  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| κ For A | |
| Right ascension | 02h 22m 32.60343s[1] |
| Declination | −23° 48′ 00.4878″[1] |
| Apparent magnitude (V) | 5.3187 ± 0.0005 (system total)[2] |
| κ For Bab | |
| Right ascension | |
| Declination | |
| Apparent magnitude (V) | 10.21 ± 0.04 (subsystem total)[3] |
| Characteristics | |
| κ For A | |
| Spectral type | G1V-IV[note 1] |
| B−V color index | 0.608 ± 0.017 (system total)[2] |
| Kappa Fornacis Bab | |
| Spectral type | ~M0V / ~M0V[4] |
| Astrometry | |
| κ For A | |
| Radial velocity (Rv) | 16.67 ± 0.06[3] km/s |
| Proper motion (μ) | RA: 150.725[1] mas/yr Dec.: 5.364[1] mas/yr |
| Parallax (π) | 44.0905 ± 0.2799 mas[1] |
| Distance | 74.0 ± 0.5 ly (22.7 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.610 ± 0.039[note 2] |
| κ For Bab | |
| Absolute magnitude (MV) | 8.50 (subsystem total)[note 2] |
| Orbit[3] | |
| Primary | κ For A |
| Companion | κ For Bab |
| Period (P) | 25.81 ± 0.15 years |
| Semi-major axis (a) | 0.521 ± 0.004″ |
| Eccentricity (e) | 0.339 ± 0.013 |
| Inclination (i) | 50.4 ± 0.5° |
| Longitude of the node (Ω) | 139.8 ± 1.4° |
| Periastron epoch (T) | 1988.89 ± 0.17 |
| Argument of periastron (ω) (secondary) | 266.3 ± 1.0° |
| Semi-amplitude (K1) (primary) | 5.23 ± 0.13 km/s |
| Orbit[3] | |
| Primary | κ For Ba |
| Companion | κ For Bb |
| Period (P) | approx. 3.666 days |
| Eccentricity (e) | 0 (assumed) |
| Semi-amplitude (K1) (primary) | approx. 83 km/s |
| Semi-amplitude (K2) (secondary) | approx. 83 km/s |
| Details | |
| κ For A | |
| Mass | 1.20 ± 0.05[3] M☉ |
| Surface gravity (log g) | 3.99 ± 0.15[5] cgs |
| Temperature | 5853 ± 49[5] K |
| Metallicity [Fe/H] | -0.06 ± 0.05[5] dex |
| Age | 5.7 ± 0.6[6] Gyr |
| κ For Bab | |
| Mass | 1.05 ± 0.18 (subsystem total)[3][7]M☉ approx. 0.53 ± 0.09 / 0.53 ± 0.09 [8] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Fornacis (κ For) is a star system that lies approximately 72 light-years away. The system consists of a somewhat evolved primary orbited by a massive, 'dark' secondary that is actually itself a close red dwarf binary, making a hierarchal triple system.
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