Space physics coordinate transformations: the role of precession
Raw data on spacecraft orbits and attitude are usually supplied in "inertial" coordinates. The normal geocentric inertial coordinate system changes slowly in time owing to the effects of astronomical precession and the nutation of the Earth's rotation axis. However...
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doaj-add30a84117a434897dfe3f8056680fc2020-11-25T01:28:30ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-0576137713716Space physics coordinate transformations: the role of precessionM. A. HapgoodRaw data on spacecraft orbits and attitude are usually supplied in "inertial" coordinates. The normal geocentric inertial coordinate system changes slowly in time owing to the effects of astronomical precession and the nutation of the Earth's rotation axis. However, only precession produces a change that is significant compared with the errors in determining spacecraft position. We show that the transformations specified by Russell (1971) and Hapgood (1992) are strictly correct only if the epoch-of-date inertial system is used. We provide a simple formula for estimating the error in the calculated position if the inertial system for some other epoch is used. We also provide a formula for correcting inertial coordinates to the epoch-of-date from the standard fixed epoch of J2000.0. http://www.ann-geophys.net/13/713/1995/angeo-13-713-1995.html |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. A. Hapgood |
spellingShingle |
M. A. Hapgood Space physics coordinate transformations: the role of precession Annales Geophysicae |
author_facet |
M. A. Hapgood |
author_sort |
M. A. Hapgood |
title |
Space physics coordinate transformations: the role of precession |
title_short |
Space physics coordinate transformations: the role of precession |
title_full |
Space physics coordinate transformations: the role of precession |
title_fullStr |
Space physics coordinate transformations: the role of precession |
title_full_unstemmed |
Space physics coordinate transformations: the role of precession |
title_sort |
space physics coordinate transformations: the role of precession |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
description |
Raw data on spacecraft orbits and attitude are usually supplied in "inertial" coordinates. The normal geocentric inertial coordinate system changes slowly in time owing to the effects of astronomical precession and the nutation of the Earth's rotation axis. However, only precession produces a change that is significant compared with the errors in determining spacecraft position. We show that the transformations specified by Russell (1971) and Hapgood (1992) are strictly correct only if the epoch-of-date inertial system is used. We provide a simple formula for estimating the error in the calculated position if the inertial system for some other epoch is used. We also provide a formula for correcting inertial coordinates to the epoch-of-date from the standard fixed epoch of J2000.0. |
url |
http://www.ann-geophys.net/13/713/1995/angeo-13-713-1995.html |
work_keys_str_mv |
AT mahapgood spacephysicscoordinatetransformationstheroleofprecession |
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1725101285678514176 |