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 |
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]
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]
In Chinese, 咸池 (Xián Chí), 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 咸池一 (Xián Chí yī, English: the First Star of Pool of Harmony). [10]
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 |
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]
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]
In Chinese, 咸池 (Xián Chí), 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 咸池一 (Xián Chí yī, English: the First Star of Pool of Harmony). [10]