HD 194244

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HD 194244
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 24m 37.49846s[1]
Declination +01° 04′ 06.2592″[1]
Apparent magnitude (V) 6.14[2]
Spectral type B9V[3]
U−B color index −0.14[2]
B−V color index −0.04[2]
Radial velocity (Rv) −9.6±0.9[4] km/s
Proper motion (μ) RA: +8.37[1] mas/yr
Dec.: +5.26[1] mas/yr
Parallax (π) 4.04 ± 0.39[1] mas
Distance 810 ± 80 ly
(250 ± 20 pc)
Luminosity 173[5] L
Temperature 8,822[5] K
Rotational velocity (v sin i) 222[6] km/s
Other designations
BD+00° 4495, HD 194244, HIP 100664, HR 7803, SAO 125769.
Database references
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 194244 is a variable Be star[7] in the equatorial constellation of Aquila. With an apparent magnitude of 6.14, according to the Bortle scale it is faintly visible to the naked eye from rural skies on a dark night.


  1. ^ a b c d e van Leeuwen, F. (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 Vizier catalog entry
  2. ^ a b c Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa 23: 175, Bibcode:1964MNSSA..23..175C 
  3. ^ 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. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x 
  6. ^ 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 
  7. ^ Neiner, C.; Hubert, A.-M.; Catala, C. (February 2005), "The Identification of New Be Stars in GAUDI", The Astrophysical Journal Supplement Series 156 (2): 237–243, Bibcode:2005ApJS..156..237N, doi:10.1086/426670 

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