68 Aquilae

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68 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 28m 24.90515s[1]
Declination –03° 21′ 28.0518″[1]
Apparent magnitude (V) 6.12[2]
Characteristics
Spectral type B9 V[2]
U−B color index –0.20[2]
B−V color index –0.06[2]
Variable type Semiregular[citation needed]
Astrometry
Radial velocity (Rv) –9[3] km/s
Proper motion (μ) RA: +27.02[1] mas/yr
Dec.: –20.53[1] mas/yr
Parallax (π) 5.41 ± 0.42[1] mas
Distance 600 ± 50 ly
(180 ± 10 pc)
Details
Rotational velocity (v sin i) 138[4] km/s
Other designations
BD–03 4906, HD 194939, HIP 100977, HR 7821, SAO 144468.[5]

68 Aquilae is the Flamsteed designation for a double star in the equatorial constellation of Aquila. Its apparent magnitude is 6.12.

References[edit]

  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:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d 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. 
  3. ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E. 
  4. ^ 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/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  5. ^ "68 Aql -- Star in double system", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-26. 

External links[edit]