HD 72659
HD 72659 is a star in the equatorial constellation of Hydra. With an apparent visual magnitude of 7.46,[2] his yellow-hued star is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 169.5 light years from the Sun, and it has an absolute magnitude of 3.98.[2] The star is drifting closer with a radial velocity of −18.2 km/s.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 34m 03.19008s[1] |
| Declination | −01° 34′ 05.5793″[1] |
| Apparent magnitude (V) | 7.46[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| B−V color index | +0.612±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −18.222±0.0011[1] km/s |
| Proper motion (μ) | RA: −112.548[1] mas/yr Dec.: −96.579[1] mas/yr |
| Parallax (π) | 19.2410 ± 0.0533[1] mas |
| Distance | 169.5 ± 0.5 ly (52.0 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.98[2] |
| Details[4] | |
| Mass | 1.07±0.02 M☉ |
| Radius | 1.38±0.02 R☉ |
| Luminosity | 2.16±0.01 L☉ |
| Surface gravity (log g) | 4.19±0.02 cgs |
| Temperature | 5,956±43 K |
| Metallicity [Fe/H] | −0.04±0.01[2] dex |
| Rotational velocity (v sin i) | 5.1[5] km/s |
| Age | 7.0±0.7 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a Sun-like main sequence star with a stellar classification of G2V,[3] indicating that it is generating energy through core hydrogen fusion. It is older than the Sun with an age of about seven billion years,[4] and is spinning with a projected rotational velocity of 5.1 km/s.[5] The star has 7% greater mass than the Sun and a 38% larger radius. It is radiating more than double the Sun's luminosity from its photosphere at an effective temperature of 5,956 K.[4] The metallicity of the stellar atmosphere is similar to the Sun.[2]
Planetary system
An extrasolar planet was discovered orbiting this star in 2003 via the Doppler method.[7] This is a superjovian planet with an eccentric orbit, completing a lap around its host star every 9.9 years.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥3.30±0.29 MJ | 4.77±0.37 | 3,630±230 | 0.269±0.038 | — | — |
See also
- HD 73256
- List of extrasolar planets
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
- Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- "HD 72659". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-24.
- Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal. 582 (1): 455–466. Bibcode:2003ApJ...582..455B. CiteSeerX 10.1.1.7.6988. doi:10.1086/344570.
- Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. hdl:2299/1103. S2CID 119067572.