Results 31 to 40 of about 10,252 (275)

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

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

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, D. 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

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

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

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

Experimental 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, A. Tsiaras, B. Edwards, M. Rocchetto, G. Tinetti, A. Wünsche, N. Paschalis, V. Agnihotri, M. Bachschmidt, M. Bretton, H. Caines, M. Cal'o, R. Casali, M. Crow, S. Dawes, M. Deldem, D. Deligeorgopoulos, R. Dymock, P. Evans, C. Falco, S. Ferratfiat, M. Fowler, S. Futcher, P. Guerra, Francois Hurter, A. Jones, W. Kang, Taewoo Kim, Richard Lee, C. Lopresti, A. Marino, M. Mallonn, F. Mortari, M. Morvan, L. Mugnai, A. Nastasi, V. Perroud, C. Pereira, M. Phillips, P. Pintr, M. Raetz, F. Regembal, J. Savage, D. Sedita, N. Sioulas, I. Strikis, G. Thurston, A. Tomacelli, A. Tomatis   +48 more
semanticscholar   +1 more source

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

Geodesy 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

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

Astronomical 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, Joseph E. Rodriguez, A. Bieryla, A. Vanderburg, T. Močnik, S. Kane, S. Quinn, K. Col'on, G. Zhou, J. Eastman, Chelsea X. Huang, D. Latham, J. Dotson, J. Jenkins, G. Ricker, S. Seager, R. Vanderspek, J. Winn, T. Barclay, G. Barentsen, Z. Berta-Thompson, D. Charbonneau, D. Dragomir, T. Daylan, M. Gunther, C. Hedges, C. Henze, S. McDermott, J. Schlieder, E. Quintana, Jeffrey C. Smith, J. Twicken, D. Yahalomi   +32 more
semanticscholar   +1 more source

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

Universe, 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