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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.
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 ...
Stars with planets are listed in Category:Planetary systems. Binary star systems are listed under the Category:Binary stars . Trinary star systems are listed under Category:Triple star systems , a subcategory of Category:Multiple star systems ; star systems with four or more stars are listed under the subcategory Category:Multiple star systems .
This category is for multiple star systems with confirmed planetary systems, categorized by number of stars. Subcategories This category has the following 4 subcategories, out of 4 total.
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).
Omicron Andromedae is a multiple star containing at least three components. It may consist of two close pairs in a wider orbit, making a four-star system, [14] although the binarity of the primary star is in doubt. [11] This star system has a peculiar velocity of 34.5 ± 5.9 km/s. [14]
Triple stars should be placed under the subcategory Triple stars. If a group of four or more stars are physically close and gravitationally bound, it is a physical multiple star and should be placed under the subcategory Multiple star systems. Multiple stars should be categorized by their number of components.
Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type). Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g., A8, A9, F0, and F1 form a sequence from hotter to cooler).