WASP-189 b

WASP-189 b (also known as HD 133112 b) is an extrasolar planet that has an orbital period around its host star, WASP-189 (HD 133112), of less than three earth days, and is about 322 light-years away in the Libra constellation.^[1][2][4] It was first discovered in 2018, and was observed in 2020 by CHEOPS.

WASP-189 b

Discovery
Discovery date	2018
Detection method	Transit[1][2]
Orbital characteristics
Semi-major axis	0.05053
Orbital period (sidereal)	2.72 d
Star	WASP-189 (HD 133112)
Physical characteristics
Mean radius	1.600+0.017 −0.016 RJ
Mass	1.99 MJ
Albedo	<0.48[3]
Temperature	3470 K

Discovery and observations

WASP-189 b was first discovered in 2018.^[5] In 2020, astronomers used CHEOPS to observe it. Based on a passage behind its host star (occultation) the planet's brightness could be measured and the temperature was estimated to be 3,200 °C (5,790 °F; 3,470 K). Based on a passage in front of its host star (transit) the radius is 1.6 times the radius of Jupiter.^[1][2][4] Its atmosphere contains titanium oxide, and also contains metals such as chromium, magnesium, vanadium and manganese.^[6]

See also

• Hot Jupiter
• Wide Angle Search for Planets