Trailblazer-1B is prepared for launch, June 4, 1959
Trailblazer 1 (thrust: 365kN/82,055lbf; mass: 3,400kg/7,400lb; height: 17.1 m/56.1ft; diameter: 0.58 m/1.9ft) was first launched on March 3, 1959, and was retired in 1963 (last launch: February 16, 1963). The vehicle had six stages: TX-77, M-6, M5E1, Cygnus 5, T-40, and T-55. Its first three stages took the upper stage package (Cygnus 5, T-40, and T-55 motors) to an apogee, either 260km/162mi or 280km/170mi, when the upper stages fired in unison, pushing the payload (a 13cm sphere) back into Earth's atmosphere at sizable reentry speeds. In each test, a different material was used, and ground workers could observe the spectral density and luminance of the artificial "meteorites" that had been created. On the 1G mission, a more realistic artificial meteorite (a 5.8 g steel bearing) was used as the payload, which was launched into the atmosphere with a reentry speed of 6km/s by a "seventh stage", used after the sixth stage had been depleted. Thus, a reference was provided for the luminance of the trails of the artificial meteorites resulting from later tests.
Trailblazer 2
Trailblazer 2
Trailblazer 2 (thrust: 547kN/122,970lbf; mass: 6,100kg/13,400lb; height: 15.7 m/51.5ft; diameter: 0.79 m/2.59ft) was first launched on December 14, 1961, and was retired in 1973 (last launch: December 6, 1973). Trailblazer 2 sent objects back into the atmosphere much in the same way Trailblazer 1 did, however it was much larger and stronger than Trailblazer 1. Also, due to the sheer size of it, Trailblazer 2 could hold instruments for measuring and sending data to the ground, greatly enhancing its utility to researchers. Trailblazer 2's apogee was around 300km/180mi, and its payload was around 18kg. Its stages were Altair 1, Cygnus 15, TX-77, 1.5KS35000, and Castor 1. Like Trailblazer 1, Trailblazer 2 carried out artificial meteorite experiments. It used 0.7-0.8 g steel balls that were launched at 6.1km/s.
