Concept

ESSA-9

Summary
ESSA-9, also known as TOS-G, was a meteorological satellite. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA). ESSA-9 replaced the ESSA-7 satellite. Launch and orbit ESSA-9 was launched on a three-stage Delta rocket from Cape Canaveral, Florida. The launch occurred at 07:47 UTC (02:47 EDT) on February 26, 1969. The spacecraft was placed in a Sun-synchronous orbit of 101.4° inclination. Immediately after launch ESSA-9 had a perigee of and an apogee of , giving it an orbital period of 115.2 minutes, or a mean motion of 12.5 orbits per day. ESSA-9 operated for 1,726 days before it was deactivated in November 1972. Spacecraft The ESSA-9 spacecraft was similar to the TIROS series of satellites, having an 18-sided polygonal shape that measured in diameter and high. It weighed . The body of ESSA-9 was made of aluminum alloy and stainless steel. The shell of the craft was covered with 10
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