Results 21 to 30 of about 10,252 (275)
AGG+, 2021 This paper analyses how broadcast and precise ephemerides in alignment, using the least-squares method, affect the accuracy of coordinates of the newly included permanent stations.
Tanja Đukanović +2 more
doaj +1 more source
CHEOPS observations of the HD 108236 planetary system: a fifth planet, improved ephemerides, and planetary radii [PDF]
Astronomy & Astrophysics, 2021 Context. The detection of a super-Earth and three mini-Neptunes transiting the bright (V = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on the basis of TESS and ground-based light curves. Aims.
A. Bonfanti +108 more
semanticscholar +1 more source
Precise disciplining of a chip-scale atomic clock using PPP with broadcast ephemerides
GPS Solutions, 2023 Over the last decade, chip-scale atomic clocks (CSACs) have emerged as stable time and frequency references with small size, weight, and power (SWaP).
F. Kunzi, O. Montenbruck
semanticscholar +1 more source
The JPL Planetary and Lunar Ephemerides DE440 and DE441
, 2021 The planetary and lunar ephemerides called DE440 and DE441 have been generated by fitting numerically integrated orbits to ground-based and space-based observations. Compared to the previous general-purpose ephemerides DE430, seven years of new data have
R. Park +3 more
semanticscholar +1 more source
V1298 Tau with TESS: Updated Ephemerides, Radii, and Period Constraints from a Second Transit of V1298 Tau e [PDF]
Astrophysical Journal Letters, 2021 V1298 Tau is a young (20–30 Myr) solar-mass K star hosting four transiting exoplanets with sizes between 0.5 and 0.9 R J. Given the system’s youth, it provides a unique opportunity to understand the evolution of planetary radii at different separations ...
A. D. Feinstein +5 more
semanticscholar +1 more source
Commission 4: Ephemerides: (Ephemerides) [PDF]
Transactions of the International Astronomical Union, 1997 During 1994–1996 Ephemerides have been intensively developed for all celestial bodies in the solar system in both analytical and numerical ways, except an analytical ephemeris of Pluto. Because of the shortage of allotted pages this report covers only the reviews of planetary ephemerides.
He Miao-Fu +12 more
openaire +2 more sources
Orbital Elements Ephemerides and Interfaces Design of LEO Satellites [PDF]
Journal of Geodesy and Geoinformation Science, 2019 Low earth orbit satellites, with unique advantages, are prosperous types of navigation augmentation satellites for the GNSS satellites constellations. The broadcast ephemeris element needs to be designed as an important index of the augmented LEOs.
Shanchuan FANG,Lan DU,Yunpeng GAO,Peiyuan ZHOU,Zejun LIU
doaj +1 more source
Precise point positioning with GPS and Galileo broadcast ephemerides
GPS Solutions, 2021 For more than 20 years, precise point positioning (PPP) has been a well-established technique for carrier phase-based navigation. Traditionally, it relies on precise orbit and clock products to achieve accuracies in the order of centimeters.
L. Carlin, A. Hauschild, O. Montenbruck
semanticscholar +1 more source
Astronomical phenomena in Dresden codex [PDF]
Serbian Astronomical Journal, 2013 The relationship between Maya and our calendar is expressed by a coefficient known as ‘correlation’ which is a number of days that we have to add to the Mayan Long Count date to get Julian Date used in astronomy.
Böhm V. +4 more
doaj +1 more source
UTC and GNSS system time access using PPP with broadcast ephemerides
GPS Solutions, 2022 The application of precise point positioning with broadcast ephemerides (PPP-BCE) is discussed as an alternative to the established all-in-view technique for multi-GNSS time transfer.
L. Carlin +3 more
semanticscholar +1 more source