HD 171028

Last updated
HD 171028
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Ophiuchus
Right ascension 18h 32m 15.4933s [1]
Declination +06° 56′ 44.6858″ [1]
Apparent magnitude  (V)8.301 [2]
Characteristics
Spectral type G0 [3]
B−V color index 0.61 [3]
Astrometry
Radial velocity (Rv)+13.48±0.28 [1] km/s
Proper motion (μ)RA: −42.869±0.084 [1] mas/yr
Dec.: −14.705±0.077 [1] mas/yr
Parallax (π)8.9274±0.0497  mas [1]
Distance 365 ± 2  ly
(112.0 ± 0.6  pc)
Details
Mass 1.01±0.06 [2]   M☉
Radius 2.42+0.01
−0.03 [1]   R☉
Luminosity 5.406+0.042
−0.041 [1]   L☉
Surface gravity (log g)3.84±0.03 [2]   cgs
Temperature 5,671±16 [2]   K
Metallicity [Fe/H]−0.48±0.01 [2]   dex
Rotational velocity (v sin i)2.3 [3]  km/s
Age 4.890±0.229 [4]   Gyr
Other designations
BD+06 3833, TYC 458-1450-1, 2MASS J18321548+0656446 [5]
Database references
SIMBAD data

HD 171028 is a star with an exoplanet companion in the equatorial constellation of Ophiuchus. With an apparent visual magnitude of 8.3, [2] it is too faint to be readily visible with the naked eye. Unlike most planet-harboring stars, it does not have a Hipparcos number. The star is located at a distance of approximately 365  light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13.5 km/s. [1]

This is a yellow-hued G-type star of unknown luminosity class with a stellar classification of G0. [3] It is a metal-poor star belonging to the thin disk population. [6] HD 171028 is estimated to be nearly five billion years old and is spinning with a projected rotational velocity of 2.3 km/s. [3] It has the same mass as the Sun, but the radius is 2.4 times larger. The star is radiating 5.4 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 5,671 K. [2]

In the summer of 2007, a Jovian planetary companion was discovered by the HARPS planet search program using the radial velocity method. [3] This object is orbiting at a distance of 1.32  AU from the host star with a period of 1.5 years and an eccentricity (ovalness) of 0.59. Since the inclination of the orbit is unknown, only a minimum mass can be determined. This planet has at least double the mass of Jupiter. [7]

The HD 171028 planetary system [7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥1.98  MJ 1.32550±30.59±0.01——

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 6 7 Sousa, S. G.; et al. (February 2011). "Spectroscopic characterization of a sample of metal-poor solar-type stars from the HARPS planet search program. Precise spectroscopic parameters and mass estimation". Astronomy and Astrophysics. 526: 11. arXiv: 1012.1528 . Bibcode:2011A&A...526A..99S. doi:10.1051/0004-6361/201015646. S2CID   118785170. A99.
  3. 1 2 3 4 5 6 Santos, N. C.; et al. (2007). "The HARPS search for southern extra-solar planets. XII. A giant planet orbiting the metal-poor star HD 171028". Astronomy and Astrophysics. 474 (2): 647–651. arXiv: 0708.0954 . Bibcode:2007A&A...474..647S. doi:10.1051/0004-6361:20078129. S2CID   73681862.
  4. ↑ Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics. 634: 10. arXiv: 1912.08659 . Bibcode:2020A&A...634A.136C. doi:10.1051/0004-6361/201936523. S2CID   209405391. A136.
  5. ↑ "HD 171028". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-10-06.
  6. ↑ Haywood, M. (May 2008). "A peculiarity of metal-poor stars with planets?". Astronomy and Astrophysics. 482 (2): 673–676. arXiv: 0804.2954 . Bibcode:2008A&A...482..673H. doi:10.1051/0004-6361:20079141. S2CID   16390388.
  7. 1 2 Santos, Nuno C.; et al. (2011), "The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample", Astronomy and Astrophysics, 526: A112, arXiv: 1011.2094 , Bibcode:2011A&A...526A.112S, doi:10.1051/0004-6361/201015494, S2CID   119106340
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