| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 04m 29.94s [1] |
| Declination | +44° 15′ 37.6″ [1] |
| Apparent magnitude (V) | 6.734 |
| Characteristics | |
| Spectral type | F8V |
| B−V color index | 0.565 |
| Astrometry | |
| Radial velocity (Rv) | 32.8 ± 0.2 km/s |
| Proper motion (μ) | RA: 93.85 ± 0.47 [1] mas/yr Dec.: -152.79 ± 0.23 [1] mas/yr |
| Parallax (π) | 30.20 ± 0.44[1] mas |
| Distance | 108 ± 2 ly (33.1 ± 0.5 pc) |
| Absolute magnitude (MV) | 4.120 |
| Details | |
| Mass | 1.08 M☉ |
| Radius | 1.21 R☉ |
| Surface gravity (log g) | 20.6 g |
| Luminosity | 6 L☉ |
| Temperature | 5929 K |
| Metallicity | 19.4 % |
| Age | 1.48 G years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
HD 40979 is a yellow-white dwarf star about 109 light-years away in the constellation of Auriga. The star is a member of a multiple system: it has a companion HD 40979B which shares its proper motion and is located at a projected distance of 6400 AU from the primary. HD 40979B itself has a companion (designated HD 40979C) at a projected distance of 129 AU from star B, making the system a triple.
As of 2002, there is one extrasolar planet known to be orbiting around HD 40979A.[2]
Contents |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >3.83 ± 0.36 MJ | 0.855 ± 0.049 | 263.84 ± 0.71 | 0.269 ± 0.034 |