other designations
BD–08 6018, HD 218060, HIP 113996, HR 8782, SAO 146498.[6]
Database references

83 Aquarii (abbreviated 83 Aqr) is a binary star system in the equatorial constellation of Aquarius. 83 Aquarii is its Flamsteed designation, though it also bears the Bayer designation of h Aquarii. The combined apparent visual magnitude of the pair is 5.43,[2] which is faintly visible to the naked eye. Based upon an annual parallax shift of 15.57 milliarcseconds,[1] it is located at a distance of around 209 light-years (64 parsecs) from Earth.

Both stars are F-type main sequence stars.[3] The first component has an apparent magnitude of 6.20; the second is magnitude 6.34.[3] They are orbiting each other with a period of 21.84 years with an eccentricity of 0.388.[5]


  1. ^ a b c d e f van Leeuwen, F. (November 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.
  2. ^ a b c d Nicolet, B. (October 1978), "Catalogue of homogeneous data in the UBV photoelectric photometric system", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. ^ a b c d 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.
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. ^ a b Hartkopf, W. I.; Mason, B. D.; McAlister, H. A. (1996), "Binary star orbits from speckle interferometry. VIII. Orbits of 37 close visual systems", Astronomical Journal, 111: 370–392, Bibcode:1996AJ....111..370H, doi:10.1086/117790.
  6. ^ "* 83 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-07-14.

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