HD 85628 Ab, also designed MASCARA-4b, is an exoplanet located approximately 559.47±3.05 light years from Earth.
This planet was discovered in 2019 using the transit method.
[1][2] It is a hot Jupiter on a retrograde and slightly eccentric orbit.
[3] The planet is unusually reflective for a hot Jupiter.
[4] Hydrogen, sodium, magnesium, calcium and iron emission from planetary atmosphere was detected.