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| Titel |
Modelling of spacecraft spin period during eclipse |
| VerfasserIn |
E. Georgescu, F. Plaschke, U. Auster, K.-H. Fornacon, H. U. Frey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 5 ; Nr. 29, no. 5 (2011-05-19), S.875-882 |
| Datensatznummer |
250017021
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| Publikation (Nr.) |
 copernicus.org/angeo-29-875-2011.pdf |
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| Zusammenfassung |
| The majority of scientific satellites investigating the Earth magnetosphere
are spin stabilized. The attitude information comes usually from a sun
sensor and is missing in the umbra; hence, the accurate experimental
determination of vector quantities is not possible during eclipses. The spin
period of the spacecraft is generally not constant during these times
because the moment of inertia changes due to heat dissipation. The
temperature dependence of the moment of inertia for each spacecraft has a
specific signature determined by its design and distribution of mass. We
developed an "eclipse-spin" model for the spacecraft spin period behaviour
using magnetic field vector measurements close to the Earth, where the
magnetic field is dominated by the dipole field, and in the magnetospheric
lobes, where the magnetic field direction is mostly constant. The modelled
spin periods give us extraordinarily good results with accumulated phase
deviations over one hour of less than 10 degrees. Using the eclipse spin
model satellite experiments depending on correct spin phase information can
deliver science data even during eclipses. Two applications for THEMIS B,
one in the lobe and the other in the lunar wake, are presented. |
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