| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 06m 35.09702s[1] |
| Declination | +38° 28′ 57.5204″[1] |
| Apparent magnitude (V) | 5.345[2] |
| Characteristics | |
| Spectral type | A4m[3] |
| U−Bcolor index | +0.11[4] |
| B−Vcolor index | +0.23[4] |
| Astrometry | |
| Radial velocity (Rv) | 16.90 ± 7.4[5] km/s |
| Proper motion (μ) | RA: 9.84[1]mas/yr Dec.: −52.54[1]mas/yr |
| Parallax (π) | 9.57±0.34 mas[1] |
| Distance | 340 ± 10 ly (104 ± 4 pc) |
| Orbit[3] | |
| Primary | 40 Aur A |
| Companion | 40 Aur B |
| Period (P) | 28.28 d |
| Eccentricity (e) | 0.56 |
| Periastronepoch (T) | JD 2420468.197 |
| Argument of periastron (ω) (secondary) | 178.4° |
| Semi-amplitude (K1) (primary) | 51.4 km/s |
| Semi-amplitude (K2) (secondary) | 62.5 km/s |
| Details[6] | |
| Surface gravity (log g) | 3.88 ± 0.08 cgs |
| Temperature | 7838 ± 52 K |
| Metallicity [Fe/H] | +0.35 ± 0.05 dex |
| Other designations | |
| HD 41357,GCRV 3828,IRAS 06031+3829,SBC7 265,2MASS J06063509+3828578,AG+38° 663,GSC 02925-00806,PLX 1403,TD1 5967,BD+38° 1377,HIC 28946,PPM Star Catalogue 71223,TYC 2925-806-1,FK5 2465,HIP 28946,ROT 972,UBV 6148,GC 7723,HR 2143,SAO 58749,uvby98 100041357. | |
| Database references | |
| SIMBAD | data |
40 Aurigae is abinary star in theconstellationAuriga. Itsapparent magnitude is 5.345,[2] meaning it can just barely be seen with the naked eye. Based onparallax estimates made by theHipparcos spacecraft, the system is located some 340light-years (104parsecs) away.[1]
40 Aurigae is aspectroscopic binary, meaning the two stars are too close to be individuallyresolved, but periodicDoppler shifts in theirspectra indicate there must beorbital motion. In this case, light from both stars can be detected and it is a double-lined spectroscopic binary.[3] The two have anorbital period of 28.28 days and a fairly higheccentricity of 0.56.[3] The primary star is anA-type main-sequence star and shows unusual absorption lines in its spectrum, so it is anAm star[3] with aneffective temperature of 7,838K.[6]
