HD 152079
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara[1]
Right ascension 16h 53m 05.755s[2]
Declination –46° 19′ 58.64″[2]
Apparent magnitude (V) 9.18[1]
Characteristics
Spectral type G6V[3]
Apparent magnitude (B) 9.891[1]
Apparent magnitude (J) 7.984±0.021[1]
Apparent magnitude (H) 7.656±0.031[1]
Apparent magnitude (K) 7.634±0.021[1]
B−V color index 0.711±0.025[1]
Astrometry
Radial velocity (Rv)−21.338±0.0007[4] km/s
Proper motion (μ) RA: −107.358 mas/yr[2]
Dec.: −93.597 mas/yr[2]
Parallax (π)11.3545 ± 0.0142 mas[2]
Distance287.2 ± 0.4 ly
(88.1 ± 0.1 pc)
Absolute magnitude (MV)4.62[1]
Details
Mass1.147±0.030[5] M☉
Radius1.128±0.074[5] R☉
Luminosity1.443[6] L☉
Surface gravity (log g)4.365±0.054[5] cgs
Temperature5,907±52[5] K
Metallicity [Fe/H]0.29±0.07[5] dex
Rotational velocity (v sin i)2.6[6] km/s
Age6.2 Gyr[6]
1.622±1.369[5] Gyr
Other designations
CD–46°11085, HIP 82632, SAO 227350, PPM 322323[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 152079 is a star with an orbiting exoplanet in the southern constellation of Ara. It is located at a distance of 287 light years from the Sun based on parallax measurements,[2] but is drifting closer with a radial velocity of −21 km/s.[4] At that distance the star is much too faint to be visible with the naked eye, having an apparent visual magnitude of 9.18.[1]

This is a G-type main-sequence star[8] with a stellar classification of G6V.[3] Age estimates range from 1.6[5] to 6.2[6] billion years. It has 1.15 times the mass of the Sun and 1.13 times the Sun's girth. This is a metal-rich star, having a higher iron abundance than in the Sun.[5] The star is radiating 1.44[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,907 K.[5]

Planetary system

It has one confirmed exoplanet, discovered in 2010 by the Magellan Planet Search Program. This is a super-jovian object with an eccentric orbit and a 8.0 yr orbital period.[8] In 2018, an analysis of HARPS data suggested the presence of an additional outer companion with a mass at least 83% of the mass of Jupiter.[5]

The HD 152079 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥ 2.661±0.046 MJ 4.187+0.051
−0.053		 2,918.92+37.87
−39.28		 0.532+0.015
−0.016		 — —

References

  1. 1 2 3 4 5 6 7 8 9 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.
  2. 1 2 3 4 5 6 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.
  3. 1 2 Houk, N. (1978). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
  4. 1 2 Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
  5. 1 2 3 4 5 6 7 8 9 10 11 Barbato, D.; et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics. 615: 21. arXiv:1804.08329. Bibcode:2018A&A...615A.175B. doi:10.1051/0004-6361/201832791. S2CID 119099721. A175.
  6. 1 2 3 4 5 Pavlenko, Y. V.; et al. (2019). "Masses, oxygen, and carbon abundances in CHEPS dwarf stars". Astronomy & Astrophysics. 621: A112. arXiv:1811.05011. Bibcode:2019A&A...621A.112P. doi:10.1051/0004-6361/201834138. S2CID 119103484.
  7. ↑ "HD 152079". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-27.
  8. 1 2 Arriagada, Pamela; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal. 711 (2): 1229–35. arXiv:1001.4093. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229. S2CID 118682009.
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