V Sagittae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 20h 20m 14.691s |
| Declination | +21° 06′ 10.44″ |
| Apparent magnitude (V) | 8.6-13.9 |
| Characteristics | |
| Evolutionary stage | White dwarf (primary) |
| Spectral type | Be |
| Variable type | eclipsing and cataclysmic |
| Astrometry | |
| Proper motion (μ) | RA: −2.133 mas/yr Dec.: −6.489 mas/yr |
| Parallax (π) | 0.3310±0.0206 mas |
| Distance | 9,900 ± 600 ly (3,000 ± 200 pc) |
| Absolute magnitude (MV) | −2.2 |
| Orbit | |
| Period (P) | 12.34 hours |
| Semi-major axis (a) | 4.36 R☉ |
| Inclination (i) | 65–80° |
| Semi-amplitude (K1) (primary) | 320 km/s |
| Semi-amplitude (K2) (secondary) | 85 km/s |
| Details | |
| White dwarf (primary) | |
| Mass | 1.0 M☉ |
| Donor (secondary) | |
| Mass | 0.8–1.0 M☉ |
| Other designations | |
| AAVSO 1015+20, V Sge, GSC 01643-01764 | |
| Database references | |
| SIMBAD | data |
V Sagittae or V Sge is a cataclysmic variable in the constellation Sagitta. It is the only super soft X-ray source non-magnetic cataclysmic variable found so far. Lidiya Tseraskaya discovered the variability of this star, in 1902. It appeared with its variable star designation in Annie Jump Cannon's 1907 work Second catalogue of variable stars.