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- Zero-drag_satellite abstract "Zero-drag satellites or equivalently "drag-free satellites" are satellites where the payload follows a geodesic path through space only affected by gravity and not by non-gravitational forces such as drag of the residual atmosphere, light pressure and solar wind. A zero-drag satellite has two parts, an outer shell and an inner mass called the proof mass. The proof mass, containing the payload, is floating freely inside the outer shell. The distance between the outer shell and the proof mass is constantly measured. When a change in the distance between the outer shell and the proof mass is detected, it means that the outer shell has been influenced by non-gravitational forces and moved relative to the proof mass. Thrusters on the outer shell will then reposition the outer shell relative to the proof mass so that its distance is the same as before the external influence changed it. The outer shell thus protects the proof mass from nearly all interactions with the outside that can cause acceleration, except those mediated by gravity.One way to think about a zero-drag satellite is to see the shell/proof mass setup as being an accelerometer, measuring the acceleration of the outer shell. The input from the accelerometer is then used to control the satellites thruster to exactly compensate for the measured acceleration, ensuring that over time the satellite has zero acceleration. Since the proof mass is floating free within the outer shell, neither the initial drag nor the thruster's compensation for it is experienced by the proof mass.Zero-drag satellites are used in situations where it is instrumental for the satellite's mission that the payload remains on a near perfect geodesic path. Two such missions are the LISA gravitational wave observatory and the ESA GOCE spacecraft that measures variations in the Earth's gravitational field.".
- Zero-drag_satellite wikiPageExternalLink Lange_AIAA-55086-337.pdf.
- Zero-drag_satellite wikiPageExternalLink news56324.html.
- Zero-drag_satellite wikiPageID "26275231".
- Zero-drag_satellite wikiPageRevisionID "603512101".
- Zero-drag_satellite cleanup "February 2010".
- Zero-drag_satellite hasPhotoCollection Zero-drag_satellite.
- Zero-drag_satellite refimprove "February 2010".
- Zero-drag_satellite subject Category:Satellites.
- Zero-drag_satellite type Artifact100021939.
- Zero-drag_satellite type Equipment103294048.
- Zero-drag_satellite type Instrumentality103575240.
- Zero-drag_satellite type Object100002684.
- Zero-drag_satellite type PhysicalEntity100001930.
- Zero-drag_satellite type Satellite104137444.
- Zero-drag_satellite type Satellites.
- Zero-drag_satellite type Whole100003553.
- Zero-drag_satellite comment "Zero-drag satellites or equivalently "drag-free satellites" are satellites where the payload follows a geodesic path through space only affected by gravity and not by non-gravitational forces such as drag of the residual atmosphere, light pressure and solar wind. A zero-drag satellite has two parts, an outer shell and an inner mass called the proof mass. The proof mass, containing the payload, is floating freely inside the outer shell.".
- Zero-drag_satellite label "Zero-drag satellite".
- Zero-drag_satellite sameAs m.0b76fz0.
- Zero-drag_satellite sameAs Q8069443.
- Zero-drag_satellite sameAs Q8069443.
- Zero-drag_satellite sameAs Zero-drag_satellite.
- Zero-drag_satellite wasDerivedFrom Zero-drag_satellite?oldid=603512101.
- Zero-drag_satellite isPrimaryTopicOf Zero-drag_satellite.