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HD 72659

HD 72659
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]
Distance169.4 ± 0.2 ly
(51.93 ± 0.07 pc)
Absolute magnitude (MV)3.98[2]
Details[4]
Mass1.07±0.02 M☉
Radius1.38±0.02 R☉
Luminosity2.16±0.01 L☉
Surface gravity (log g)4.19±0.02 cgs
Temperature5,956±43 K
Metallicity [Fe/H]−0.04±0.01[2] dex
Rotational velocity (v sin i)5.1[5] km/s
Age7.0±0.7 Gyr
Other designations
BD−01°2075, Gaia DR2 3073443760538892032, HD 72659, HIP 42030, SAO 136045, 2MASS J08340320-0134056[6]
Database references
SIMBADdata

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]

The HD 72659 planetary system[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

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ "HD 72659". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-24.
  7. ^ 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.
  8. ^ 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. Archived from the original on 2019-12-07. Retrieved 2009-12-23.
  9. ^ 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.


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