Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 24m 39.14142s [1] |
Declination | +37° 23′ 07.2589″ [1] |
Apparent magnitude (V) | 4.99 [2] |
Characteristics | |
Spectral type | K4 III [3] |
U−B color index | +1.75 [2] |
B−V color index | +1.42 [2] |
Astrometry | |
Radial velocity (Rv) | –19.7 [4] km/s |
Proper motion (μ) |
RA: +0.71
[5]
mas/
yr Dec.: –11.51 [5] mas/ yr |
Parallax (π) | 6.2101 ± 0.2221 mas [1] |
Distance | 530 ± 20
ly (161 ± 6 pc) |
Absolute magnitude (MV) | −0.75 [6] |
Details | |
Radius | 43.72+1.08 −3.24 [1] R☉ |
Luminosity | 496±20 [1] L☉ |
Surface gravity (log g) | 1.75 [7] cgs |
Temperature | 4,120+162 −50 [1] K |
Metallicity [Fe/H] | –0.03 [7] dex |
Rotational velocity (v sin i) | 10 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Sigma Aurigae, Latinized from σ Aurigae, is a giant star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.99. [2] With an annual parallax shift of 6.21 mas, [5] it is approximately 530 light-years (160 parsecs) distant from the Earth. This is an evolved giant star with a stellar classification of K4 III. [3]
Sigma Aurigae has a 12th magnitude companion at an angular separation of 8 arcseconds, as well as two fainter companions at 28 and 35" respectively. [10] All are background objects, stars much further away than Sigma itself.
Sigma Aurigae, along with λ Aur and μ Aur, were Kazwini's Al Ḣibāʽ (ألحباع), the Tent. [11] According to the catalogue of stars in the Technical Memorandum 33-507 – A Reduced Star Catalog Containing 537 Named Stars, Al Ḣibāʽ were the title for three stars: λ Aur as Al Ḣibāʽ I, μ Aur as Al Ḣibāʽ II and σ Aur as Al Ḣibāʽ III. [12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 24m 39.14142s [1] |
Declination | +37° 23′ 07.2589″ [1] |
Apparent magnitude (V) | 4.99 [2] |
Characteristics | |
Spectral type | K4 III [3] |
U−B color index | +1.75 [2] |
B−V color index | +1.42 [2] |
Astrometry | |
Radial velocity (Rv) | –19.7 [4] km/s |
Proper motion (μ) |
RA: +0.71
[5]
mas/
yr Dec.: –11.51 [5] mas/ yr |
Parallax (π) | 6.2101 ± 0.2221 mas [1] |
Distance | 530 ± 20
ly (161 ± 6 pc) |
Absolute magnitude (MV) | −0.75 [6] |
Details | |
Radius | 43.72+1.08 −3.24 [1] R☉ |
Luminosity | 496±20 [1] L☉ |
Surface gravity (log g) | 1.75 [7] cgs |
Temperature | 4,120+162 −50 [1] K |
Metallicity [Fe/H] | –0.03 [7] dex |
Rotational velocity (v sin i) | 10 [8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Sigma Aurigae, Latinized from σ Aurigae, is a giant star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.99. [2] With an annual parallax shift of 6.21 mas, [5] it is approximately 530 light-years (160 parsecs) distant from the Earth. This is an evolved giant star with a stellar classification of K4 III. [3]
Sigma Aurigae has a 12th magnitude companion at an angular separation of 8 arcseconds, as well as two fainter companions at 28 and 35" respectively. [10] All are background objects, stars much further away than Sigma itself.
Sigma Aurigae, along with λ Aur and μ Aur, were Kazwini's Al Ḣibāʽ (ألحباع), the Tent. [11] According to the catalogue of stars in the Technical Memorandum 33-507 – A Reduced Star Catalog Containing 537 Named Stars, Al Ḣibāʽ were the title for three stars: λ Aur as Al Ḣibāʽ I, μ Aur as Al Ḣibāʽ II and σ Aur as Al Ḣibāʽ III. [12]