HD 171028

HD 171028 is a yellow main-sequence star in the constellation of Ophiuchus. The apparent magnitude is +8.31, visible in good binoculars. Unlike most planet-harboring stars, it does not have a Hipparcos number, though the distance was estimated at 90±7.8 parsecs. In the summer of 2007, a planet was discovered orbiting this star.[3]

The HD 171028 planetary system[4]

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	—	—

HD 171028

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ophiuchus
Right ascension	18^h 32^m 15.4933^s[1]
Declination	06° 56′ 44.6858″[1]
Apparent magnitude (V)	8.31
Characteristics
Spectral type	G0V
Astrometry
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[1] mas
Distance	365 ± 2 ly (112.0 ± 0.6 pc)
Details
Other designations
BD+06 3833, TYC 458-1450-1, 2MASS J18321548+0656446[2]
Database references
SIMBAD	data

See also

• List of extrasolar planets

References

1. 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. "HD 171028". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-06.
3. 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.
4. Santos, N. 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.