First Earth photo; radiation data.

Typical orbit: 245 km x 42400 km at 47 degrees inclination. Mass: 64 kg (141 lb). Associated Launch Vehicle: Thor Able.

• 1959 August 7 - Explorer 6 - Program: Explorer. Launch Site: Cape Canaveral. Launch Vehicle: Thor Able. Mass: 64 kg (141 lb). Perigee: 245 km (152 mi). Apogee: 42,400 km (26,300 mi). Inclination: 47.00 deg. Period: 765.00 min.

  First Earth photo; radiation data.

• 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.

• NASA Report, Scientific Findings from Explorer VI, . Accessed at: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19650012364_1965012364.pdf. -right click to download pdfs!