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Circumplanetary disk
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<p>A circumplanetary disk (or circumplanetary disc, short CPD) is a <a href="/facts/Torus/J9SkaV1W">torus</a>, pancake or ring-shaped accumulation of <a href="/facts/Matter/osyc04UN">matter</a> composed of <a href="/facts/Gas/hVVAoodV">gas</a>, <a href="/facts/Cosmic_dust/Uy6hlL29">dust</a>, <a href="/facts/Planetesimal/PK60dofs">planetesimals</a>, <a href="/facts/Asteroid/g7Ulr1VB">asteroids</a> or collision fragments in <a href="/facts/Orbit/nD2TPySG">orbit</a> around a <a href="/facts/Planet/rbPjE6Bx">planet</a>. They are reservoirs of material out of which <a href="/facts/Natural_satellite/AE4KQKbq">moons</a> (or <a href="/facts/Exomoon/v8ncCW28">exomoons</a> or <a href="/facts/Subsatellite/31waKMUR">subsatellites</a>) may form. Such a disk can manifest itself in various ways. </p><p>In August 2018, astronomers reported the probable detection of a circumplanetary disk around CS Cha B. The authors state that "The CS Cha system is the only system in which a circumplanetary disc is likely present as well as a resolved circumstellar disc." In 2020 though, the parameters of CS Cha B were revised, making it an accreting red dwarf star, and making the disk <a href="/facts/Circumstellar_disk/aEr3EdJF">circumstellar</a>. </p>