Explorer 9 - .
Payload: S-56A. Mass: 7.00 kg (15.40 lb). Nation: USA.
Agency: USAF.
Program: Explorer.
Class: Earth.
Type: Atmosphere satellite. Spacecraft: S-56.
Decay Date: 1964-04-09 . USAF Sat Cat: 81 . COSPAR: 1961-Delta-1. Apogee: 2,433 km (1,511 mi). Perigee: 757 km (470 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). .