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Class: Earth. Type: Micrometeoroid. Nation: USA. Agency: NASA.

Micrometeoroid research.

Typical orbit: 444 x 1101 km, 47.2 deg inclinaton.


S-55 Chronology
  • 1961 June 30 - Explorer (13) S 55 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. FAILURE: Third stage did not ignite, and the vehicle was destroyed. Mass: 84 kg (185 lb). Apogee: 172 km (106 mi).
    Micrometeorite counter satellite (S-55).

  • 1961 August 25 - Explorer 13 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. FAILURE: Partial Failure. Mass: 86 kg (189 lb). Perigee: 125 km (77 mi). Apogee: 1,164 km (723 mi). Inclination: 37.70 deg. Period: 97.50 min.
    Useless orbit; micrometeoroid research. Partial Failure.

  • 1962 December 16 - Explorer 16 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. Mass: 100 kg (220 lb). Perigee: 744 km (462 mi). Apogee: 1,159 km (720 mi). Inclination: 52.00 deg. Period: 104.10 min.
    Micrometeoroid data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

  • 1964 November 6 - Explorer 23 - Program: Explorer. Launch Site: Wallops Island. Launch Complex: LA3. Launch Vehicle: Scout. Mass: 134 kg (295 lb). Perigee: 463 km (287 mi). Apogee: 980 km (600 mi). Inclination: 51.90 deg. Period: 99.20 min.
    Micrometeoroid data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).


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