Results 81 to 90 of about 10,252 (275)
From Lacaille to Lalande. French works on lunar distances, nautical ephemerides and lunar tables, 1742-1785 [PDF]
From R. Dunn, R. Higgitt, 2015, 'Navigational Enterprises in
Europe and its Empires, 1730-1850', Basingstoke, Palgrave/McMillan, 47-64, 2021 The papers studies the highly misknown works of french astronomers on ephemerides and lunar distances on the period 1742-1785. These works will have a strong influence on the development of the Nautical Almanac by Nevil Maskelyne in 1766-1767.
arxiv
Saturn's Small‐Scale Winds Revealed by Its High‐Degree Gravity Field
Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.Abstract During its Grand Finale, the Cassini spacecraft collected crucial gravity data, revealing Saturn's low‐degree gravity harmonics and large‐scale zonal winds extending about 8,000 km deep. However, determining the high‐degree gravity field, essential for understanding small‐scale atmospheric dynamics, is challenging due to the limited spatial ...
S. Kim +4 more
wiley +1 more source
Astrometric observations of Phobos and Deimos during the 1971 opposition of Mars [PDF]
A&A 572, A104 (2014), 2015 Accurate positional measurements of planets and satellites are used to improve our knowledge of their dynamics and to infer the accuracy of planet and satellite ephemerides. In the framework of the FP7 ESPaCE project, we provide the positions of Mars, Phobos, and Deimos taken with the U.S.
arxiv +1 more source
Ecosphere, Volume 16, Issue 3, March 2025.Abstract We stand at the threshold of a transformative era in Earth observation, marked by space‐borne visible‐to‐shortwave infrared (VSWIR) imaging spectrometers that promise consistent global observations of ecosystem function, phenology, and inter‐ and intra‐annual change.
K. Dana Chadwick +112 more
wiley +1 more source
OBSERVATIONS OF THE MUTUAL PHENOMENA OF THE GALILEAN MOONS IN 2009
Odessa Astronomical Publications, 2009 The instrumental and ephemeris preparation for the photometric observations of the mutual phenomena in the system of planetary satellites was conducted within the PHEMU09 project.
N. Koshkin +10 more
doaj +1 more source
Gravity tests with INPOP planetary ephemerides [PDF]
, 2009 In this paper, we present several gravity tests made in using the last INPOP08 planetary ephemerides. We first propose two methods to estimate the PPN parameter $\beta$ and its correlated value, the Sun J2 and we discuss the correlation between the Sun J2 and the mass of the asteroid ring. We estimate possible advance in the planet perihelia.
arxiv +1 more source
Broadband Receiver for VLF On‐Orbit Wave‐Particle Interaction Experiments
Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.Abstract A broadband, multi‐channel Very Low Frequency (VLF) radio receiver (BBR), developed as a sensitive analog, vector wave receiver for whistler‐mode signals in the VLF range, was successfully flown on the Air Force Demonstration Science Experiment (DSX) Mission to Mid‐Earth Orbit (Johnston et al., 2023, https://doi.org/10.1029/2022JA030771).
I. R. Linscott +12 more
wiley +1 more source
S/W Development of High Precesion EPHEMERIS(I) [PDF]
Journal of Astronomy and Space Sciences, 1993 We developed the S/W which calculate the Planetary and the Moon ephemerides. The ephemeris of the Solar system objects was obtained from a simultaneous numerical integration of the equations of motion for the nine planets and the Moon.
Young-Shoek Ahn +4 more
doaj
Spatially Resolved Visible Wavelength Spectroscopy of the Galilean Moons With VLT/MUSE
Journal of Geophysical Research: Planets, Volume 130, Issue 3, March 2025.Abstract We present observations of all four Galilean satellites using spatially resolved visible wavelength (475–935 nm) spectroscopic observations with the ground‐based VLT/MUSE + AOF facility in 2019. A range of features in the observed reflectance spectra were compared to laboratory measured spectra, and mapped to understand the spatial ...
Oliver R. T. King +3 more
wiley +1 more source
Izračun položaja GPS-satelita iz podatkov preciznih efimerid : GPS-orbit computation from precise ephemeris data [PDF]
Geodetski Vestnik, 2005 The article describes the theoretical point of view of the GPS precise ephemerides application that should be used in most precise GPS processing. Regarding broadcast, precise ephemerides allow us to achieve a much better accuracy of the final GPS ...
Bojan Stopar +1 more
doaj