Helios
Spacecraft
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Helios-A and Helios-B are a pair of probes that were launched into heliocentric orbit to study solar processes. As a joint venture between German Aerospace Center and NASA, the probes were launched from Cape Canaveral Air Force Station, Florida,... Wikipedia
Rocket: Titan IIIE / Centaur
Aphelion altitude: Helios-A: 0.99 AU; Helios-B: 0.98 AU
Entered service: Helios-A: January 16, 1975; Helios-B: July 21, 1976
Last contact: Helios-A: February 10, 1986; Helios-B: March 3, 1980
Launch date: Helios-A: December 10, 1974, 07:11:01 UTC; Helios-B: January 15, 1976, 05:34:00 UTC
Launch mass: Helios-A: 371.2 kg (818 lb); Helios-B: 374 kg (825 lb)
Mission duration: Helios-A: 10 years, 1 month, 2 days; Helios-B: 3 years, 5 months, 2 days