Astronomy:HD 203473 b

Short description: Exoplanet orbiting HD 203473 b

HD 203473 b

An artist's impression of HD 203473 b orbiting its host star.
Discovery
Discovered by	Ment et al.
Discovery site	W.M. Keck Observatory in Hawaii
Discovery date	2018
Detection method	Doppler spectroscopy
Orbital characteristics
|{{{apsis}}}|helion}}	3.52 AU (527,000,000 km)
|{{{apsis}}}|helion}}	1.94 AU (290,000,000 km)
Semi-major axis	2.73 ± 0.17 AU (408,000,000 ± 25,000,000 km)
Eccentricity	0.29±0.01
Orbital period	1,553±3 d
|{{{apsis}}}|helion}}	2,463,333.6±9.1 JD
|{{{apsis}}}|helion}}	18.0°±1.1°
Semi-amplitude	134±2 km/s
Physical characteristics
Mass	≥7.8±1.1 Jupiter mass
Physics	137.3 K (−212.5 °F; −135.8 °C)

HD 203473 b is an exoplanet orbiting the G-type main sequence star HD 203473 approximately 237 light years in the constellation Equuleus.

Discovery

The planet, along with others were discovered by scientist at the W.M. Keck Observatory in 2018 using Doppler spectroscopy. The paper states that the planets observed are "cold Jupiters", which orbit far away from their hosts.

Properties

Since the planet was detected with radial velocity, properties such as its inclination, radius, density, and volume are unknown. HD 203473 b takes about 4 years to orbit its host star at a separation of 2.73 AU. Like most long-period planets, HD 203473 has an eccentric orbit, carrying it as far as 3.52 AU, and close as 1.94. Assuming from its high mass, HD 203473 is certainly a gas giant with no solid surface.

See also

• List of largest exoplanets
• List of nearest exoplanets
• List of potentially habitable exoplanets