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Aeronomy of Ice in the Mesosphere

Spacecraft
The Aeronomy of Ice in the Mesosphere is a NASA satellite launched in 2007 to conduct a planned 26-month study of noctilucent clouds. It is the ninetieth Explorer program mission and is part of the NASA-funded Small Explorer program. Wikipedia
Launch date: April 25, 2007 at 4:26 PM EDT
Perigee altitude: 552 km (343 mi)
Dimensions: 1.4 × 1.1 m (4 ft 7 in × 3 ft 7 in)
Launch mass: 197 kg (434 lb)
Mission duration: 26 months (planned); 16 years, 11 months and 1 day; (in progress)
Names: Explorer 90; AIM; SMEX