V1339 Aquilae
| 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 |
| Distance | approx. 1,700 ly (approx. 500 pc) |
| Details | |
| Mass | 13.0 M☉ |
| Radius | 7.7 R☉ |
| Temperature | 23310 K |
| Other designations | |
| SAO 125116, HD 187567, BD+07° 4252, HIP 97607, HR 7554. | |
| Database references | |
| SIMBAD | data |
V1339 Aquilae, also known as HD 187567, is a Be star in the constellation Aquila. At its brightest its apparent magnitude is 6.22, 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.
V1339 Aquilae was discovered to be a Be star in 1925 by P. W. Merrill, M. L. Humason and C. G. Burwell. The star's variability was detected in 1966 by A. W. J. Cousins, R. Lake and R. H. Stoy, and because of this it was given its variable star designation, V1339 Aquilae, in 1979.
V1339 Aquilae is around 13 times as massive as the Sun and has 7.7 times its diameter. 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.