| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 34m 03.18984s [1] |
| Declination | −01° 34′ 05.5822″ [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) | −18.29±0.12 [1] km/s |
| Proper motion (μ) |
RA: −112.313±0.026
mas/
yr
[1] Dec.: −96.386±0.018 mas/ yr [1] |
| Parallax (π) | 19.2582 ± 0.0271 mas [1] |
| Distance | 169.4 ± 0.2
ly (51.93 ± 0.07 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 |
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 169.4 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 −18.3 km/s. [1]
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] In 2022, the inclination and true mass of HD 72659 b were measured via astrometry, along with the detection of a second substellar companion, likely a brown dwarf. [9]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 2.988+2.586 −0.098 MJ |
4.691+0.185 −0.202 |
9.718+0.052 −0.043 |
0.257+0.014 −0.016 |
77.583+39.898 −39.755 ° |
— |
| c | 18.806+4.442 −4.796 MJ |
13.959+0.884 −0.861 |
49.850+3.805 −3.287 |
0.091+0.055 −0.048 |
14.279+4.366 −2.678 ° |
— |
See also
References
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g 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.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode: 1999MSS...C05....0H.
- ^ a b c 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.
- ^ a b 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. S2CID 17608922.
- ^ 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.
- ^ a b Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv: 2208.12720. Bibcode: 2022ApJS..262...21F. doi: 10.3847/1538-4365/ac7e57. S2CID 251864022.
External links