Results 41 to 50 of about 5,627 (172)
Energy Technology, Volume 14, Issue 11, November 2026.A fully sensorless dual‐axis solar tracker based on astronomical ephemerides and postal‐code geographic localization is developed and validated. The proposed discrete tracking strategy increases photovoltaic energy yield while minimizing actuator energy consumption, hardware complexity, and maintenance requirements, providing a practical and cost ...
Khadidja Dahli +4 more
wiley +1 more source
An approximation to the errors in the planetary ephemerides of the Astronomical Almanac
, 2004 Errors in the planetary coordinates of the Astronomical Almanac are approximated by comparing their fundamental ephemerides, upon which they are based, with a more recent ephemeris.
E. M. Standish
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Continuous precise ephemerides for Beidou-2 maneuvered satellites based on a new thrust force model [PDF]
, 2023 Title on author’s file: Continuous Precise Ephemerides for Beidou Maneuvered Satellites Based on a New Thrust Force Model202305 bckwAccepted ManuscriptRGCOthersNational Key Research and Development Program of ChinaPublishedGreen ...
Chen, W, Qiao, J
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A Radio Science Experiment for Dragonfly to Investigate Titan's Rotation and Interior Structure
Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.Abstract NASA's mission Dragonfly to Titan is scheduled for launch in 2028 with arrival in 2034 to study Titan's prebiotic chemistry and habitability. We propose a radio science experiment for Dragonfly, in which radiometric tracking of the rotorcraft from the Deep Space Network, already baselined for communications and navigation, is used as a ...
Flavio Petricca, Dustin Buccino
wiley +1 more source
COMPARISON OF GPS SATELLITE COORDINATES COMPUTED FROM BROADCAST AND IGS FINAL EPHEMERIDES
, 2018 There are mainly two different orbital information, namely broadcast ephemerides and IGS final ephemerides (IGS rapid, ultra rapid, predicted and final ephemerides) used in the GPS positioning. The broadcast ephemerides used in practice and real time are
Ozyuksel, F. +3 more
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Astronomy & AstrophysicsContext. The non-gravitational acceleration (NGA) of comet 67P/Churyumov-Gerasimenko, primarily driven by outgassing, exhibits pronounced anisotropy due to the nucleus’s highly irregular and strongly asymmetric shape.
Yang Wanling +3 more
doaj +1 more source
Quasi‐Homologous Solar Flares and Impacts on Thermospheric Density and Satellite Orbital Drag
Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.Abstract Quasi‐Homologous Flaring (QHF) activity from active regions on the Sun releases intense electromagnetic radiation in recurrent bursts over extended periods. In this letter, we present the effects of recurrent impulsive extreme ultraviolet (EUV) heating on thermospheric neutral density and the resulting atmospheric drag on satellites based on ...
S. Tulasi Ram +8 more
wiley +1 more source
The natural satellites ephemerides facility MULTI-SAT
, 2008 Context. There is a need in some research facilities for deriving ephemerides, controlling observations, verifying various models of motion, and calculating the coordinates in space of natural planetary satellites. Aims. The goal of our work is
Emelyanov, Nikolai V. +3 more
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Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.Abstract In space physics, acronyms for coordinate systems (e.g., GEI, GSM) are commonly used; however, differences in their definitions and implementations can prevent reproducibility. In this work, we compare definitions in online resources, software packages, and frequently cited journal articles and show that implementation differences can lead to ...
R. S. Weigel +8 more
wiley +1 more source
Newtonian Planetary Ephemerides 1800-2000 - Development Ephemeris Number 28 [PDF]
, 1967 Computer-calculated Newtonian ephemerides, 1800-2000, for nine principal planets - Development ephemeris number ...
Lieske, J. H.
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