HD 154857 b
HD 154857 b is an extrasolar planet approximately 224 light years away in the constellation of Ara. This is a gas giant mass that orbits the star in an eccentric orbit. This planet was detected by using Anglo-Australian Telescope (AAT) UCLE spectrometer.[1][2]
| Discovery | |
|---|---|
| Discovered by | McCarthy et al. AAT .svg.png.webp){kind=small} Australia |
| Discovery site | AAPS |
| Discovery date | 2004 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | 1.8 AU (270,000,000 km) |
| Periastron | 0.64 AU (96,000,000 km) |
| 1.2 ± 0.2 AU (180,000,000 ± 30,000,000 km) | |
| Eccentricity | 0.47±0.02 |
| 409±1 d 1.12 y | |
| 2450346±5 | |
| 59±4 | |
| Semi-amplitude | 50.4±1 |
| Star | HD 154857 |
| Physical characteristics | |
| Mass | >1.8±0.4 MJ (>570±100 M⊕) |
References
- McCarthy, Chris; et al. (2004). "Multiple Companions to HD 154857 and HD 160691". The Astrophysical Journal. 617 (1): 575–579. arXiv:astro-ph/0409335. Bibcode:2004ApJ...617..575M. doi:10.1086/425214.
- O'Toole, Simon J.; et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal. 660 (2): 1636–1641. arXiv:astro-ph/0702213. Bibcode:2007ApJ...660.1636O. doi:10.1086/513563.
External links
- "HD 154857 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-07-21.
- Simulation HD 154857 b
- news.bbc.co.uk
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