|HD 18438 b
HD 18438 can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
The red giant is one of the final stages in the evolution of main sequence stars. These stars have already fused most of their hydrogen into helium, and their outer layers are gradually expanding. A white dwarf will form from the dense core of the original star, and the discarded upper layers will become a planetary nebula. In 5 billion years the Sun will also enter the red giant phase. Its size will then inflate to the orbit of Earth or Mars.
Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.