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]
| 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] |
| Distance | 287.2 ± 0.4 ly (88.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.62[1] |
| Details | |
| Mass | 1.147±0.030[5] M☉ |
| Radius | 1.128±0.074[5] R☉ |
| Luminosity | 1.443[6] L☉ |
| Surface gravity (log g) | 4.365±0.054[5] cgs |
| Temperature | 5,907±52[5] K |
| Metallicity [Fe/H] | 0.29±0.07[5] dex |
| Rotational velocity (v sin i) | 2.6[6] km/s |
| Age | 6.2 Gyr[6] 1.622±1.369[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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
editIt 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]
| 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
edit- ^ a b c d e f g h i 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 c d e 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 Houk, N. (1978). "Michigan Catalogue of two dimensional spectral types for the HD stars". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
- ^ a b 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.
- ^ a b c d e f g h i j k 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.
- ^ a b c d e 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.
- ^ "HD 152079". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-27.
- ^ a b 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.