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 mas[1] |
| Distance | 323 ± 9 ly (99 ± 3 pc) |
| Absolute magnitude (MV) | 2.5 ± 0.3[4] |
| Details[4] | |
| Mass | 1.52 ± 0.11 M☉ |
| Radius | 4.1 ± 0.1 R☉ |
| Luminosity | 9.4 ± 0.5 L☉ |
| Temperature | 5030 ± 44 K |
| Metallicity [Fe/H] | 0.04 ± 0.03 dex |
| Age | 2.8 ± 0.7 Gyr years |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
| 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
- ^ a b c d e 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
- ^ 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.
- ^ 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.
- ^ a b c d e f 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.
- ^ "Planet HD 180902 b". exoplanet.eu. Retrieved 2013-06-03.
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