Comet Halley's dust drag perturbing the Giotto spacecraft |
| |
Authors: | Max K Wallis |
| |
Institution: | (1) Department of Applied Mathematics and Astronomy, University College Cardiff, Wales, U.K. |
| |
Abstract: | Hypervelocity impact sputter causes impulses substantially greater than the initial momenta of micro-grains of comet Halley's dust coma, the effective factor being discontinuous at the dust mass (0.2 g) that just penetrates the spacecraft bumper shield. Marginally non-penetrating grains determine the net drag and torque, calculated here for the Giotto shield and exposed components. The torque due to asymmetries induces a precession of the spacecraft axis, whose amplitude is solved for passage through the model dust coma, to find slowly damped oscillations of significant (1°) amplitude. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|