HD 180902

HD 180902
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 19m 17.7098s[1]
Declination −23° 33′ 29.360″[1]
Apparent magnitude (V) 7.78[2]
Characteristics
Spectral type K0 III/IV[3]
B−V color index +0.94[4]
Astrometry
Proper motion (μ) RA: 36.232±0.158[1] mas/yr
Dec.: −20.158±0.178[1] mas/yr
Parallax (π)10.11 ± 0.28[1] mas
Distance323 ± 9 ly
(99 ± 3 pc)
Absolute magnitude (MV)2.5 ± 0.3[4]
Details[4]
Mass1.52 ± 0.11 M☉
Radius4.1 ± 0.1 R☉
Luminosity9.4 ± 0.5 L☉
Temperature5030 ± 44 K
Metallicity [Fe/H]0.04 ± 0.03 dex
Age2.8 ± 0.7 Gyr years
Other designations
CD−23° 15276, HD 180902, HIP 94951
Database references
SIMBADdata

HD 180902 is a K-type star HD 180902 approximately 323 light years away in the constellation Sagittarius. It has one planet, HD 180902 b.[4]

Planetary system

HD 180902 b was discovered using the Doppler spectroscopy method with observations taken at the W. M. Keck Observatory.[4] There is also a linear trend in the data indicating an additional companion of unknown nature with a longer period.[4]

The HD 180902 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.6 ± 0.2 MJ 1.39 ± 0.04 479 ± 13 0.09 ± 0.11 — —

References

  1. 1 2 3 4 5 Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry
  2. ↑ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ↑ Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. 4. Bibcode:1988mcts.book.....H.
  4. 1 2 3 4 5 6 Johnson, John Asher; et al. (2010). "Retired a Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory". Publications of the Astronomical Society of the Pacific. 122 (892): 701–711. arXiv:1003.3445. Bibcode:2010PASP..122..701J. doi:10.1086/653809.
  5. ↑ "Planet HD 180902 b". exoplanet.eu. Retrieved 2013-06-03.


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