Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 00m 18.33887s [1] |
Declination | +39° 23′ 40.9241″ [1] |
Apparent magnitude (V) | 5.95 [2] (6.02 + 9.50) [3] |
Characteristics | |
Spectral type | F5 V [4] |
U−B color index | −0.03 [5] |
B−V color index | +0.42 [5] |
Astrometry | |
Radial velocity (Rv) | +6.0±1.3 [6] km/s |
Proper motion (μ) |
RA: −10.87
[1]
mas/
yr Dec.: −1.08 [1] mas/ yr |
Parallax (π) | 16.74 ± 0.71 mas [1] |
Distance | 195 ± 8
ly (60 ± 3 pc) |
Absolute magnitude (MV) | 2.07 [2] |
Orbit [7] | |
Period (P) | 1,598.04±50.35 yr |
Semi-major axis (a) | 5.379±0.388″ |
Eccentricity (e) | 0.536±0.031 |
Inclination (i) | 56.1±0.8° |
Longitude of the node (Ω) | 155.4±0.7° |
Periastron epoch (T) | 3,242.73±8.96 |
Argument of periastron (ω) (secondary) | 333.4±4.5° |
Details | |
5 Aur A | |
Mass | 1.48 [8] or 1.70 [7] M☉ |
Luminosity | 12.46 [2] L☉ |
Surface gravity (log g) | 4.14 [8] cgs |
Temperature | 6,603±225 [8] K |
Metallicity [Fe/H] | −0.02±0.07 [9] dex |
Age | 2.205 [8] Gyr |
5 Aur B | |
Mass | 0.82 [7] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
5 Aurigae is a triple star [7] system in the northern constellation of Auriga, [10] located about 195 light years away from the Sun based on parallax. [1] It is just visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.95. [2] The system is moving away from the Earth with a heliocentric radial velocity of +6 km/s, [6] having come within 62.4 light-years some 8.7 million years ago. [2]
This was initially discovered to be a binary star system by Otto Struve. The outer pair has an orbital period of 1,598 years with an eccentricity of 0.536. [7] The magnitude 6.02 [3] primary, component A, is itself a binary system consisting of two stars of similar mass, roughly 1.5 times the mass of the Sun each, with an orbital period of 8.08 years. [11] It has a stellar classification of F5 V, [4] matching an F-type main-sequence star.
As of 2017, component B is a magnitude 9.50 star at an angular separation of 4.10 ″ from the primary along a position angle of 285°. [3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 00m 18.33887s [1] |
Declination | +39° 23′ 40.9241″ [1] |
Apparent magnitude (V) | 5.95 [2] (6.02 + 9.50) [3] |
Characteristics | |
Spectral type | F5 V [4] |
U−B color index | −0.03 [5] |
B−V color index | +0.42 [5] |
Astrometry | |
Radial velocity (Rv) | +6.0±1.3 [6] km/s |
Proper motion (μ) |
RA: −10.87
[1]
mas/
yr Dec.: −1.08 [1] mas/ yr |
Parallax (π) | 16.74 ± 0.71 mas [1] |
Distance | 195 ± 8
ly (60 ± 3 pc) |
Absolute magnitude (MV) | 2.07 [2] |
Orbit [7] | |
Period (P) | 1,598.04±50.35 yr |
Semi-major axis (a) | 5.379±0.388″ |
Eccentricity (e) | 0.536±0.031 |
Inclination (i) | 56.1±0.8° |
Longitude of the node (Ω) | 155.4±0.7° |
Periastron epoch (T) | 3,242.73±8.96 |
Argument of periastron (ω) (secondary) | 333.4±4.5° |
Details | |
5 Aur A | |
Mass | 1.48 [8] or 1.70 [7] M☉ |
Luminosity | 12.46 [2] L☉ |
Surface gravity (log g) | 4.14 [8] cgs |
Temperature | 6,603±225 [8] K |
Metallicity [Fe/H] | −0.02±0.07 [9] dex |
Age | 2.205 [8] Gyr |
5 Aur B | |
Mass | 0.82 [7] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
5 Aurigae is a triple star [7] system in the northern constellation of Auriga, [10] located about 195 light years away from the Sun based on parallax. [1] It is just visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.95. [2] The system is moving away from the Earth with a heliocentric radial velocity of +6 km/s, [6] having come within 62.4 light-years some 8.7 million years ago. [2]
This was initially discovered to be a binary star system by Otto Struve. The outer pair has an orbital period of 1,598 years with an eccentricity of 0.536. [7] The magnitude 6.02 [3] primary, component A, is itself a binary system consisting of two stars of similar mass, roughly 1.5 times the mass of the Sun each, with an orbital period of 8.08 years. [11] It has a stellar classification of F5 V, [4] matching an F-type main-sequence star.
As of 2017, component B is a magnitude 9.50 star at an angular separation of 4.10 ″ from the primary along a position angle of 285°. [3]