Astronomy:HD 72659

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Short description: Star in the constellation of Hydra
HD 72659
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −96.386±0.018[1] mas/yr
Parallax (π)19.2582 ± 0.0271[1] mas
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. 1.0 1.1 1.2 1.3 1.4 1.5 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. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode1999MSS...C05....0H. 
  4. 4.0 4.1 4.2 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html. 
  5. 5.0 5.1 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode2017AJ....153...21L. 
  6. "HD 72659". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+72659. 
  7. Butler, R. Paul et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal 582 (1): 455–466. doi:10.1086/344570. Bibcode2003ApJ...582..455B. 
  8. Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode2006ApJ...646..505B. http://www.iop.org/EJ/article/0004-637X/646/1/505/64046.html. 
  9. 9.0 9.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode2022ApJS..262...21F. 

External links

Coordinates: Sky map 08h 34m 03.1895s, −01° 34′ 05.583″