Results 31 to 40 of about 27,204 (304)

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. Feinstein, T. David, B. Montet, D. Foreman-Mackey, J. Livingston, A. Mann   +5 more
semanticscholar   +1 more source

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

4. Ephemerides [PDF]

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, T Lederle, V K Abalakin, S Aoki, R L Duncombe, J H Lieske, B L Morando, A Orte, P K Seidelmann, G A Wilkins, B D Yallop   +10 more
openaire   +2 more sources

Precise real‐time navigation of LEO satellites using GNSS broadcast ephemerides

Navigation, 2021
The availability of orbit information with high precision and low latency is a key requirement for many Earth-observation missions, predominantly in the field of radio occultation.
A. Hauschild, O. Montenbruck
semanticscholar   +1 more source

Planetary Ephemerides [PDF]

Highlights of Astronomy, 1974
At the present time the planetary ephemerides in the Astronomical Ephemeris and in the American Ephemeris and Nautical Almanac (both hereinafter referred to as the AE), the Astronomical Ephemeris of the U.S.S.R. and most other national almanacs have the following basis: For Mercury, Venus, Earth, and Mars the general theories of Simon Newcomb (1898a ...
R. L. Duncombe, P. K. Seidelmann, P. M. Janiczek   +2 more
openaire   +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, O. Montenbruck, J. Furthner, A. Hauschild   +3 more
semanticscholar   +1 more source

Modeling the Uncertainties of Solar System Ephemerides for Robust Gravitational-wave Searches with Pulsar-timing Arrays [PDF]

Astrophysical Journal, 2020
The regularity of pulsar emissions becomes apparent once we reference the pulses’ times of arrivals to the inertial rest frame of the solar system.
M. Vallisneri, Stephen R. Taylor, Stephen R. Taylor, J. Simon, W. Folkner, Ryan S. Park, Curt Cutler, Justin A. Ellis, T. Lazio, S. Vigeland, K. Aggarwal, Z. Arzoumanian, P. T. Baker, P. T. Baker, A. Brazier, P. Brook, S. Burke-Spolaor, S. Chatterjee, J. Cordes, N. Cornish, F. Crawford, H. Cromartie, K. Crowter, M. DeCesar, P. Demorest, T. Dolch, R. Ferdman, E. Ferrara, E. Fonseca, N. Garver-Daniels, P. Gentile, D. Good, J. Hazboun, A. M. Holgado, E. Huerta, K. Islo, R. Jennings, G. Jones, Megan L. Jones, David L. Kaplan, L. Z. Kelley, J. Key, M. Lam, L. Levin, D. Lorimer, Jing Luo, R. Lynch, D. Madison, M. McLaughlin, S. McWilliams, C. Mingarelli, C. Ng, D. Nice, T. Pennucci, N. Pol, S. Ransom, S. Ransom, P. Ray, X. Siemens, X. Siemens, R. Spiewak, R. Spiewak, I. Stairs, D. Stinebring, K. Stovall, J. Swiggum, R. V. Haasteren, C. Witt, Weiwei Zhu   +68 more
semanticscholar   +1 more source

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, M. Brozović, N. Mastrodemos, J. Riedel, S. Sheppard   +4 more
semanticscholar   +1 more source

Refining the Transit-timing and Photometric Analysis of TRAPPIST-1: Masses, Radii, Densities, Dynamics, and Ephemerides [PDF]

The Planetary Science Journal, 2020
We have collected transit times for the TRAPPIST-1 system with the Spitzer Space Telescope over four years. We add to these ground-based, HST, and K2 transit-time measurements, and revisit an N-body dynamical analysis of the seven-planet system using our
E. Agol, C. Dorn, S. Grimm, M. Turbet, E. Ducrot, L. Delrez, M. Gillon, B. Demory, A. Burdanov, K. Barkaoui, Z. Benkhaldoun, É. Bolmont, A. Burgasser, S. Carey, J. de Wit, D. Fabrycky, D. Foreman-Mackey, J. Haldemann, David M. Hernandez, J. Ingalls, E. Jehin, Zachary L. Langford, J. Leconte, S. Lederer, R. Luger, R. Malhotra, V. Meadows, B. Morris, F. Pozuelos, D. Queloz, S. Raymond, F. Selsis, M. Sestovic, A. Triaud, V. Grootel   +34 more
semanticscholar   +1 more source