Results 41 to 50 of about 6,726 (227)
Mars moon ephemerides after 14 years of Mars Express data [PDF]
Astronomy & Astrophysics, 2020 The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos.
V. Lainey +9 more
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The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261 [PDF]
Astronomical Journal, 2020 Although the Transiting Exoplanet Survey Satellite (TESS) primary mission observed the northern and southern ecliptic hemispheres, generally avoiding the ecliptic, and the Kepler space telescope during the K2 mission could only observe near the ecliptic,
M. Ikwut-Ukwa +32 more
semanticscholar +1 more source
Transactions of the International Astronomical Union, 1982 The period of this Report includes 1984 January 1, the date which was probably the most drastic caesura in the history of astronomical almanacs. It seemed, therefore, appropriate to concentrate here to the general aspects rather than to describe the works going on at the particular almanac offices.
A M Sinzi +10 more
openaire +2 more sources
Ephemerides of the Irregular Saturnian Satellites from Earth-based Astrometry and Cassini Imaging
Astronomical Journal, 2022 We report a new determination of the orbits of the irregular Saturnian satellites. We fit their numerically integrated orbits to a data set containing Earth-based observations and imaging data from the Cassini spacecraft. We include the statistics of the
R. Jacobson +4 more
semanticscholar +1 more source
Effect of Ephemeris on Pulsar Timing and Navigation Accuracy Based on X-ray Pulsar Navigation-I Data
Universe, 2022 Solar system ephemeris is very important for pulsar timing and navigation. In order to explore the effect of different precision ephemerides on X-ray pulsar timing and navigation, the differences between timing and navigation results with four JPL ...
Yongtao Deng, Shuanggen Jin
doaj +1 more source
Izračun položaja GPS-satelita iz podatkov oddanih efemerid : GPS-Orbit Computation from Broadcast Ephemeris Data [PDF]
Geodetski Vestnik, 2004 The article describes the theoretical point of view of the GPS-broadcast ephemerides application. Beside the raw GPS observations, any kind of GPS ephemerides represents indispensable data in the GPS processing engine.
Bojan Stopar +1 more
doaj
Maya records of planetary conjunctions in Dresden Codex [PDF]
Serbian Astronomical JournalOld Mayas designed a very complicated calendar, and they also recorded important historical events and astronomical phenomena. Dresden Codex (DC), one of the four preserved Mayan hieroglyphic literal legacies, contains many of these, covering ...
Vondrák J., Böhm V., Böhm B.
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Remote Sensing, 2021 Positioning accuracy is affected by the combined effect of user range errors and the geometric distribution of satellites. Dilution of precision (DOP) is defined as the geometric strength of visible satellites.
Haomeng Cui, Shoujian Zhang
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Frontiers in Astronomy and Space SciencesPrecise orbit determination of main-belt asteroids is essential for deep-space mission design, navigation, and target characterization. This study presents a refined orbit-determination analysis for 623 Chimaera and 269 Justitia, the two largest targets ...
Runsong Lu +8 more
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