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Mission goal Mars
Client AMSAT
Takeoff mass 650 kg
Course of the mission
Project is launched
2015 Aborted mission

P5A was a planned Amateur Radio - Mars probe . It was the technically most demanding project of the amateur radio satellite association AMSAT to date . The abbreviation P5A stands for the first project in the “Phase 5” category, which describes missiles that leave the earth's gravitational field. The project was canceled in 2015.

P5A was to have the same structure and propulsion system as the OSCAR 40 (P3D) satellite launched in 2000 . In addition, a balloon called Archimedes was supposed to be released and land on the surface of Mars. The balloon was built by the Mars Society . Part of the P5A payload was to be tested beforehand on the P3E amateur radio satellite , for which a potential launch opportunity was found in July 2015.

In September 2012 it became known that the German Aerospace Center (DLR) will no longer support the P5A mission and the University of Marburg is withdrawing from the central development laboratory, making the future of the project uncertain.


  • Karl Meinzer: Communication over interstellar distances . Part I and II. In: AMSAT-DL . No. 3 , 2005, p. 4–10 ( amsat-dl.org ( memento of December 12, 2013 in the Internet Archive ) [PDF; 781 kB ; accessed on July 27, 2015]).
  • Lukas Emele: Design of the antennas for the Mars spacecraft P5A for the S and X bands . Thesis. Constance August 22, 2005 ( htwg-konstanz.de [PDF; 171 kB ; accessed on April 5, 2015]).
  • Archimedes concept and background. Mars Society Germany e. V., accessed December 21, 2012 .

Web links

Individual evidence

  1. AMSAT P5A (Phase 5A, Go-Mars) at Gunter's Space Page (English).
  2. Peter Gülzow, Hartmut Päsler, Michael R. Lengrüsser: DLR's rejection of the DLR / P5 or Mascot 2 project . ( Memento of December 12, 2013 in the Internet Archive ) amsat-dl.org, September 14, 2012 (German, English); Retrieved December 8, 2013