56 Aquilae

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56 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 54m 08.27579s[1]
Declination –08° 34′ 27.1575″[1]
Apparent magnitude (V) 5.79[2]
Spectral type K5 III[3]
U−B color index +2.00[2]
B−V color index +1.64[2]
Radial velocity (Rv) –49.5[4] km/s
Proper motion (μ) RA: +5.36[1] mas/yr
Dec.: –18.81[1] mas/yr
Parallax (π) 8.27 ± 1.06[1] mas
Distance approx. 390 ly
(approx. 120 pc)
Other designations
BD–08 5150, HD 188154, HIP 97928, RAFGL 5441S, HR 7584, SAO 143894.[5]

56 Aquilae (abbreviated 56 Aqr) is a star in the equatorial constellation of Aquila. 56 Aquilae is its Flamsteed designation. Its apparent magnitude is 5.76, meaning it would be barely visible to the naked eye, under ideal conditions. It was discovered by nineteenth Century Astronomer John Herschel.

56 Aquilae is a double star,[6] but it does not appear to be a binary star system.[3] It is one of the double stars profiled in Admiral William Henry Smyth's 1864 work, Sidereal Chromatics.


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752free to read, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c 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 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:0806.2878free to read. 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. ^ "56 Aql -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-27. 
  6. ^ Andrew James. "The application of Admiral Smyth's "Sidereal Chromatics"". Retrieved 2007-12-22. 

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