astro.wikisort.org - StarHD 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]
Star in the constellation Ophiuchus
HD 171028
Observation data
Epoch J2000.0 Equinox J2000.0 |
| Constellation |
Ophiuchus |
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| Right ascension |
18h 32m 15.4933s[1] |
| Declination |
06° 56′ 44.6858″[1] |
| Apparent magnitude (V) |
8.301[2] |
| Characteristics |
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| Spectral type |
G0[3] |
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| B−V color index |
0.61[3] |
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| Astrometry |
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| 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) |
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| Details |
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| 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 |
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| Other designations |
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BD+06 3833, TYC 458-1450-1, 2MASS J18321548+0656446[5] |
| Database references |
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| SIMBAD | data |
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 |
1.32 |
550±3 |
0.59±0.01 |
— |
— |
See also
- List of extrasolar planets
References
- 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.
- 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. A99.
- 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.
- 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. A136.
- "HD 171028". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-06.
- 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.
- 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
На других языках
[de] HD 171028
HD 171028 ist ein 293,58 Lichtjahre von der Erde entfernter Gelber Zwerg mit einer Rektaszension von 18h 32m 15s und einer Deklination von +06° 56' 45". Er besitzt eine scheinbare Helligkeit von 8,31 mag. Im Jahre 2007 entdeckte Nuno C. Santos einen extrasolaren Planeten, der diesen Stern umkreist. Dieser trägt den Namen HD 171028 b.
- [en] HD 171028
[ru] HD 171028
HD 171028 — звезда, которая находится в созвездии Змееносец на расстоянии около 293 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.
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