Zeta Aurigae

ζ Aurigae
Location of ζ Aurigae (circled)
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]
Distance860 ± 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
Mass5.8±0.2[9] M☉
Radius148±3[9] R☉
Luminosity4,786[4] L☉
Surface gravity (log g)1.33[10] cgs
Temperature3,960±100[9] K
Metallicity [Fe/H]–0.26[10] dex
Rotational velocity (v sin i)5.7±1[4] km/s
ζ Aur B
Mass4.8±0.2[9] M☉
Radius4.5±0.5[9] R☉
Temperature15,200±200[9] K
Other designations
Saclateni, ζ Aur, Zeta Aur, 8 Aurigae, BD+40°1142, FK5 1137, HD 32068, HIP 23453, HR 1612, SAO 39966, WDS 05025+4105[11]
Database references
SIMBADdata

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.

The two components are designated Zeta Aurigae A (officially named Saclateni /sækləˈtiːni/,[12] an old misspelling of "Sadatoni")[citation needed] and B.

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