Results 171 to 180 of about 6,726 (227)

Analysis of Phobos’ dynamical environment considering effects of ephemerides and physical libration

, 2020
A dynamical model is developed in the body-fixed frame of Phobos, in which the high-precision gravity field and exact physical libration of Phobos, the gravity of Mars with J2, and the gravity perturbations of the Sun, Jupiter, and Earth are considered.
Yue Wang, Xiaojie Wu
semanticscholar   +1 more source

Compression of ephemerides

Celestial Mechanics, 1975
An algorithm is proposed for generating sequences of Chebyshev series which are the best approximations of an astronomical ephemeris in the sense of Chebyshev over large intervals of time. The criterion for a polynomial approximation of a function to be the best polynomial approximation of the function is that the error function present certain ...
Andr� Deprit, Walter Poplarchek, Andr�e Deprit-Bartholom�   +2 more
openaire   +1 more source

Ephemerides in chebyshev series

Mechanics Research Communications, 1974
In c e l e s t i a l m e c h a n i c s one c a l l s t h e o r y a d i c t i o n a r y o f f o r mulas t o r e p r e s e n t a p p r o x i m a t e l y a c l a s s o f s o l u t i o n s to v a r i a n t s o f t h e p r o b l e m o f n b o d i e s . The l i t e r a l s e r i e s a r e e v a l u a t e d a t e q u i d i s t a n t t i m e s , and t h e r e ...
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Satellite orbits and ephemerides

Celestial Mechanics, 1984
This review considers theoretical work leading to the actual knowledge of the motions of all planetary satellites, except the Moon. It covers recent calculations of inequalities of satellites’ motions and the determination of their orbits on the basis of existing observational data.
openaire   +1 more source

Re-reduction of CCD astrometric observations of Neptunian satellites in 2006–2007 based on Gaia DR2 and comparison with ephemerides

Planetary and Space Science, 2019
Based on the newly released Gaia DR2 star catalogue, the CCD images of Neptunian satellites taken by the telescopes at Xinglong Observatory of National Astronomical Observatory in 2006–2007 were re-reduced. A total of 174 satellite positions were derived,
Yan Yu, X. Cheng, R. Qiao, D. Yan, H. Luo, K. Tang   +5 more
semanticscholar   +1 more source

Planetary Ephemerides

International Astronomical Union Colloquium, 1980
AbstractIn the past twenty years there has been a great amount of growth in radiometric observing methods, as well as in classical optical observations. Through radar ranging and Doppler observations of the planets and spacecraft, we have been able to improve our knowledge of the location and motion of the planets by several orders of magnitude and ...
Jay H. Lieske, E. Myles Standish
openaire   +1 more source

On the Implementation of Information Technology for Refining the Ephemerides of GLONASS Spacecraft Based on the Use of Advanced Intersatellite Measurement Hardware

Journal of computer & systems sciences international, 2023
M. N. Krasil’schikov, D. Kruzhkov, V. Pasynkov   +2 more
semanticscholar   +1 more source

BDS-3 and GPS/Galileo integrated PPP using broadcast ephemerides

GPS Solutions, 2022
Guo Chen, N. Wei, Min Li, Qile Zhao, Jiangnan Zhang   +4 more
semanticscholar   +1 more source

Ephemerides of the Planets

1995
Our material contains ephemerides for all five planets.The distribution is very uneven: 41 texts and fragments for Jupiter, but only 12 for Saturn, 11 for Mercury, 9 for Venus, and 8 for Mars.
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Ephemerides

Moreana, 1966
Edgar W. Woolard, Gerald M. Clemence
openaire   +2 more sources