Microgravity experiments; deployed from one shuttle mission, left in earth orbit for extended periods, and retrieved and returned to earth on a later shuttle flight. Frequency plan: 2053.4583/22 30 MHz, 28 GHz/ 18 GHz (data-relay via Olympus).

Typical orbit: 484 km x 509 km at 29 degrees inclination. Mass: 4,491 kg (9,900 lb). Associated Launch Vehicle: Shuttle.

• 1992 July 31 - Eureca-1 - Launch Site: Cape Canaveral. Launch Vehicle: Shuttle. Mass: 4,491 kg (9,900 lb). Perigee: 484 km (300 mi). Apogee: 509 km (316 mi). Inclination: 28.50 deg. Period: 94.60 min.

  Microgravity experiments; deployed from STS-46 8/2/92; retrieved by STS-57; European Retrievable Carrier. EURECA is a European scientific and technology mission, launched by the US Space Transportation System. The spacecraft is scheduled to be retrieved likewise by the US/STS in late spring/early summer 1993. Designator ESA/92/01. Frequency plan: 2053.4583/22 30 MHz, 28 GHz/ 18 GHz (data-relay via Olympus).

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

• 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.

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

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

• McDowell, Jonathan, Launch Log, October 1998. Jonathan McDowell's complete on-line listing of all objects orbited since Sputnik. Accessed at: http://hea-www.harvard.edu/~jcm/space/log/launch.html.