![]() Visible, blue and ultraviolet light curves for an eclipse of V2291 Ophiuchi, adapted from Griffin et al. (1995) [1] | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 18h 25m 38.799s [2] |
Declination | +08° 01′ 55.23″ [2] |
Apparent magnitude (V) | +5.64 [3] |
Characteristics | |
Spectral type | G9IIb / B8V |
Variable type | Zeta Aurigae-type |
Astrometry | |
Proper motion (μ) | RA: −3.920 [2] mas/yr Dec.: −6.549 [2] mas/yr |
Parallax (π) | 3.7061±0.1604 mas [2] |
Distance | 880 ± 40 ly (270 ± 10 pc) |
Absolute magnitude (MV) | –1.33 [3] |
Orbit | |
Period (P) | 1.055 [4] yr |
Semi-major axis (a) | 1.96 [4] AU |
Eccentricity (e) | 0.311 [4] |
Inclination (i) | 87 [4] ° |
Details | |
Mass | 3.86/2.95 [4] M☉ |
Radius | 33/3 [4] R☉ |
Luminosity | 562/146 L☉ |
Temperature | 4,900/11,600 [4] K |
Other designations | |
V2291 Oph, GSC 01023-02454, HD 169690, HD 169689, 2MASS J18253880+0801551, BD+07 3682, FK5 1478, PPM 165790, HIP 90313, SAO 123462 | |
Database references | |
SIMBAD | data |
HR 6902 (also designated V2291 Oph) is a binary system located 880 light years away from the Sun in the Ophiuchus constellation. The system includes an orange bright giant star and a B-type main sequence star, forming an eclipsing binary of Zeta Aurigae type. The system is also surrounded by a warm circumstellar envelope and the spectra show silicon and carbon absorption up to a distance of 3.3 giant radii. [4]