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Rho Aurigae
Binary star system in the constellation Auriga / From Wikipedia, the free encyclopedia
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Not to be confused with R Aurigae.
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]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 530 ± 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 | |
Mass | 5–7[5] M☉ |
Radius | 3.2–3.4[6] R☉ |
Rotational velocity (v sin i) | 55[7] km/s |
ρ Aur B | |
Mass | 2–4[5] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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