Bonn 2010 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 6: Experimente zur Gravitation 2
GR 6.5: Vortrag
Dienstag, 16. März 2010, 15:20–15:40, JUR K
GAP on Odyssey — •Tim van Zoest1, Hansjörg Dittus1, Claus Lämmerzahl2, Hanns Selig2, Bruno Christophe3, and the Odyssey Science Team3 — 1DLR, Inst. f. Raumfahrtsysteme, Bremen — 2ZARM, Universität Bremen — 3ONERA, France
The objective of Odyssey is a set of gravitational tests in the solar system. Specifically, this mission is going to achieve four major scientific objectives, the test of the deep space gravity, the investigation of fly-bys, tests of the general relativity at solar conjunctions and planetary observations at Neptune and Triton. The tests will be performed by the "Gravity Advanced Package" (GAP). Since the instrument is only sensitive to non-gravitational forces, it tells whether or not the spacecraft follows a pure geodesic trajectory. This allows to obtain a much more precise orbit determination trajectory. As a consequence, the dependence of the gravitational force versus the distance to the sun is measured with a largely improved accuracy, opening new perspectives for the test of hypothetical deviations from the 1/r2 law predicted by higher dimensional models with large extra dimensions. During its trip from 1 up to 50 AU, the mission would search for dynamical anomalies in the motion of the spacecraft with an accuracy at the level of 4x10−11 m/s2. The GAP instrument consists of an electrostatic accelerometer (ONERA design) and a bias rejection subsystem, where the rejection is obtained by modulating, at a frequency between 1 and 10 mHz, the non-gravitational acceleration delivered by the accelerometer. The total mass of the instrument is less than 3 kg, with a power consumption less than 3 W and a volume of less than 3 liters.