Tested space equipment for future satellites and conducted a scientific experiment to measure the incidence of micro-meteoroids.

Typical orbit: 531 km x 1403 km at 82 degrees inclination. Mass: 66 kg (145 lb). Associated Launch Vehicle: Black Arrow.

• 1970 September 2 - Orba - Launch Site: Woomera. Launch Vehicle: Black Arrow. FAILURE: Second stage shut down 13 seconds early. Apogee: 550 km (340 mi).

  Unsuccessful attempt to orbit a satellite.

• 1971 October 28 - Prospero - Launch Site: Woomera. Launch Vehicle: Black Arrow. Mass: 66 kg (145 lb). Perigee: 531 km (329 mi). Apogee: 1,403 km (871 mi). Inclination: 82.00 deg. Period: 104.40 min.

  To test in space equipment for future satellites and to conduct a scientific experiment to measure the incidence of micro-meteoroids. Launch time 0409 GMT, injection point 13.7 deg S, 137.9 deg E. Anticipated life 100 years.

• McDowell, Jonathan, Jonathan's Space Home Page, Harvard University, 1997-present. Jonathan McDowell's complete on-line listing of all objects orbited and over 20,000 rocket launches Accessed at: http://www.planet4589.org/jsr.html.

• Bramscher, Robert G, Spaceflight, "A Survey of Launch Vehicle Failures", 1980, Volume 22, page 351.

• Krebs, Gunter, Gunter's Space Page, University of Frankfurt, 1996. Accessed at: http://www.skyrocket.de/space.

• USAF Satellite Database, USAF Institute of Technology, 1995. Accessed at: ftp://archive.afit.af.mil/pub/space/.

• JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Accessed at: http://msl.jpl.nasa.gov/home.html.