HD 43691
Star in the constellation Auriga
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HD 43691 is a star with an orbiting exoplanet in the constellation Auriga. With an apparent visual magnitude of 8.03,[1] it is too faint to be visible to the naked eye. This system is located at a distance of 279 light years based on parallax measurements, but is drifting closer with a heliocentric radial velocity of −29 km/s.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 19m 34.676s[2] |
| Declination | +41° 05′ 32.30″[2] |
| Apparent magnitude (V) | 8.03[1] |
| Characteristics | |
| Evolutionary stage | subgiant[2] |
| Spectral type | G0 IV[3] |
| B−V color index | 0.596±0.015[1] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | −28.97±0.02[1] km/s |
| Proper motion (μ) | RA: 22.684 mas/yr[2] Dec.: −53.140 mas/yr[2] |
| Parallax (π) | 11.6726±0.0346 mas[2] |
| Distance | 279.4 ± 0.8 ly (85.7 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.52[1] |
| Details | |
| Mass | 1.32±0.09[4] M☉ |
| Radius | 1.704±0.023[4] R☉ |
| Luminosity | 2.24±0.02[5] L☉ |
| Surface gravity (log g) | 4.19±0.02[5] cgs |
| Temperature | 5,920±34[5] K |
| Metallicity [Fe/H] | 0.32±0.03[4] dex |
| Rotational velocity (v sin i) | 4.7[3] km/s |
| Age | 3.1±2.5[5] Gyr |
| Other designations | |
| BD+41°1415, HD 43691, HIP 30057, SAO 41025, PPM 48960, TYC 2930-2105-1, GSC 02930-02105, 2MASS J06193467+4105321[6] | |
| Database references | |
| SIMBAD | data |
This is a slightly evolved G-type subgiant star with a stellar classification of G0 IV.[3] It is ceasing thermonuclear fusion of hydrogen in its core and will expand to become a red giant. The star has 32% greater mass than the Sun and has a 70% larger girth.[4] It is radiating 2.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,920 K.[5] The level of chromospheric activity is minimal, allowing for accurate measurement of radial velocity variation.[3]
Planetary system
In July 2007, the star is found to have a super-jovian exoplanet in orbit around it.[3] 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 | ≥2.57+0.31 −0.34 MJ |
0.238+0.014 −0.016 |
36.99913+0.00095 −0.00092 |
0.085+0.012 −0.011 |
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