Topic
Ephemeris
About: Ephemeris is a research topic. Over the lifetime, 2334 publications have been published within this topic receiving 31186 citations. The topic is also known as: ephemerides.
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TL;DR: The first retroreflector array was placed on the moon by Apollo 11, enabling highly accurate measurements of the Earthmoon separation by means of laser ranging as discussed by the authors, which has been used for a broad range of investigations, including astronomy, lunar science, gravitational physics, geodesy, and geodynamics.
Abstract: On 21 July 1969, during the first manned lunar mission, Apollo 11, the first retroreflector array was placed on the moon, enabling highly accurate measurements of the Earthmoon separation by means of laser ranging. Lunar laser ranging (LLR) turns the Earthmoon system into a laboratory for a broad range of investigations, including astronomy, lunar science, gravitational physics, geodesy, and geodynamics. Contributions from LLR include the three-orders-of-magnitude improvement in accuracy in the lunar ephemeris, a several-orders-of-magnitude improvement in the measurement of the variations in the moon's rotation, and the verification of the principle of equivalence for massive bodies with unprecedented accuracy. Lunar laser ranging analysis has provided measurements of the Earth's precession, the moon's tidal acceleration, and lunar rotational dissipation. These scientific results, current technological developments, and prospects for the future are discussed here.
685 citations
TL;DR: In this article, a new solution for the astronomical computation of the orbital motion of the Earth spanning from 0 to −250 Myr is presented, which is valid over more than 50 Myr in the past or into the future with proper phases of the eccentricity variations.
Abstract: We present here a new solution for the astronomical computation of the orbital motion of the Earth spanning from 0 to −250 Myr. The main improvement with respect to our previous numerical solution La2004 is an improved adjustment of the parameters and initial conditions through a fit over 1 Myr to a special version of the highly accurate numerical ephemeris INPOP08 (Integration Numerique Planetaire de l'Observatoire de Paris). The precession equations have also been entirely revised and are no longer averaged over the orbital motion of the Earth and Moon. This new orbital solution is now valid over more than 50 Myr in the past or into the future with proper phases of the eccentricity variations. Owing to the chaotic behavior, the precision of the solution decreases rapidly beyond this time span, and we discuss the behavior of various solutions beyond 50 Myr. For paleoclimate calibrations, we provide several different solutions that are all compatible with the most precise planetary ephemeris. We have thus reached the time where geological data are now required to discriminate between planetary orbital solutions beyond 50 Myr.
662 citations
Book•
15 Aug 2005
TL;DR: The Explanatory Supplement to the Astronomical Almanac as discussed by the authors provides a detailed description of the means of performing practical astronomy or spherical astronomy and is intended to be a reference volume for anybody working with accurate positional astronomical data and anyone interested in investigations of the solar system.
Abstract: The original "Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac" was published in 1961 and revised in 1974. In 1981 the series of publications titled "The Astronomical Ephemeris" and the "American Ephemeris and Nautical Almanac" were continued under the single title "The Astronomical Almanac". Thus, the title of the new edition of the "Explanatory Supplement". In the 1970s it was recognized that there was a need to revise the planetary and lunar ephemerides, the FK4 star catalog, the time scales, the System of Astronomical Constants and the Theory of Nutation. In 1984 all these revisions were introduced using the new standard epoch J2000.0, thus making the original "Explanatory Supplement" out of date. Hence, the new version was prepared based on the FK5 star catalog, the IAU (1976) System of Astronomical Constants, the new time scales, including those adopted in 199 1, the IAU (1980) Theory, of Nutation, and the DE200/LE200 ephemerides. Improvements since 1984 have also been incorporated. Current values of astrometric and planetary data are included. "Explanatory Supplement to the Astronomical Almanac" provides a detailed description of the means of performing practical astronomy or spherical astronomy. It shows how computations for the "Astronomical Almanac" are performed and the underlying information required by someone using that publication or wanting to perform related computations. It is intended to be a reference volume for anybody working with accurate positional astronomical data and anyone interested in investigations of the solar system.
597 citations
TL;DR: The Asteroid Lightcurve Database (LCDB) as mentioned in this paper is a central database for asteroid lightcurve data, i.e., rotation rate and amplitude along with ancillary information such as diameter and albedo, taxonomic class, etc.
529 citations
TL;DR: In this article, a time-harmonic expansion of the gravitational tide potential is computed using an ephemeris of high precision for the Moon and the Sun and the latest I.A.U. astronomical constants.
Abstract: Summary A time-harmonic expansion of the gravitational tide potential is computed using an ephemeris of high precision for the Moon and the Sun and the latest I.A.U. astronomical constants. The results, which are computed for three different epochs and by novel methods, are compared with Doodson's classic expansion. The chief differences are due to secular trends in large terms and to revised constants which reduce all the solar terms. A new expansion is also given for the radiational tide potential.
474 citations