Alpha Equulei
Alpha Equulei (α Equulei, abbreviated Alpha Equ, α Equ), officially named Kitalpha /kɪˈtælfə/, is a star in the constellation of Equuleus. It is a high proper-motion star only 190 light-years away.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 15m 49.43192s |
| Declination | +05° 14′ 52.2430″ |
| Apparent magnitude (V) | +3.919(4.49/4.96) |
| Characteristics | |
| Spectral type | G7III + kA3hA4mA9 |
| U−B color index | +0.284 |
| B−V color index | +0.529 |
| Astrometry | |
| Radial velocity (Rv) | −15.71 ± 0.05 km/s |
| Proper motion (μ) | RA: +59.88 ± 0.23 mas/yr Dec.: −94.09 ± 0.18 mas/yr |
| Parallax (π) | 17.14 ± 0.21 mas |
| Distance | 190 ± 2 ly (58.3 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.17 (0.71 + 1.18) |
| Orbit | |
| Period (P) | 98.8098 days |
| Eccentricity (e) | 0 |
| Semi-amplitude (K1) (primary) | 16.34 ± 0.07 km/s |
| Semi-amplitude (K2) (secondary) | 17.9 ± 0.3 km/s |
| Details | |
| A | |
| Mass | 2.3 M☉ |
| Radius | 9.2 R☉ |
| Luminosity | 52.5 L☉ |
| Temperature | 5,100 K |
| Rotational velocity (v sin i) | 20.0 km/s |
| B | |
| Mass | 2.0 M☉ |
| Radius | 2.6 R☉ |
| Luminosity | 26.3 L☉ |
| Temperature | 8.150 K |
| Age | 740 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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