LISA Pathfinder on the way to launch

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The satellite is completed

LISA Pathfinder (LPF), the mission to demonstrate new technologies necessary for the planned gravitational wave observatory eLISA, will be shipped to the spaceport in Kourou on September 3rd, 2015, in preparation for launch. “We have developed completely new technologies to capture the sound of the universe in the future. Now we are eagerly awaiting launch and the first data”, says Prof. Karsten Danzmann, director at the AEI and professor at the Leibniz Universität Hannover . "The LPF mission is going to open for eLISA, a Gravitational-Wave space observatory that will revolutionize many areas of astrophysics, cosmology and fundamental physics", says Dr Carlos F.Sopuerta (Researcher at the Institute of Space Sciences (CSIC-IEEC) in Barcelona)

LISA Pathfinder will test novel technologies in space whose function and performance cannot be tested on the ground at all or only in a limited fashion. LPF will pave the way for the gravitational wave observatory eLISA. Other space missions are already benefiting from the new technologies. One example is the laser ranging interferometer used in the earth observation mission Grace Follow-On, scheduled for launch in 2017.

The Institute of Space Sciences (ICE; CSIC-IEEC), through the group of Gravitational Wave Astronomy-LISA has played an important role in LISA Pathfinder. In collaboration with local industry, the group has designed and built the Data Management Unit (DMU), the computer which controls the experiments on board LISA Pathfinder. The group has also contributed to develop and test the DMU Application Software, and the subsystem diagnostics, a set of highly sensitive sensors for thermal and magnetic control and monitor cosmic radiation of ionized particles. Joint scientific leadership is held by Prof. Karsten Danzmann and Prof. Stefano Vitale from the University of Trento, Italy.

The highly sensitive scientific payload was integrated into the satellite in the last weeks, followed by last function and environment tests. The propulsion module and the launch vehicle adapter were also installed. Now shipment to ESA spaceport Kourou/French Guayana is imminent. From there, the mission will lift off in late autumn on a Vega launcher.

The LPF scientists are now preparing intensively for LPF mission operations. Once LPF has reached its destination, they will extensively test the highly precise technologies on board for a period of several months while maintaining a constant dialogue with the satellite.

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.

The LISA Pathfinder Science Module ontop the propulsion module in their launch setup with thermal isolation prior to acoustic tests at IABG in Ottobrunn, Germany. The acoustic tests in early July 2015 ensured that the spacecraft can withstand the vibrations during the rocket launch. © Airbus DS


Background information

The highly sensitive measurement system of LISA Pathfinder

Two identical cube-shaped test masses weighting 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 millimeter). 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.

For further online information:

Press release about the integration of the highly sensitive LPF science payload into the satellite:

eLISA/LPF website:



Gravitational Wave Astronomy-LISA Group at the Institute of Space Sciences (CSIC-IEEC):


Dr. Carlos F. Sopuerta
Institut de Ciències de l'Espai (CSIC-IEEC)
Campus UAB,
Carrer de Can Magrans s/n
08193 Cerdanyola del Vallès (Barcelona), Spain
Phone: + 34 93 737 9788 (933021)

Dr. Miquel Nofrarias
Institut de Ciències de l'Espai (CSIC-IEEC)
Campus UAB,
Carrer de Can Magrans s/n
08193 Cerdanyola del Vallès (Barcelona), Spain
Phone: + 34 93 737 9788 (933010)



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