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TRACE

Spacecraft
Transition Region and Coronal Explorer was a NASA heliophysics and solar observatory designed to investigate the connections between fine-scale magnetic fields and the associated plasma structures on ... Wikipedia
Launch date: April 1, 1998 at 9:43 PM EST
Bus: TRACE
Launch mass: 250 kg (550 lb)
Mission duration: 1 year (planned); 12 years, 2 months and 19 days (achieved)
Perigee altitude: 520.0 km (323.1 mi)
Reference system: Geocentric orbit