Rho Aurigae

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ρ Aurigae
Template:Location mark
Location of ρ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +5.22[2]
Characteristics
Spectral type B5 V[3]
U−B Template:Engvar −0.57[2]
B−V Template:Engvar −0.14[2]
Astrometry
Radial velocity (Rv)+16.3±2.2[4] km/s
Proper motion (μ) RA: +15.053 mas/yr[1]
Dec.: −37.695 mas/yr[1]
Parallax (π)5.2029±0.1327 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[5]
Period (P)Script error: No such module "val".
Eccentricity (e)0.104±0.019
Periastron epoch (T)Script error: No such module "val".
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] Template:Solar mass
Radius3.2–3.4[6] Template:Solar radius
Rotational velocity (v sin i)55[7] km/s
ρ Aur B
Mass2–4[5] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Rho Aurigae is a binary star system in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ρ Aurigae, and abbreviated Rho Aur or ρ Aur. This system is faintly visible to the naked eye with an apparent visual magnitude of +5.22.[2] Judging by parallax measurements, this system is approximately Script error: No such module "convert". distant from the Earth, give or take a 20-light-year margin of error.[1] It is drifting further away from the Sun with a radial velocity of +16 km/s.[4]

ρ Aurigae is a single-lined spectroscopic binary system; the presence of a companion object is revealed by shifts in the stellar spectrum. The pair orbit each other with a period of 34.49 days and an orbital eccentricity of 0.10.[5]

The primary component of this system is a B-type main-sequence star defined as a standard star for the stellar classification of B5 V.[3] The deduced mass of the secondary and the lack of evidence for it in the spectrum suggest it may be a B- or A-type star somewhat less luminous than the primary.[5]

Name

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Pool of Harmony, refers to an asterism consisting of ρ Aurigae, λ Aurigae and HD 36041.[9] Consequently, the Chinese name for ρ Aurigae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[10]

References

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  5. ↑ a b c d e Script error: No such module "citation/CS1".
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  8. ↑ Template:Cite simbad
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".

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Further reading

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External links

Template:Stars of Auriga

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