Which was the First solar probe.
Pioneer 5 Pioneer 5 mounted to its Thor Able launcher. Mission type Interplanetary space research Operator NASA Harvard designation 1960 Alpha 1 COSPAR ID 1960-001A SATCAT no. 27 Spacecraft properties Manufacturer TRW Launch mass 43 kilograms (95 lb) Start of mission Launch date March 11, 1960, 13:00:07 UTC Rocket Thor DM-18 Able IV Launch site Cape Canaveral LC-17A End of mission Last contact April 30, 1960 Orbital parameters Reference system Heliocentric Eccentricity 0.1689 Perihelion 0.7061 astronomical units (105,630,000 km; 65,640,000 mi) Aphelion 0.9931 astronomical units (148,570,000 km; 92,310,000 mi) Inclination 3.35 degrees Period 311.6 days Pioneer 5 (also known as Pioneer P-2, and Thor Able 4, and nicknamed the "Paddle-Wheel Satellite") was a spin-stabilized space probe in the NASA Pioneer program used to investigate interplanetary space between the orbits of Earth...