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LMRSTSat (Low Mass Radio Science Transponder Satellite) is a 3U cubesat by NASA Jet Propulsion Laboratory, Pasadena, California to test out a Low Mass Radio Science Transponder in space to demonstrate the use of X-/Ka-Band ranging techniques to allow further study of Radio Science instruments that can be used for deep-space navigation, gravity field measurements and to examine the motions and cores of celestial bodies once landed.

The Low Mass Radio Science Transponder (LMRST) is a bare-bones, two-way Doppler and ranging transponder, based on well established navigation techniques in use by the Deep Space Network. The proposed LMRST-Sat would be a TRL-raising demonstration mission for a developmental model of the X-Band LMRST exciter. Ka-Band and higher power versions of the instrument are also in development.

In addition to navigation throughout the solar system, LMRST would enable radiometric science such as gravity field determination and planetary atmosphere profiling via radio occultation.

LMRSTSat was originally planned to be a 2U cubesat, but the spacecraft was enlarged during development to the 3U size.

In 2011, LMRSTSat was down-selected for a launch opportunity through the NASA ELaNa program.

Nation: USA
Type / Application: Technology
Operator: Jet Propulsion Laboratory (JPL)
Contractors: Jet Propulsion Laboratory (JPL) (prime); Pumpkin Inc. (bus)
Configuration: CubeSat (3U)
Propulsion: None
Power: Solar cells, batteries
Mass: 5 kg
Satellite COSPAR Date LS Launch Vehicle Remarks
LMRSTSat 2015-058H 08.10.2015 Va SLC-3E Atlas-5(401) with Intruder 11A, Intruder 11B, SNaP-3 ALICE, SNaP-3 EDDIE, SNaP-3 JIMI, SINOD-D 1, SINOD-D 3, AeroCube 5C, OCSD A, ARC 1, BisonSat, Fox 1A, PropCube 1, PropCube 3