Delta Geminorum
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 07h 20m 07.37978s |
| Declination | +21° 58′ 56.3377″ |
| Apparent magnitude (V) | +3.53 |
| Characteristics | |
| Spectral type | F0 IV |
| U−B color index | +0.04 |
| B−V color index | +0.34 |
| Astrometry | |
| Radial velocity (Rv) | +4.1 km/s |
| Proper motion (μ) | RA: –15.13 mas/yr Dec.: –9.79 mas/yr |
| Parallax (π) | 53.94±0.66 mas |
| Distance | 60.5 ± 0.7 ly (18.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.95 |
| Orbit | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 2,238.7 days |
| Eccentricity (e) | 0.3530 |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | ~550 yr |
| Semi-major axis (a) | 13.8±1.6″ |
| Eccentricity (e) | 0.98±0.30 |
| Inclination (i) | 75±10° |
| Longitude of the node (Ω) | 128±51° |
| Periastron epoch (T) | 2136±57 |
| Argument of periastron (ω) (secondary) | 266±32° |
| Details | |
| Mass | 1.57 M☉ |
| Radius | 2.31 R☉ |
| Luminosity | 9.88 L☉ |
| Temperature | 6,900 K |
| Metallicity [Fe/H] | –0.26 dex |
| Rotational velocity (v sin i) | 129.7 km/s |
| Age | 1.6 Gyr |
| Other designations | |
| Wasat, 55 Geminorum, BD+22°1645, FK5 279, Gl 271, HD 56986, HIP 35550, HR 2777, SAO 79294. | |
| Database references | |
| SIMBAD | data |
Delta Geminorum (δ Geminorum, abbreviated Delta Gem, δ Gem), formally named Wasat /ˈweɪsət/, is a triple star system in the constellation of Gemini.