HD 208487
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h 57m 19.84754s[1] |
| Declination | −37° 45′ 49.0480″[1] |
| Apparent magnitude (V) | 7.47[2] |
| Characteristics | |
| Spectral type | G2V[3] |
| Astrometry | |
| Radial velocity (Rv) | 5.575 ± 0.0004[4] km/s |
| Proper motion (μ) | RA: 101.138[1] mas/yr Dec.: −118.666[1] mas/yr |
| Parallax (π) | 22.1214 ± 0.0773 mas[1] |
| Distance | 147.4 ± 0.5 ly (45.2 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.26[3] |
| Absolute bolometric magnitude (Mbol) | 4.06[3] |
| Details[3] | |
| Mass | 0.95 ± 0.05 M☉ |
| Temperature | 5929 ± 20 K |
| Age | 6.3–10 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 208487 is a 7th-magnitude G-type main-sequence star located approximately 144 light-years away in the constellation of Grus. It has the same spectral type as the Sun—G2V. However, it is probably slightly less massive and more luminous, indicating that it is slightly older. As of 2008, there is one known extrasolar planet confirmed to be orbiting the star.
The star HD 208487 is named Itonda. The name was selected in the NameExoWorlds campaign by Gabon, during the 100th anniversary of the IAU. Itonda, in the Myene tongue, corresponds to all that is beautiful.[6][7]
Planetary system
There is one known planet orbiting the star HD 208487, which is designated HD 208487 b.[3] It has a mass at least half that of Jupiter and is located in an eccentric 130-day orbit.
The discovery of a second planet in the system was announced on 13 September 2005, by P.C. Gregory. The discovery was made using Bayesian analysis of the radial velocity dataset to determine the planetary parameters.[8] However, further analysis revealed that an alternative two-planet solution for the HD 208487 system was possible, with a planet in a 28-day orbit instead of the 908-day orbit postulated, and it was concluded that activity on the star is more likely to be responsible for the residuals to the one-planet solution than the presence of a second planet.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.520 ± 0.082 MJ | 0.51 ± 0.02 | 130.08 ± 0.51 | 0.24 ± 0.16 | — | — |
See also
References
- ^ 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.
- ^ 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.
- ^ a b c d e Tinney, C. G.; et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal. 623 (2): 1171–1179. Bibcode:2005ApJ...623.1171T. CiteSeerX 10.1.1.491.2941. doi:10.1086/428661.
- ^ Soubiran, C.; Jasniewicz, G.; Chemin, L.; Zurbach, C.; Brouillet, N.; Panuzzo, P.; Sartoretti, P.; Katz, D.; Le Campion, J. -F.; Marchal, O.; Hestroffer, D.; Thévenin, F.; Crifo, F.; Udry, S.; Cropper, M.; Seabroke, G.; Viala, Y.; Benson, K.; Blomme, R.; Jean-Antoine, A.; Huckle, H.; Smith, M.; Baker, S. G.; Damerdji, Y.; Dolding, C.; Frémat, Y.; Gosset, E.; Guerrier, A.; Guy, L. P.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics. 616: A7. arXiv:1804.09370. Bibcode:2018A&A...616A...7S. doi:10.1051/0004-6361/201832795. S2CID 52952408.
- ^ "HD 208487". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-06.
- ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- ^ Gregory, P.C. (2007). "A Bayesian Kepler periodogram detects a second planet in HD 208487". MNRAS. 374 (4): 1321–1333. arXiv:astro-ph/0609229. Bibcode:2007MNRAS.374.1321G. doi:10.1111/j.1365-2966.2006.11240.x. S2CID 8220838.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ Wright, J.T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553. S2CID 35682784.
External links
- "Notes for star HD 208487". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-29.
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