Zeta Capricorni
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 26m 40.02634s |
| Declination | −22° 24′ 40.8042″ |
| Apparent magnitude (V) | 3.77 |
| Characteristics | |
| Spectral type | G4Ib: Ba2 + DA2.2 |
| U−B color index | +0.57 |
| B−V color index | +0.99 |
| Variable type | Suspected eclipsing binary |
| Astrometry | |
| Radial velocity (Rv) | +2.1±0.1 km/s |
| Proper motion (μ) | RA: −2.23 mas/yr Dec.: 18.10 mas/yr |
| Parallax (π) | 8.46±0.21 mas |
| Distance | 386 ± 10 ly (118 ± 3 pc) |
| Absolute magnitude (MV) | −1.59 |
| Orbit | |
| Period (P) | 2,378.2 d |
| Semi-major axis (a) | 8.56±4.3 mas 1.00+1.69 −0.44 AU |
| Eccentricity (e) | 0.2821 |
| Inclination (i) | 111.7±20.7° |
| Longitude of the node (Ω) | 190.7±50.0° |
| Periastron epoch (T) | 2,445,996 JD |
| Argument of periastron (ω) (secondary) | 233.8±19.8° |
| Details | |
| A | |
| Mass | 4.5+0.3 −0.2 M☉ |
| Radius | ~29 R☉ |
| Luminosity | 561+180 −143 L☉ |
| Surface gravity (log g) | 1.7±0.3 cgs |
| Temperature | 5,269±53 K |
| Metallicity [Fe/H] | −0.09 dex |
| B | |
| Mass | 1.03 M☉ |
| Temperature | 23,000 K |
| Other designations | |
| ζ Cap, 34 Cap, NSV 25596, CD−22°15388, GC 30020, HD 204075, HIP 105881, HR 8204, SAO 190341, CCDM J21267-2225AB, WDS J21267-2225AB, WD 2123-226 | |
| Database references | |
| SIMBAD | data |
Zeta Capricorni, Latinised from ζ Capricorni, is a binary star system in the southern constellation of Capricornus. It is visible to the naked eye with an apparent visual magnitude of 3.77. The system is located at a distance of approximately 386 light-years from the Sun based on parallax. It is drifting further away with a radial velocity of +2 km/s. The absolute magnitude of this system is −1.59.