High Performance Green Propulsion (HPGP) is a rocket propellant developed as a safer alternative to hydrazine. HPGP is based on ammonium dinitramide mixed with ammonia and methanol. It can achieve a specific impulse of up to 255 seconds. The Prisma mission served as a demonstrator mission for HPGP. To date, a dozen spacecraft equipment with HPGP thrusters have been launched to space, including the Planet (formerly Skybox Imaging) SkySat spacecraft.
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