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 |
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.
HD 192685 varies slightly in brightness and is classified as a γ Cassiopeiae variable. [2]
From October to December 1982 the Hydrogen alpha absorption line increased in emission strength by 30%. [11] The line is partially filled by redshifted emission. [13]
HD 192685 has excess infrared emissions (12-100 μm) which are interpreted to be free-free radiation in the gas surrounding the star. [14]
It has at least one companion with separation 0.55" and magnitude 7.55, [15] and may also be a long-period spectroscopic binary. [16]
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 |
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.
HD 192685 varies slightly in brightness and is classified as a γ Cassiopeiae variable. [2]
From October to December 1982 the Hydrogen alpha absorption line increased in emission strength by 30%. [11] The line is partially filled by redshifted emission. [13]
HD 192685 has excess infrared emissions (12-100 μm) which are interpreted to be free-free radiation in the gas surrounding the star. [14]
It has at least one companion with separation 0.55" and magnitude 7.55, [15] and may also be a long-period spectroscopic binary. [16]