madâr-e dâyere-yi, ~ parhuni
Fr.: orbite circulaire
The path of a object in → circular motion.
innermost stable circular orbit (ISCO)
darunitarin madâr-e dâyere-yi-ye pâydâr
Fr.: orbite circulaire stable intérieur
The smallest → circular orbit in which a particle can stably orbit a → black hole according to → general relativity without the risk of falling past the → event horizon. In other words, the ISCO is the inner edge of the → accretion disk around a black hole. Therefore, characteristics of accretion disks depend on ISCO. The radius of ISCO is calculated to be three times the → Schwarzschild radius (3 RSch). ISCO is closer to event horizon for rotating black hole.