Results 41 to 50 of about 27,204 (304)

Revisiting the 2PN Pericenter Precession in View of Possible Future Measurements

open access: yesUniverse, 2020
At the second post-Newtonian (2PN) order, the secular pericenter precession ω ˙ 2 PN of either a full two-body system made of well-detached non-rotating monopole masses of comparable size and a restricted two-body system composed of a point
Lorenzo Iorio
doaj   +1 more source

Mobile laser scanning elevation data accuracy in closed and partially open sky area

open access: yesGeodesy and Cartography, 2021
Mobile laser scanning is being used more often in Estonia and abroad to obtain geospatial information. As the system is still new and being upgraded, different methods are being used to find out how accurately the mobile laser scanner can measure in ...
Gerly Annok, Valdar Tammin, Natalja Liba
doaj   +1 more source

Under-Developed and Under-Utilized Eclipsing Binary Model Capabilities [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2012
Existing but largely unused binary star model capabilities are examined. An easily implemented scheme is parameterization of starspot growth and decay that can stimulate work on outer convection zones and their dynamos.
R. E. Wilson
doaj   +1 more source

ExoClock project: an open platform for monitoring the ephemerides of Ariel targets with contributions from the public [PDF]

open access: yesExperimental astronomy (Print), 2020
The Ariel mission will observe spectroscopically around 1000 exoplanets to further characterise their atmospheres. For the mission to be as efficient as possible, a good knowledge of the planets’ ephemerides is needed before its launch in 2028.
A. Kokori   +48 more
semanticscholar   +1 more source

Effect of Ephemeris on Pulsar Timing and Navigation Accuracy Based on X-ray Pulsar Navigation-I Data

open access: yesUniverse, 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

A Circular Restricted n-body Problem [PDF]

open access: yesNEGRI, Rodolfo Batista; PRADO, Ant\^onio FBA. Circular Restricted n-Body Problem. Journal of Guidance, Control, and Dynamics, v. 45, n. 7, p. 1357-1364, 2022, 2023
This paper introduces the Circular Restricted n-Body Problem (CRNBP), an extension of the bicircular restricted four-body problem (BCR4BP) designed to describe the dynamics of an n-body system. In the CRNBP, each massive body in the system is constrained to follow a Keplerian motion, similar to the BCR4BP's artificial constraint.
arxiv   +1 more source

Mars moon ephemerides after 14 years of Mars Express data [PDF]

open access: yesAstronomy & 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
semanticscholar   +1 more source

The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261 [PDF]

open access: yesAstronomical 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

Maya records of planetary conjunctions in Dresden Codex [PDF]

open access: yesSerbian Astronomical Journal
Old 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.
doaj   +1 more source

Elemente und Ephemeride [PDF]

open access: yesAstronomische Nachrichten, 1873
n ...
Mölle,, Dunér, R., Henry, Paul
openaire   +3 more sources

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