HD 43691
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 19m 34.68s[1] |
| Declination | +41° 05′ 32.3″[1] |
| Apparent magnitude (V) | 8.03 |
| Characteristics | |
| Spectral type | G0IV |
| B−V color index | 0.596[2] |
| Astrometry | |
| Radial velocity (Rv) | -29.2 ± 0.2 km/s |
| Proper motion (μ) | RA: 23.12 ± 0.94[1] mas/yr Dec.: -51.92 ± 0.62[1] mas/yr |
| Parallax (π) | 12.44 ± 0.83[1] mas |
| Distance | 260 ± 20 ly (80 ± 5 pc) |
| Absolute magnitude (MV) | 8.57 |
| Details | |
| Mass | 1.38 ± 0.05[3] M☉ |
| Surface gravity (log g) | 4.28 ± 0.13[4] cgs |
| Temperature | 6200 ± 40 K |
| Metallicity | 28 ± 5 % |
| Age | 2.8 ± 0.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
HD 43691 is a G-type star with magnitude +8.03 located approximately 260 light-years away in the constellation Auriga. This yellow star is about to stop thermonuclear hydrogen-fusion in its core and eventually expand to become a red giant.
Planetary system
In July 2007, the star is found to have a giant planet in orbit around it.[4] It has minimum mass two and a half times that of Jupiter and orbits the star closer than Mercury to the Sun.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >2.49 MJ | 0.24 | 36.96 ± 0.02 | 0.14 ± 0.02 | — | — |
See also
References
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Coordinates: 
06h 19m 34.6771s, +41° 05′ 32.302″
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