VW Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 20h 37m 21.5439s |
| Declination | +75° 36′ 01.467″ |
| Apparent magnitude (V) | 7.30 – 7.84 |
| Characteristics | |
| A | |
| Spectral type | G8V |
| B | |
| Spectral type | K0V |
| Astrometry | |
| Proper motion (μ) | RA: +308.71 mas/yr Dec.: +540.86 mas/yr |
| Parallax (π) | 36.25±0.58 mas |
| Distance | 91.00 ± 0.95 ly (27.90±0.29 pc) |
| Details | |
| A | |
| Mass | 1.13 M☉ |
| Radius | 0.99 R☉ |
| Temperature | 5,050 K |
| Age | 9.029 Gyr |
| B | |
| Mass | 0.34 M☉ |
| Radius | 0.57 R☉ |
| Temperature | 5,342±15 K |
| Age | 9.029 Gyr |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 0.2783146 days |
| Semi-major axis (a) | (1.412±0.010)×106 km (2.030±0.014 R☉) |
| Inclination (i) | 62.86±0.04° |
| Other designations | |
| VW Cep, LHS 3565, SAO 9828, LTT 16039, BD+75 752, GJ 1255, GJ 9703, HD 197433, HIP 101750 | |
| Database references | |
| SIMBAD | data |
VW Cephei (VW Cep) is an eclipsing contact binary of W Ursae Majoris-type located roughly at 90.6 light years from the Sun, whose two component stars share a common outer layer. Because the two components share their outer layers, as the components of W Ursae Majoris do, they have the same stellar classification, and are classified as yellow G-type main sequence dwarfs. The components take 0.2783 days (roughly 6.7 hours) to revolve around a common barycentre.
Jan Schilt discovered that the star is an eclipsing variable, in 1926.