Pioneer 2
U.S. space probe lost due to a launch failure
Pioneer 2 (also known as Able 3) was the last of the three project Able space probes designed to probe lunar and cislunar space.
Spacecraft design
Pioneer 2 (NSSDCA ID: PION2) was nearly identical to Pioneer 1. It consisted of a thin cylindrical midsection with a squat truncated cone frustum on each side. The cylinder was 74 centimeters (29 in) in diameter and the height from the top of one cone to the top of the opposite cone was 76 centimeters (30 in). Along the axis of the spacecraft and protruding from the end of the lower cone was a 11-kilogram (24 lb) 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. The total mass of the spacecraft after vernier separation but before injection rocket firing was 39.5 kilograms (87 lb).
The scientific instrument package had a mass of 15.6 kg (34.4 lb) and consisted of an STL image-scanning television system (which replaced the NOTS (Naval Ordnance Test Station) image scanning infrared television system on Pioneer 1), a proportional counter for radiation measurements, an ionization chamber to measure radiation in space, a diaphragm/microphone assembly to detect micrometeorites, a spin-coil magnetometer to measure magnetic fields to 5 microgauss, and temperature-variable resistors to record spacecraft internal conditions.
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This entry incorporates text from “Pioneer 2” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.