Results 111 to 120 of about 135,824 (242)

Calculating Global Navigation Satellite System Satellite Velocities and Accelerations by Utilizing the Orbit Fitting and Orbit Integration Methods

Remote Sensing
The high-precision satellite velocities and accelerations calculated by the Global Navigation Satellite System (GNSS) are essential for tasks such as airborne gravity data processing.
Chuanfeng Song, Shilong Geng, Liang Chen, Xiangdong An, Hongyang Ma   +4 more
doaj   +1 more source

TEE, a simple estimator for the precision of eclipse and transit minimum times

, 2017
Context: Transit or eclipse timing variations have proven to be a valuable tool in exoplanet research. However, no simple way to estimate the potential precision of such timing measures has been presented yet, nor are guidelines available regarding the ...
Deeg, Hans J., Tingley, Brandon
core   +1 more source

A Sub-Neptune-sized Planet Transiting the M2.5 Dwarf G 9-40: Validation with the Habitable-zone Planet Finder [PDF]

, 2020
We validate the discovery of a 2-Earth-radii sub-Neptune-sized planet around the nearby high-proper-motion M2.5 dwarf G 9-40 (EPIC 212048748), using high-precision, near-infrared (NIR) radial velocity (RV) observations with the Habitable-zone Planet ...
Roy, Arpita, Stefansson, Gudmundur
core  

A Multi‐Platform Statistical Analysis of the Azimuthal Spatial Extent of the Microburst Precipitation Region

Journal of Geophysical Research: Space Physics, Volume 129, Issue 12, December 2024.
Abstract Microbursts are impulsive injections of energetic (few keV to >MeV) electrons into the atmosphere, primarily caused by nonlinear scattering driven by whistler mode chorus waves. While the relative importance of microburst precipitation as a loss process has not been fully quantified, many studies have shown microbursts may play a significant ...
S. S. Elliott, C. Colpitts, A. W. Breneman, J. M. Pettit, K. A. Cantwell, C. A. Cattell, A. J. Halford, M. Shumko, J. Sample, A. Johnson, Y. Miyoshi, Y. Kasahara, R. N. Troyer, R. Millan, T. Hori, I. Shinohara, S. Matsuda, A. Matsuoka   +17 more
wiley   +1 more source

A Global Combination of Geodetic Techniques at the Observation Level: New Perspectives on the Terrestrial Reference Frame

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 12, December 2024.
Abstract We describe the development and assessment of a new terrestrial reference frame (TRF) based on a combination of geodetic techniques at the observation level over the period 2010–2022. Included in the solution are observations from the Global Positioning System (GPS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI). A
B. Haines, W. Bertiger, S. Desai, M. Ellmer, M. Heflin, D. Kuang, G. Lanyi, C. Naudet, A. Peidou, P. Ries, A. Sibois, X. Wu   +11 more
wiley   +1 more source

Optical Photometry of LMXBs: UW CrB (=MS 1603+260) and V1408 Aql (=4U 1957+115)

Acta Polytechnica CTU Proceedings, 2015
We present new optical observations of V1408 Aql (= 4U 1957+115), the only low mass X-ray binary, black hole candidate known to be in a persistently soft state.
P. A. Mason, E. L. Robinson, S. Gomez, J. V. Segura   +3 more
doaj   +1 more source

The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b

, 2009
We present photometry of six transits of the exoplanet XO-2b. By combining the light-curve analysis with theoretical isochrones to determine the stellar properties, we find the planetary radius to be 0.996 +0.031/-0.018 rjup and the planetary mass to be ...
Avi Shporer, Bean, Beatty, Blackwell, Blackwell, Burke, Charbonneau, Demarque, Fischer, Ford, Fortney, Gilbert A. Esquerdo, Guillermo Torres, Holman, Holman, Johnson, Jose M. Fernandez, Joshua N. Winn, Mandel, Mark E. Everett, Matthew J. Holman, McCullough, Miller-Ricci, Press, Ramírez, Seager, Sozzetti, Steffen, Torres, Tsevi Mazeh, Winn, Yi   +31 more
core   +1 more source

Revisiting the Rigidly Rotating Magnetosphere model for sigma Ori E. I. Observations and Data Analysis

, 2011
We have obtained 18 new high-resolution spectropolarimetric observations of the B2Vp star sigma Ori E with both the Narval and ESPaDOnS spectropolarimeters.
Bohlender, Bolton, Borra, C. Neiner, Cidale, Deutsch, Donati, Donati, Donati, E. Alecian, G. A. Wade, Hesser, Hesser, J. Grunhut, Kaufer, Kemp, Krtic̆ka, Kupka, Landstreet, Landstreet, Landstreet, Lanz, Leone, Lomb, M. E. Oksala, Nakajima, O. Kochukhov, Pedersen, Piskunov, Preuss, Pyper, R. H. D. Townsend, Reiners, S. P. Owocki, Scargle, Shore, Short, Silvester, Smith, Stibbs, Townsend, Townsend, Townsend, Townsend, Veto, Wade, Wade, Walborn, Walborn   +48 more
core   +2 more sources

TEMPO2, a new pulsar timing package. I: Overview

, 2006
Contemporary pulsar timing experiments have reached a sensitivity level where systematic errors introduced by existing analysis procedures are limiting the achievable science.
Backer, Backer, Bell, Blandford, Damour, Damour, Feissel, Folkner, Foster, Foster, G. B. Hobbs, Guinot, Harada, Hilton, Hobbs, Hobbs, Irwin, Issautier, Jenet, Kopeikin, Kopeikin, Lange, Lieske, Lorimer, Lyne, Lyne, Lyne, Manchester, McCarthy, Petit, Phillips, Press, R. N. Manchester, R. T. Edwards, Ryba, Seiber, Seidelmann, Shapiro, Shklovskii, Spitzer, Splaver, Stairs, Standish, Standish, Taylor, Taylor, van der Swaluw, Wall, Wang, Wex, Wolszczan   +50 more
core   +1 more source

Closing the Gap Between SGP4 and High-Precision Propagation via Differentiable Programming [PDF]

Acta Astronautica 226(1) (2025) 8
The Simplified General Perturbations 4 (SGP4) orbital propagation method is widely used for predicting the positions and velocities of Earth-orbiting objects rapidly and reliably. Despite continuous refinement, SGP models still lack the precision of numerical propagators, which offer significantly smaller errors.
arxiv   +1 more source