Public event for LISA Pathfinder launch

Albert Einstein Institute invites media representatives and the general public for a launch event on December 3, 2015

November 20, 2015

On December 3 the LISA Pathfinder mission is launched into space on top of Vega rocket from the European spaceport in Kourou. LISA Pathfinder will demonstrate key technologies for measuring gravitational waves in space and pave the wave for future gravitational-wave detectors such as eLISA. The Albert Einstein Institute in Hannover is one of the leading partners for LISA Pathfinder and eLISA and invites all interested to a launch event in Hannover on the morning of December 3, 2015.

This press release has been updated: Due to technical difficulties with the launcher rocket, the LISA Pathfinder launch was postponed to December 3.


Max Planck Institute for Gravitational Physics (Albert Einstein Institute) and Institute for Gravitational Physics of Leibniz Universität Hannover 
Callinstr. 38 
30167 Hannover


  • doors open at 4:35 CET
  • welcome
  • viewing of (English language) livestream from Kourou spaceport with rocket launch at 5:04 CET
  • short presentation “LISA Pathfinder: erste Schritte zur Gravitationswellemessung im All”
  • breakfast and coffee break
  • optional: tours to the LISA Pathfinder Operations Room at the AEI Hannover
  • exibits about LISA Pathfinder and eLISA
  • viewing of (English language) livestream from the European Space Operations Centre (ESOC) in Darmstadt. At around 7 CET separation of the satellite from the launcher and mission begin; also presentations by LPF scientists (including Dr. Martin Hewitson from AEI Hannover)
  • ends at around 8:20 CET


If your would like to be part of the excitement and watch the LISA Pathfinder launch together with scientists at the Albert Einstein Institute, please send an  to Benjamin Knispel. You may also call +49-(0)511-762-19104 to register.

LISA Pathfinder mission

Once the LPF mission reaches it target in space (1.5 million kilometers from the Earth towards the Sun), it will position, precisely measure and control two test masses in near perfect free fall. This is achieved through state-of-the-art technology comprising inertial sensors, a laser metrology system, a drag-free control system and an ultra-precise micro-propulsion system. All these technologies are crucial for future spaceborne gravitational wave detectors such as eLISA.

The Max Planck Institute for Gravitational Physics (Albert Einstein Institute/AEI) in Hannover played a leading role in the development and construction of the optical scientific instrumentation for LISA Pathfinder. Joint scientific leadership is held by Prof. Karsten Danzmann and Prof. Stefano Vitale from the University of Trento, Italy.

LISA Pathfinder is an ESA mission, with the European space industry under the overall integration responsibility of Airbus DS and research institutions from France, Germany, Italy, the Netherlands, Spain, Switzerland and Great Britain as well as NASA participating.

LISA Pathfinder is funded through the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) by the Federal Ministry for Economic Affairs and Energy based on a resolution of the German Bundestag.

Background information after the page break

Background Information

The highly sensitive measurement system of LISA Pathfinder
Two identical cube-shaped test masses weighing about two kilograms each will be free-floating in their own vacuum canisters for the duration of the mission. They will be almost free of all internal and external disturbances and will thus allow the demonstration of the precise measurement of free-falling masses in space. A special gold-platinum alloy has been used for the masses to eliminate any influence from magnetic forces. Using ultraviolet radiation, a contact-free discharge system prevents electrostatic charge build-up on the test masses. The caging and grabbing mechanism – responsible for protecting the test masses from intense vibrations during launch, releasing them in a highly controlled setting, and capturing them as necessary – is a particular challenge in this context. A laser interferometer will measure the position and orientation of the two test masses relative to the spacecraft and to each other with a precision of approximately 10 picometers (one hundred millionth of a millimetre). In addition, there are less precise capacitive inertial sensors that also help determine their positions. The positional data is used by a Drag-Free Attitude Control System (DFACS) to control the spacecraft and ensure it always remains centered on one test mass. The actual position of the satellite is controlled through cold gas micronewton thrusters, which have the capability of delivering propulsion in extremely fine and uniform amounts. The thrust generated is in the micronewton range – this equates to the weight of a grain of sand on Earth.

Paving the way for new astronomy
LISA Pathfinder paves the way for eLISA, a large space observatory for the direct observation of one of the most elusive astronomical phenomena – gravitational waves. These tiny distortions of space-time were predicted by Albert Einstein and their observation requires an extremely sensitive and highly precise measurement technology. Space observatories like eLISA will measure gravitational waves in the millihertz range. They will complement ground-based detectors such as GEO600, aLIGO, and Virgo, which observe at higher frequencies in the audio range. Gravitational wave observatories will probe unknown domains – the “dark side of the universe” – in concert with other astronomical methods. One example is the formation, growth and merger of massive black holes. It will also be possible to further test Einstein’s Theory of General Relativity and search for unknown physics.

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