V1339 Aquilae

V1339 Aquilae

A light curve for V1339 Aquilae, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 50m 17.47943s
Declination +07° 54′ 08.6934″
Apparent magnitude (V) 6.484
Characteristics
Spectral type B2.5IVe
U−B color index -0.7
B−V color index -0.1
Variable type Be star
Astrometry
Radial velocity (Rv)-30.10 ± 5 km/s
Proper motion (μ) RA: -0.77 ± 0.39 mas/yr
Dec.: -5.44 ± 0.46 mas/yr
Parallax (π)1.89 ± 0.45 mas
Distanceapprox. 1,700 ly
(approx. 500 pc)
Details
Mass13.0[2] M☉
Radius7.7[2] R☉
Temperature23310[2] K
Other designations
SAO 125116, HD 187567, BD+07° 4252, HIP 97607, HR 7554.
Database references
SIMBADdata

V1339 Aquilae, also known as HD 187567, is a Be star in the constellation Aquila. At its brightest its apparent magnitude is 6.22,[3] making it barely visible to the naked eye at a location with very little light pollution. It is located just 8 arc seconds from the center of the open cluster NGC 6828.[4]

V1339 Aquilae was discovered to be a Be star in 1925 by P. W. Merrill, M. L. Humason and C. G. Burwell.[5] The star's variability was detected in 1966 by A. W. J. Cousins, R. Lake and R. H. Stoy,[6] and because of this it was given its variable star designation, V1339 Aquilae, in 1979.[7]

V1339 Aquilae is around 13 times as massive as the Sun and has 7.7 times its diameter.[2] Its binary nature was discovered by speckle interferometry in 1983, at the Kitt Peak 4 meter telescope. At the time of these speckle observations the stars were separated by 0.057 arc seconds.[8]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Catanzaro2013 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Zejda was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Merrill was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cousins was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Kholopov was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference McAlister was invoked but never defined (see the help page).