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4. Ephemerides (Ephemerides) [PDF]
Transactions of the International Astronomical Union, 1988 This report covers the period from 1 July 1984 to 30 June 1987. The ephemerides that have been published during this period have made use of the new system of astronomical constants adopted at the XVIth General Assembly of the lAU in Grenoble. Yet some difficulties have arisen because of the lack of catalogues or maps of the heavens established for the
A. Yamazaki +9 more
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An improved method for real-time PPP timing and time transfer with broadcast ephemerides
Measurement science and technology, 2022Due to the problem of network communication, it is difficult to ensure the reliability of real-time precise point positioning (PPP) timing/time transfer with real-time precise products. With the continued reduction in the signal-in-space range error, the
Yulong Ge +5 more
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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
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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
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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 ...
Andrée Deprit-Bartholomé +2 more
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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 ...
Andrée Deprit-Bartholomé +2 more
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Tweeting the cosmos: On the bot poetry of The Ephemerides
Convergence: The International Journal of Research into New Media Technologies, 2020This article discusses Twitter bots that generate textual outputs for aesthetic effect. It considers in-detail a specific instance, The Ephemerides (@the_ephemerides) by Allison Parrish, and presents a critical assessment of how its functional and ...
Richard Carter
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IEEE Aerospace and Electronic Systems Magazine
—Four frameworks for LEO PNT (low Earth orbit positioning, navigation, and timing) with pseudorange or Doppler measurements from non-cooperative satellites with poorly known ephemerides are developed.
Z. M. Kassas, Joe Saroufim
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—Four frameworks for LEO PNT (low Earth orbit positioning, navigation, and timing) with pseudorange or Doppler measurements from non-cooperative satellites with poorly known ephemerides are developed.
Z. M. Kassas, Joe Saroufim
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Physical Ephemerides of the Planets
1994In the previous chapter we have provided the means of accurately calculating the positions of the major planets. Anyone who frequently observes the planets, the Sun, or the Moon, is also interested in data that describe the aspect of the various bodies. The visual magnitude and the apparent angular diameter are data of fundamental importance.
Oliver Montenbruck, Thomas Pfleger
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Precise On-Board Navigation of LEO Satellites with GNSS Broadcast Ephemerides
, 2020The availability of orbit information with high precision and low latency is a key requirement for many Earthobservation missions, predominantly in the field of radio occultation.
A. Hauschild, O. Montenbruck
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Analysis of Phobos’ dynamical environment considering effects of ephemerides and physical libration
, 2020A 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
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Satellite orbits and ephemerides
Celestial Mechanics, 1984This 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.
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