HD 154857 b

HD 154857 b

Discovery
Discovered by	McCarthy et al. AAT  Australia
Discovery site	AAPS
Discovery date	2004
Detection method	Radial velocity
Orbital characteristics
Apastron	1.8 AU (270,000,000 km)
Periastron	0.64 AU (96,000,000 km)
Semi-major axis	1.2 ± 0.2 AU (180,000,000 ± 30,000,000 km)
Eccentricity	0.47±0.02
Orbital period (sidereal)	409±1 d 1.12 y
Time of periastron	2450346±5
Argument of periastron	59±4
Semi-amplitude	50.4±1
Star	HD 154857
Physical characteristics
Mass	>1.8±0.4 MJ (>570±100 ME)

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]

• "HD 154857 b". Extrasolar Planets Encyclopaedia. Archived from the original on July 2, 2007. Retrieved 2008-07-21.
• Simulation HD 154857 b
• news.bbc.co.uk

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