parking orbitAn intermediate, waiting orbit adopted by a spacecraft between two phases of a mission. A launch vehicle boosts into the parking orbit, then coasts for a while, then fires again to enter the final desired trajectory. The alternative to a parking orbit is direct injection, where the rocket fires continuously (except during staging) until its fuel is exhausted, ending with the payload on the final trajectory . Related category• CELESTIAL MECHANICSAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |