About this world
MASCARA-4 b is a gas giant orbiting MASCARA-4, a white A-type star (type A7V) 557 light-years from Earth. It is about 1.5 times the size of Jupiter and holds 1.7 Jupiter masses. It completes an orbit every 2.82 days at 0.047 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 2,250 K (1,977 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2020 by transit with Multiple Observatories. A planet crosses its star and dims it by a tiny, periodic fraction.