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Class: Earth. Type: Atmosphere. Nation: USA. Agency: U.S. Air Force. 12 foot diameter. balloon; atmospheric density studies. Typical orbit: 757 km x 2433 km at 39 degrees inclination. Mass: 6.50 kg (14.30 lb).
S-56 Chronology - 1960 December 4 - Explorer (9) S 56 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. FAILURE: Second stage malfunction. Mass: 6.00 kg (13.20 lb).
- 1961 February 16 - Explorer 9 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. Mass: 7.00 kg (15.40 lb). Perigee: 757 km (470 mi). Apogee: 2,433 km (1,511 mi). Inclination: 38.80 deg. Period: 118.00 min.
12 foot dia. balloon; atmospheric density studies. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).
Bibliography:- McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: http://www.planet4589.org/jsr.html.
- JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: http://msl.jpl.nasa.gov/home.html.
- Bramscher, Robert G, Spaceflight, "A Survey of Launch Vehicle Failures", 1980, Volume 22, page 351.
- NASA Report, Temperature Control of the Explorer IX Satellite , Web Address when accessed: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19620003946_1962003946.pdf.
- NASA Report, Determination of Mean Atmospheric Densities from the Explorer IX Satellite, Web Address when accessed: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19650018214_1965018214.pdf.
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