Astronomy:HD 152079

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Short description: Star in the constellation Ara
HD 152079
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas/yr
Dec.: −93.597[2] mas/yr
Parallax (π)11.3545 ± 0.0142[2] mas
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
Extrasolar Planets
Encyclopaedia
data

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. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  2. 2.0 2.1 2.2 2.3 2.4 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.
  3. 3.0 3.1 Houk, N. (1978). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey 2. Bibcode1978mcts.book.....H. 
  4. 4.0 4.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode2018A&A...616A...7S. 
  5. 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 Barbato, D. et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics 615: 21. doi:10.1051/0004-6361/201832791. A175. Bibcode2018A&A...615A.175B. 
  6. 6.0 6.1 6.2 6.3 6.4 Pavlenko, Y. V. et al. (2019). "Masses, oxygen, and carbon abundances in CHEPS dwarf stars". Astronomy & Astrophysics 621: A112. doi:10.1051/0004-6361/201834138. Bibcode2019A&A...621A.112P. 
  7. "HD 152079". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+152079. 
  8. 8.0 8.1 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. doi:10.1088/0004-637X/711/2/1229. Bibcode2010ApJ...711.1229A. 

Coordinates: Sky map 16h 53m 29.74s, −46° 19′ 58.6″