HD 192685
B-type star in the constellation Vulpecula / From Wikipedia, the free encyclopedia
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HD 192685, also known as QR Vulpeculae or HR 7739, is a Be star about 1,000 ly away in the Vulpecula constellation. It is visible to the naked eye.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vulpecula |
Right ascension | 20h 15m 15.89542s[1] |
Declination | 25° 35′ 31.0549″[1] |
Apparent magnitude (V) | 4.60 - 4.80[2] |
Characteristics | |
Spectral type | B3V[3] |
U−B color index | −0.73[4] |
B−V color index | −0.18[4] |
Variable type | γ Cas[2] |
Astrometry | |
Radial velocity (Rv) | −7.00[5] km/s |
Proper motion (μ) | RA: +6.93[1] mas/yr Dec.: −3.89[1] mas/yr |
Parallax (π) | 3.29 ± 0.51 mas[1] |
Distance | approx. 1,000 ly (approx. 300 pc) |
Absolute magnitude (MV) | −2.56[6] |
Details | |
Mass | 8.0[7] M☉ |
Luminosity | 3331[6] L☉ |
Surface gravity (log g) | 3.49[8] cgs |
Temperature | 18,700[9] K |
Metallicity [Fe/H] | −0.10[8] dex |
Rotational velocity (v sin i) | 160[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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