Astronomy:HD 154857 b
From HandWiki
Short description: Extrasolar planet orbiting HD 154857
| Discovery | |
|---|---|
| Discovered by | McCarthy et al. AAT  Australia |
| Discovery site | AAPS |
| Discovery date | 2004 |
| Radial velocity | |
| Orbital characteristics | |
| astron|astron|helion}} | 1.8 AU (270,000,000 km) |
| astron|astron|helion}} | 0.64 AU (96,000,000 km) |
| 1.2 ± 0.2 AU (180,000,000 ± 30,000,000 km) | |
| Eccentricity | 0.47±0.02 |
| Orbital period | 409±1 d 1.12 y |
| astron|astron|helion}} | 2450346±5 |
| 59±4 | |
| Semi-amplitude | 50.4±1 |
| Star | HD 154857 |
| Physical characteristics | |
| Mass | >1.8±0.4 |♃|J}}}}}} (>570±100 M⊕) |
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]
References
- ↑ McCarthy, Chris et al. (2004). "Multiple Companions to HD 154857 and HD 160691". The Astrophysical Journal 617 (1): 575–579. doi:10.1086/425214. Bibcode: 2004ApJ...617..575M.
- ↑ O'Toole, Simon J. et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal 660 (2): 1636–1641. doi:10.1086/513563. Bibcode: 2007ApJ...660.1636O.
External links
- "HD 154857 b". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=HD+154857. Retrieved 2008-07-21.
- Simulation HD 154857 b
- news.bbc.co.uk
Coordinates: 
17h 11m 15.7219s, −56° 40′ 50.865″
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