HD 171028

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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) 8.31
Spectral type G0V
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
Distance365 ± 2 ly
(112.0 ± 0.6 pc)
Other designations
BD+06 3833, TYC 458-1450-1, 2MASS J18321548+0656446[2]
Database references

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]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥1.98 MJ 1.32 550±3 0.59±0.01

See also[edit]


  1. ^ a b c d e 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.

Coordinates: Sky map 18h 32m 15.4929s, +06° 56′ 44.714″