Events
Of The Day In History
World's 1st Moon Probe, US's Thor-Able,
Explodes At T +77 Sec
17-Aug-16
(AZADI KE PANKH CREATIONS )
17-August-1958
Events Of The Day In History |
The Pioneer 0 (also known as Thor-Able 1)
probe was designed to go into orbit around the Moon and carried a TV camera and
other instruments as part of the first International Geophysical year (IGY)
science payload. It was the first attempt by the USA at a lunar mission, and
the first attempted launch beyond Earth orbit by any country.
It was launched on August 15, 1958 by the
United States Air Force, but the spacecraft was destroyed by an explosion of
the first (Thor booster) stage 77 seconds after launch at 16 km altitude, 16 km
downrange over the Atlantic. Failure was suspected to be due to a ruptured fuel
or oxygen line or a faulty turbopump gearbox. Erratic telemetry signals were
received from the payload and upper stages for 123 seconds after the explosion,
and the upper stages were tracked to impact in the ocean. The original plan was
for the spacecraft to travel for 2.6 days to the Moon at which time a TX-8-6
solid propellant motor would fire to put it into a 29,000 km lunar orbit which
was to nominally last for about two weeks.
Pioneer 0, 1, and 2 were the United States'
first lunar attempts. These identical spacecraft, which all failed to meet
their lunar objectives, were followed by Pioneer 3 and 4, which succeeded in
becoming America's first successful lunar missions.
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