51 Aquarii

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51 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 24m 06.88433s[1]
Declination –04° 50′ 13.2692″[1]
Apparent magnitude (V) 5.78[2]
Spectral type A0 V[3]
U−B color index –0.11[2]
B−V color index –0.04[2]
Radial velocity (Rv) +6[4] km/s
Proper motion (μ) RA: +26.90[1] mas/yr
Dec.: –7.35[1] mas/yr
Parallax (π) 8.04 ± 0.63[1] mas
Distance 410 ± 30 ly
(124 ± 10 pc)
Rotational velocity (v sin i) 91[5] km/s
Other designations
BD–05 5780, HD 212404, HIP 110578, HR 8533, SAO 146067.[6]
Database references

51 Aquarii (abbreviated 51 Aqr) is a star in the equatorial constellation of Aquarius. 51 Aquarii is its Flamsteed designation. It has an apparent visual magnitude is 5.78[2] and is located around 410 light-years (130 parsecs) from Earth.[1] This is an A-type main sequence star with a stellar classification of A0 V.[3] It has a high rate of rotation with a projected rotational velocity of 91 km/s.[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:0708.1752Freely accessible, 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819. 
  4. ^ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W. 
  5. ^ a b Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  6. ^ "51 Aqr -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-16 

External links[edit]