Injun

Class: Earth. Type: Magnetosphere. Nation: USA. Agency: U.S. Air Force, U.S. Navy.

Radiation decay data satellite. May also have been a cover for some NRL ELINT satellites.

Typical orbit: 480 km x 2416 km at 70.3 to 81.4 degrees inclinati. Associated Launch Vehicle: Scout B, Scout X-4, Thor Able-Star, Thor Agena D.

Injun Chronology

1961 June 29 - Injun 1 - Launch Site: Cape Canaveral. Launch Vehicle: Thor Able-Star. Mass: 25 kg (55 lb). Perigee: 869 km (539 mi). Apogee: 992 km (616 mi). Inclination: 66.80 deg. Period: 103.60 min.
Dual launch; failed to separate from Solrad 3; still returned radiation data. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

1962 December 13 - Injun 3 - Launch Site: Vandenberg. Launch Vehicle: Thor Agena D. Mass: 52 kg (114 lb). Perigee: 240 km (140 mi). Apogee: 2,406 km (1,495 mi). Inclination: 70.30 deg. Period: 112.10 min.
Radiation decay data. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

1962 January 24 - Injun 2 - Launch Site: Cape Canaveral. Launch Vehicle: Thor Able-Star. FAILURE: Failure.

1964 November 21 - Explorer 25 - Program: Explorer. Launch Site: Vandenberg. Launch Vehicle: Scout X-4. Mass: 40 kg (88 lb). Perigee: 526 km (326 mi). Apogee: 2,319 km (1,440 mi). Inclination: 81.30 deg. Period: 114.30 min.
Radiation data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

1968 August 8 - Explorer 40 - Program: Explorer. Launch Site: Vandenberg. Launch Vehicle: Scout B. Mass: 70 kg (154 lb). Perigee: 679 km (421 mi). Apogee: 2,489 km (1,546 mi). Inclination: 80.70 deg. Period: 117.80 min.
Injun Explorer; radiation data. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B).

Bibliography and Further Reading

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.

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.

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