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INstrument for landing-Roving laser Retroreflector Investigations


Mission Name: Chang'e 6


The INstrument for landing-Roving laser Retroreflector Investigations (INRRI) is a collaboration between the Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Frascati (INFN-LNF) and the Chinese Space Agency. INRRI is a small laser retroreflector mounted on the Chang'e 6 lander to reflect laser transmissions sent from orbiting spacecraft back to their source, to determine precise distances between them. The instrument is passive with a mass of about 50 g, and is 20 x 55 mm in size.

Alternate Names

  • Change6/INstrumentforlandingRovinglaserRetroreflectorInvestigations

Facts in Brief

Mass: 0.05 kg

Funding Agency

  • China National Space Administration (Peoples Republic of China)


  • Planetary Science: Geology and Geophysics

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



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