Epsilon Equulei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 20h 59m 04.47539s |
| Declination | +04° 17′ 36.5211″ |
| Apparent magnitude (V) | 5.23 (5.96 / 6.31) |
| Characteristics | |
| Spectral type | F5(V) + F6(V) |
| U−B color index | +0.00 |
| B−V color index | +0.47 |
| Astrometry | |
| Radial velocity (Rv) | 8.20 ± 0.2 km/s |
| Proper motion (μ) | RA: -115.75 mas/yr Dec.: -151.70 mas/yr |
| Parallax (π) | 18.49±1.35 mas |
| Distance | 180 ± 10 ly (54 ± 4 pc) |
| Absolute magnitude (MV) | +1.65 |
| Orbit | |
| Period (P) | 101.485 yr |
| Semi-major axis (a) | 0.6474″ |
| Eccentricity (e) | 0.705 |
| Inclination (i) | 92.17° |
| Longitude of the node (Ω) | 105.15° |
| Periastron epoch (T) | 1920.37 |
| Argument of periastron (ω) (secondary) | 340.19° |
| Details | |
| A | |
| Mass | 1.74 M☉ |
| Surface gravity (log g) | 3.87 cgs |
| Temperature | 6,223 K |
| B | |
| Mass | 1.53 M☉ |
| Surface gravity (log g) | 4.29 cgs |
| Temperature | 6,399 K |
| Age | 1.5 Gyr |
| Other designations | |
| ε Equ, 1 Equulei, HD 199766, HIP 103569, HR 8034, SAO 126428, BD+03°4473 | |
| Database references | |
| SIMBAD | data |
Epsilon Equulei, Latinized from ε Equulei, is a star system of apparent magnitude +5.23 in the constellation of Equuleus. It is located 180 light years away from the Solar System, based on its parallax.