Astronomy:HD 43691
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 19m 34.676s[1] |
| Declination | +41° 05′ 32.30″[1] |
| Apparent magnitude (V) | 8.03[2] |
| Characteristics | |
| Spectral type | G0 IV[3] |
| B−V color index | 0.596±0.015[2] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | −28.97±0.02[2] km/s |
| Proper motion (μ) | RA: 22.684[1] mas/yr Dec.: −53.140[1] mas/yr |
| Parallax (π) | 11.6726 ± 0.0346[1] mas |
| Distance | 279.4 ± 0.8 ly (85.7 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.52[2] |
| 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 | |
| Database references | |
| SIMBAD | data |
HD 43691 is a star with an orbiting exoplanet in the constellation Auriga. With an apparent visual magnitude of 8.03,[2] 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.[2]
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 |
— | — |
See also
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 da Silva, Ronaldo et al. (October 2007). "ELODIE metallicity-biased search for transiting Hot Jupiters IV. Intermediate period planets orbiting the stars HD 43691 and HD 132406". Astronomy and Astrophysics 473 (1): 323–328. doi:10.1051/0004-6361:20077314. Bibcode: 2007A&A...473..323D.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Hill, Michelle L. et al. (2020). "Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems". The Astronomical Journal 159 (5): 197. doi:10.3847/1538-3881/ab7d33. Bibcode: 2020AJ....159..197H.
- ↑ 5.0 5.1 5.2 5.3 5.4 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B.
- ↑ "HD 43691". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+43691.
- ↑ Ment, Kristo et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal 156 (5): 213. doi:10.3847/1538-3881/aae1f5. Bibcode: 2018AJ....156..213M.
Coordinates: 
06h 19m 34.6771s, +41° 05′ 32.302″
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