86 Aquarii

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86 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Cercle rouge 100%.svg

Location of 86 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 06m 40.84483s[1]
Declination –23° 44′ 35.2344″[1]
Apparent magnitude (V) +4.47[2]
Spectral type G8 III[3]
U−B color index +0.58[2]
B−V color index +0.90[2]
Radial velocity (Rv) +15.2[4] km/s
Proper motion (μ) RA: +58.86[1] mas/yr
Dec.: –1.74[1] mas/yr
Parallax (π) 15.08 ± 0.72[1] mas
Distance 220 ± 10 ly
(66 ± 3 pc)
Surface gravity (log g) 3.10[5] cgs
Temperature 4,900[5] K
Metallicity [Fe/H] –0.14[5] dex
Other designations
c01 Aquarii, CD–24 17497, HD 218240, HIP 114119, HR 8789, SAO 191651.[6]

86 Aquarii is the Flamsteed designation for a binary star[7] system in the equatorial constellation of Aquarius. It is faint but visible to the naked eye with an apparent visual magnitude of +4.47.[2] Based upon parallax measurements, the distance to this star is about 220 light-years (67 parsecs).[1]

The two components of this system have an angular separation of 0.25 arcseconds.[7] The brighter component is a giant star with a spectral classification of G8 III[3] and an apparent magnitude of 4.79.[7] The effective temperature of its outer atmosphere is 4,900 K,[5] giving it the yellowish glow of a G-type star.[8] The fainter component is a star of magnitude 6.77.[7]


  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. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N. 
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953QB901.W495...... 
  5. ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527. 
  6. ^ "86 Aqr -- Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-13. 
  7. ^ 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. 
  8. ^ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16 

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