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A multiple star system consists of two or more stars that appear from Earth to be close to one another in the sky. [dubious – discuss] This may result from the stars actually being physically close and gravitationally bound to each other, in which case it is a physical multiple star, or this closeness may be merely apparent, in which case it is an optical multiple star [a] Physical multiple ...
Apart from the Sun and stars which act as gravitational lenses, this can be done only in binary and multiple star systems, making the binary stars an important class of stars. In the case of a visual binary star, after the orbit and the stellar parallax of the system has been determined, the combined mass of the two stars may be obtained by a ...
This category is for physical multiple stars, i.e., small groups of three or more close stars gravitationally bound to each other. Optical companions (stars that appear to be close together but are physically unrelated) do not count. Star systems placed here should be categorized by their number of components.
Its primary is a B-type main-sequence star, and the secondary an A-type main-sequence star. The secondary star may be an Am star. [4] Farther out are two other stars, designated components C and D. They are 76.1″, or about 1.27′, away from the central system. [9] Their combined spectrum matches that of another B-type main-sequence star. [6]
The stars with the most confirmed planets are the Sun (the Solar System's star) and Kepler-90, with 8 confirmed planets each, followed by TRAPPIST-1 with 7 planets. The 1,033 multiplanetary systems are listed below according to the star's distance from Earth. Proxima Centauri, the closest star to the Solar System, has three planets (b, c and d).
The component stars of ε 1 have magnitudes of 4.7 and 6.2 separated by 2.6" and have an orbital period that can only be crudely estimated at 1200 years, which places them at roughly 140 AU apart. Main components of ε 2 have magnitudes 5.1 and 5.5 separated by 2.3", and orbit in perhaps half that period. ε 1 and ε 2 are more than 0.16 light ...
Regulus is the brightest star in the constellation of Leo (right tip, below is bright Jupiter in 2004). Regulus is a multiple star system consisting of at least four stars. Regulus A is the dominant star, with a binary companion 177" distant that is thought to be physically related.
The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [22] It approved the name Dalim for the component Alpha Fornacis A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. [13]