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Earth shadows and the sev angle of map's lissajous orbit at l2
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Edery, Ariel |
| Copyright Year | 2002 |
| Description | The Microwave Anisotropy Probe (MAP) launched successfully on June 30, 2001 and is presently in a Lissajous orbit about the Sun-Earth libration point L2. To avoid Earth shadows at L2, the Sun-Earth-Vehicle (SEV) angle of MAP has to be greater than 0.5 deg for an extended mission of four years. An equation is derived for the SEV angle in terms of the phase angle, frequencies and amplitudes of the Lissajous. The SEV angle is shown to oscillate with a period of 90.4 days within an amplitude envelope of period 13.9 years. A range of phase angles that avoids shadows is identified. MAP'S present phase angle is within this range and will avoid shadows for approximately 5.8 years. |
| File Size | 836545 |
| Page Count | 11 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030020852 |
| Archival Resource Key | ark:/13960/t1tf4rh86 |
| Language | English |
| Publisher Date | 2002-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrodynamics Spacecraft Orbits Phase Shift Lissajous Figures Microwave Anisotropy Probe Libration Earth Planet Shadows Orbital Mechanics Numerical Analysis Stationkeeping Differential Equations Mission Planning Mathematical Models Trajectory Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
