Rho Aurigae

Not to be confused with R Aurigae.
ρ Aurigae
Location of ρ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 21m 48.41650s[1]
Declination +41° 48′ 16.4615″[1]
Apparent magnitude (V) +5.22[2]
Characteristics
Spectral type B5 V[3]
U−B color index −0.57[2]
B−V color index −0.14[2]
Astrometry
Radial velocity (Rv)+13.1[4] km/s
Proper motion (μ) RA: +14.42[1] mas/yr
Dec.: −37.32[1] mas/yr
Parallax (π)6.16 ± 0.36 mas[1]
Distance530 ± 30 ly
(162 ± 9 pc)
Orbit[5]
Period (P)34.49321 ± 0.00057 d
Eccentricity (e)0.104 ± 0.019
Periastron epoch (T)47,962.5 ± 2.0 JD
Argument of periastron (ω)
(secondary)		3.4 ± 12.0°
Semi-amplitude (K1)
(primary)		39.8 ± 0.8 km/s
Details
ρ Aur A
Mass5–7[5] M☉
Radius3.2–3.4[6] R☉
Rotational velocity (v sin i)55[7] km/s
ρ Aur B
Mass2–4[5] M☉
Other designations
20 Aurigae, BD+41 1162, FK5 2400, HD 34759, HIP 25048, HR 1749, SAO 40269[8]
Database references
SIMBADdata

Rho Aurigae (ρ Aur, ρ Aurigae) is the Bayer designation for a binary star system in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of +5.22.[2] Judging by parallax measurements, this system is approximately 530 light-years (160 parsecs) distant from the Earth, give or take a 30-light-year margin of error.[1]

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