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Visual comparison of the sizes of Earth and the Moon (above right) and Pluto–Charon (below right). In astronomy, a double planet (also binary planet) is a binary satellite system where both objects are planets, or planetary-mass objects, and whose barycenter is external to both planetary bodies.
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. ... (similar to the Earth–Moon system ...
The most common kinds of binary system are binary stars and binary asteroids, but brown dwarfs, planets, neutron stars, black holes and galaxies can also form binaries. A multiple system is similar but consists of three or more objects, for example triple stars and triple asteroids (a more common term than 'trinary').
This model is typical of binary stars. Right: Two bodies with a "slight" difference in mass orbiting a common barycenter. Their sizes and this type of orbit are similar to the Pluto–Charon system (in which the barycenter is external to both bodies), as well as the Earth–Moon system (in which the barycenter is internal to the larger body).
HM Cancri (also known as HM Cnc or RX J0806.3+1527) is a binary star system about 1,600 light-years (490 pc; 1.5 × 10 16 km) away. [2] It comprises two dense white dwarfs orbiting each other once every 5.4 minutes, at an estimated distance of only 80,000 kilometres (50,000 miles) apart (about 1/5 the distance between the Earth and the Moon).
The newly-discovered binary star system, which is home to two stars gravitationally bound to one another, was found in a dense stellar cluster orbiting Sagittarius A*, which has an estimated mass ...
The first exoplanet tentatively identified around the second brightest star in the triple star system Alpha Centauri is accordingly called Alpha Centauri Bb. If an exoplanet orbits both of the stars in a binary system, its name can be, for example, Kepler-34(AB) b.
The NASA Exoplanet Archive recognizes Aldebaran as a binary star, with Aldebaran B being the secondary star. [49] A spectral type of M2.5 has been published for Alpha Tauri B. [50] Alpha Tauri CD is a binary system with the C and D component stars gravitationally bound to and co-orbiting each other. These co-orbiting stars have been shown to be ...