18 Aurigae is a star located 233[1] light years away from the Sun in the northern constellation of Auriga.[9] The brightness of this object is near the limit of visibility to the naked eye under good viewing conditions, appearing as a dim, white-hued star with an apparent visual magnitude of 6.49.[2] The star is moving away from the Sun with a heliocentric radial velocity of 7 km/s.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 19m 23.75342s[1] |
Declination | +33° 59′ 07.4035″[1] |
Apparent magnitude (V) | 6.489[2] |
Characteristics | |
Spectral type | A7 V[3] |
U−B color index | +0.09[4] |
B−V color index | +0.256±0.007[5] |
Astrometry | |
Radial velocity (Rv) | 7.3±2[6] km/s |
Proper motion (μ) | RA: +28.497[1] mas/yr Dec.: −12.714[1] mas/yr |
Parallax (π) | 14.0275 ± 0.0668 mas[1] |
Distance | 233 ± 1 ly (71.3 ± 0.3 pc) |
Absolute magnitude (MV) | 2.31[5] |
Details | |
Mass | 1.69±0.03[7] M☉ |
Radius | 1.92+0.12 −0.03[1] R☉ |
Luminosity | 10.091±0.063[1] L☉ |
Surface gravity (log g) | 4.26±0.14 cgs |
Temperature | 7,432+231 −67[1] K |
Rotational velocity (v sin i) | 124[7] km/s |
Age | 950[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an ordinary A-type main-sequence star with a stellar classification of A7 V,[3] which indicates it is generating energy by hydrogen fusion at its core. The object is 950[8] million years old with a high rate of spin, showing a projected rotational velocity of 124 km/s.[7] It has 1.7[7] times the mass of the Sun and 1.9[1] times the Sun's radius. The star is radiating 10[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,432 K.[1]
18 Aurigae has a magnitude 12.50 companion star at an angular separation of 3.90″ along a position angle of 167°, as of 2006.[10]