Kappa Fornacis
Star system in the constellation Fornax / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Apparent magnitude (V) ...
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 |
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