51 Aquilae

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51 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 50m 46.78324s[1]
Declination −10° 45′ 48.6319″[1]
Apparent magnitude (V) 5.39[2]
Spectral type F5 V Fe-1 CH-0.7[3]
B−V color index +0.38[2]
Radial velocity (Rv) +6[4] km/s
Proper motion (μ) RA: -33.35[1] mas/yr
Dec.: +32.88[1] mas/yr
Parallax (π) 35.88 ± 0.35[1] mas
Distance 90.9 ± 0.9 ly
(27.9 ± 0.3 pc)
Absolute magnitude (MV) 3.16[5]
Surface gravity (log g) 4.16[3] cgs
Temperature 6,812[3] K
Metallicity [Fe/H] –0.18[3] dex
Rotational velocity (v sin i) 77.5[6] km/s
Age 1.6[5] Gyr
Other designations
BD-11° 5149, FK5 744, HD 187532, HIP 97650, HR 7553, SAO 163036.[7]
Database references

51 Aquilae (abbreviated 51 Aql) is a star in the equatorial constellation of Aquila. 51 Aquilae is its Flamsteed designation. It has an apparent visual magnitude of 5.39,[2] which means it is faintly visible to the naked eye. Based upon an annual parallax shift of 35.88 mas,[1] the distance to this star is around 90.9 light-years (27.9 parsecs).

This is an F-type main sequence star with a stellar classification of F5 V Fe-1 CH-0.7;[3] where the 'Fe-1' and 'CH-0.7' represent abundance deficiencies of iron and the molecule CN, respectively. It is about 1.6[5] billion years old and is spinning relatively quickly with a projected rotational velocity of 77.5 km/s.[6] The outer atmosphere has an effective temperature of 6,812 K,[3] giving it the yellow-white hue characteristic of an F-type star.[8]


  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, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C. 
  3. ^ a b c d e f Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770Freely accessible, doi:10.1086/504637. 
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W. 
  5. ^ a b c Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982Freely accessible, doi:10.1051/0004-6361/200811191. 
  6. ^ a b Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377. 
  7. ^ "51 Aql -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-27. 
  8. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16 

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