description 55 Cancri Overview
55 Cancri, also designated Rho1 Cancri or HD 75732, is a binary star system in the constellation Cancer located approximately 41 light-years from Earth. The primary star, 55 Cancri A, is a G8V main-sequence star comparable to but slightly smaller and cooler than the Sun, while the secondary, 55 Cancri B, is a red dwarf at a wide projected separation. Five exoplanets are confirmed to orbit the primary component, including the short-period super-Earth 55 Cancri e, which completes an orbit in under 18 hours. The system was among the first to be found hosting at least five planets.
help 55 Cancri FAQ
How many exoplanets orbit the star 55 Cancri?
55 Cancri is a binary star system that hosts five confirmed exoplanets. This makes it one of the few known systems with such a large number of confirmed planets.
Why is the exoplanet 55 Cancri e famous among astronomers?
55 Cancri e is a super-Earth that completes an orbit around its host star in under 18 hours. Because of its incredibly short orbital period and rocky composition, it is often studied as a prime example of a lava world.
How far is the 55 Cancri system from Earth?
The 55 Cancri system is located roughly 41 light-years away from our solar system. It is situated in the northern constellation of Cancer.
What type of stars make up the 55 Cancri binary system?
The primary star, 55 Cancri A, is a yellow dwarf star similar to our own Sun. Its companion, 55 Cancri B, is a smaller, cooler red dwarf star.
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