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Temporal and mean gravity field models derived from the twin-satellite, leader follower mission GRACE have provided a new type of information for Earth sciences.
Highly reduced-dynamic orbits are fitted to the kinematic orbits, where the gravitational accelerations are prescribed by state-of-the-art models (e.g., for the mean gravity field and tides) and the non-gravitational accelerations are coestimated.
Figure 1a presents the GRACE gravity changes calculated by subtracting the mean gravity field over a preearthquake period (February 2008 to February 2011) from the mean field over a postearthquake period (April 2011 to December 2013).
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I don't mean gravity as in seriousness; I mean gravity as in the force that makes things fall downward rather than float upward.
Consequently, CEGM-01 based on six-month tracking data during Chang'E-1 nominal mission phase is presented, and the accuracy of the model is assessed by means of the gravity field power spectrum, admittance and coherence between gravity and topography, lunar surface gravity anomaly and POD for both Chang'E-1 and Lunar Prospector (LP).
It is shown that the global mean error of the lunar gravity field can be reduced to less than 0.1 mGal at a spatial resolution of 50 km.
Thus, they can be used to determine the Earth's gravity field by means of high-low satellite-to-satellite tracking (hl-SST).
An improvement to the Martian gravity field may be achieved by means of future orbiting spacecraft with small eccentricity and low altitude exemplified through a newly proposed mission design that may be tested in upcoming reconnaissance of Mars.
Rosetta, by contrast, will be the first to orbit a comet no mean feat, given 67P's jumpy behavior and irregular gravity field.
By means of a high-precision model of the terrestrial gravity field and the relevant environmental perturbations, we study the evolution of these orbits.
"Operationally, this can mean that planned orbits may be modified, as they assumed a different mass and hence gravity field," explains Taylor.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com