| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 21m 46.12968s[1] |
| Declination | +53° 27′ 07.8456″[1] |
| Apparent magnitude (V) | 5.34[2] |
| Characteristics | |
| Spectral type | F5 V[3][2] |
| B−Vcolor index | 0.448±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.4±0.1[4] km/s |
| Proper motion (μ) | RA: +21.98[1]mas/yr Dec.: -88.69[1]mas/yr |
| Parallax (π) | 16.89±0.30 mas[1] |
| Distance | 193 ± 3 ly (59 ± 1 pc) |
| Absolute magnitude (MV) | 1.48[2] |
| Orbit[5] | |
| Period (P) | 6.5011 d |
| Eccentricity (e) | 0.000 |
| Periastronepoch (T) | 2444496.869 ± 0.006 JD |
| Argument of periastron (ω) (secondary) | 0.000° |
| Semi-amplitude (K1) (primary) | 32.0±0.2 km/s |
| Details | |
| 45 Aur A | |
| Mass | 1.20[6] M☉ |
| Luminosity | 21.72[2] L☉ |
| Surface gravity (log g) | 3.57±0.14[6] cgs |
| Temperature | 6,489±221[6] K |
| Metallicity [Fe/H] | 0.23±0.03[2] dex |
| Rotational velocity (v sin i) | 14[7] km/s |
| Age | 1.561[6] Gyr |
| Other designations | |
| 45 Aur,BD+53° 1008,FK5 2484,GC 8151,HD 43905,HIP 30247,HR 2264,SAO 25681,PPM 30377,PLX 1468.2,TYC 3764-2617-1[8] | |
| Database references | |
| SIMBAD | data |
45 Aurigae orPLX 1468.2 is abinary star[5] system in the northernconstellation ofAuriga. It has anapparent visual magnitude of 5.34,[2] making it visible to the naked eye under suitable viewing conditions. An annualparallax shift of 16.89 mas as seen from Earth's orbit indicates the system is located about 193 light years from the Sun.
This is a close, single-linedspectroscopic binary with a circularized orbit with a shortperiod of 6.5 days.[5] They have a meanangular separation of 0.963 mas.[9] The visible component has astellar classification of F5 V,[3] matching anF-type main-sequence star that is generating energy throughhydrogen fusion at itcore. It is about 1.6[6] billion years old and is spinning with aprojected rotational velocity of 14 K.[7] It has 1.2[6] times themass of the Sun and is radiating 22[2] times theSun's luminosity from itsphotosphere at aneffective temperature of around 6,489 K.[6] The secondary has a minimum mass of 42% of the Sun's mass.[9]
