Pioneer 0

Spacecraft design

The spacecraft consisted of a thin cylindrical midsection with a squat truncated cone frustum of 16.5 cm high on each side. The cylinder was 74 cm in diameter and the height from the top of one cone to the top of the opposite cone was 76 cm. Along the axis of the spacecraft and protruding from the end of the lower cone was an 11 kg solid propellant injection rocket and rocket case, which formed the main structural member of the spacecraft. Eight small low-thrust solid propellant velocity adjustment rockets were mounted on the end of the upper cone in a ring assembly which could be jettisoned after use. A magnetic dipole antenna also protruded from the top of the upper cone. The shell was composed of laminated plastic and was painted with a pattern of dark and light stripes to help regulate temperature.[[File:Pioneer - payload configuration for flight 1.png|thumb|Pioneer 0 payload configuration|left]]The scientific instrument package had a mass of 11.3 kg and consisted of:

• An image scanning infrared television system of the Naval Ordnance Test Station (NOTS) design to study the Moon's surface, particularly the part normally unseen from Earth.
• A diaphragm/microphone assembly to detect micrometeorites. A micrometeorite hitting the diaphragm would generate an acoustic pulse that would travel through the diaphragm to the microphone. The microphone contained a piezoelectrical crystal that rang at 100 kc under influence of the acoustic pulse. A bandpass amplifier would amplify the signal, so it could be detected.
• A search-coil magnetometer with nonlinear amplifier to measure the Earth's, Moon's and interplanetary magnetic field. At the time, it was not known whether the Moon had a magnetic field or not.

The spacecraft was powered by nickel-cadmium batteries for ignition of the rockets, silver cell batteries for the television system, and mercury batteries for the remaining circuits. Radio transmission was on 108.06 MHz, a standard frequency used by satellites in the International Geophysical Year, | access-date = 2009-02-17

Launch and failure

Pioneer 0 was launched on Thor missile number 127 at 12:18:00 GMT on 17 August 1958 by the Air Force Ballistic Missile Division, only 4 minutes after the scheduled launch time. It was destroyed by an explosion of the first stage of the Thor booster, 73.6 seconds after lift-off at 15.2 km altitude, 16 km downrange over the Atlantic Ocean. The failure was suspected to be due to a turbopump bearing that came loose, causing the liquid oxygen pump to stop. The abrupt loss of thrust caused the Thor to lose attitude control and pitch downward, which caused the LOX tank to rupture from aerodynamic loads and resulting in complete destruction of the launch vehicle. 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 29000 km lunar orbit which was to nominally last for about two weeks. Air Force officials stated that they were not surprised at the failure, adding that "it would have been more of a shock had the mission succeeded." It was the only mission in the Project Able-1 Probes (USAF) entirely run by the Air Force Ballistic Missile Division, as subsequent missions were conducted by NASA.

References

References

1. (Fall 2004). "The Air Force Ballistic Missile Division and the Pioneer Lunar Probes of 1958". United States Air Force Space Command.
2. "Pioneer 0, 1, 2". [[Jet Propulsion Laboratory]], [[NASA]].
3. Wade, Mark. (2008). "Pioneer 0-1-2". Encyclopedia Astronautica.
4. (1959-02-18). "1958 NASA/USAF Space Probes (ABLE-1) Final Report: Volume 1. Summary". Space Technology Laboratories.
5. (1959-02-18). "1958 NASA/USAF Space Probe (ABLE-1) Final Report: Volume 2. Payload and Experiments". Space Technology Laboratories.
6. (2018). "Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016". NASA History Program Office.