RPS-420

Satellite Orbiting Rocket Number 420 (Indonesian: Roket Pengorbit Satelit 420, abbreviated as RPS-420), or Pengorbitan-1, is Indonesia's proposed satellite launching rocket that if successful, will carry Indonesia's first indigenous satellite into Low Earth Orbit in 2014. The aim is to have home-made rockets and satellites. Reaching orbit will make Indonesia a new space power in Asia.

RPS or "Pengorbitan" (Indonesian for "orbital") is ultra-light space launch vehicles subfamily of "RX" (Roket Eksperimental) rockets family. The multistage launchers are being developed by the state company Spacetecx for Indonesia's National Institute of Aeronautics and Space (LAPAN). They will be launched from a mobile pad at Lapan Space Center, where RX-250-LPN mini-rockets have blasted off already.

Currently Indonesian RX rockets has suborbital capabilities only and could serve as a platform for high altitude outer atmosphere studies. Indonesia plans to develop orbital microsatellite launching capabilities with the RPS to launch small satellites into low Earth orbit (LEO). This project was first revealed to the public during the Indo Defence Expo-2008 exhibition in Jakarta.