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Zeta Aurigae
Binary star system in the constellation Auriga / From Wikipedia, the free encyclopedia
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Zeta Aurigae, or ζ Aurigae, is a binary star system in the northern constellation of Auriga. Based upon parallax measurements, this system is approximately 860 light-years (260 parsecs) distant from the Sun.[6] It has a combined apparent visual magnitude of 3.75,[2] which is bright enough to be seen with the naked eye.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 02m 28.69085s[1] |
Declination | +41° 04′ 32.9342″[1] |
Apparent magnitude (V) | 3.751[2] (3.70 - 3.97[3]) |
Characteristics | |
Spectral type | K5II (or K5Ib[4]) + B7 V[5] |
U−B color index | +0.374[2] |
B−V color index | +1.293[2] |
R−I color index | 0.87 |
Variable type | Algol[3] |
Astrometry | |
Radial velocity (Rv) | +12.11[4] km/s |
Proper motion (μ) | RA: +6.872[1] mas/yr Dec.: -15.567[1] mas/yr |
Parallax (π) | 3.791 ± 0.05 mas[6] |
Distance | 860 ± 10 ly (264 ± 3 pc) |
Absolute magnitude (MV) | −3.21[7] |
Orbit[8] | |
Period (P) | 972.162 d |
Semi-major axis (a) | 905 R☉ |
Eccentricity (e) | 0.3973 ± 0.0007 |
Inclination (i) | 87.0° |
Periastron epoch (T) | RJD 53039.9 ± 0.10 |
Argument of periastron (ω) (secondary) | 328.9° ± 0.13° |
Semi-amplitude (K1) (primary) | 23.17 ± 0.02 km/s |
Details | |
ζ Aur A | |
Mass | 5.8±0.2[9] M☉ |
Radius | 148±3[9] R☉ |
Luminosity | 4,786[4] L☉ |
Surface gravity (log g) | 1.33[10] cgs |
Temperature | 3,960±100[9] K |
Metallicity [Fe/H] | –0.26[10] dex |
Rotational velocity (v sin i) | 5.7±1[4] km/s |
ζ Aur B | |
Mass | 4.8±0.2[9] M☉ |
Radius | 4.5±0.5[9] R☉ |
Temperature | 15,200±200[9] K |
Other designations | |
Database references | |
SIMBAD | data |
Close
The two components are designated Zeta Aurigae A (officially named Saclateni /sækləˈtiːni/,[12] an old misspelling of "Sadatoni")[citation needed] and B.