Results 61 to 70 of about 753,460 (195)

Research on the Autonomous Orbit Determination of Beidou-3 Assisted by Satellite Laser Ranging Technology

Remote Sensing
The Beidou Global System (BDS-3) innovatively achieves autonomous navigation using inter-satellite links (ISL) across the entire constellation, but it still faces challenges such as the limitations of the prior constraint orbital accuracy and the overall
Wei Xiao, Zhengcheng Wu, Zongnan Li, Lei Fan, Shiwei Guo, Yilun Chen   +5 more
doaj   +1 more source

Speckle Observations With PISCO in Calern (France): III. Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain.
J.‐L. Prieur, M. Scardia, J.‐P. Rivet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini, D. Vernet   +11 more
wiley   +1 more source

Design and Implementation of an Intelligent Horizontal Single‐Axis Solar Tracking (HSAT) Using a Fuzzy Logic Approach for Maximum Solar Radiation Absorption

Engineering Reports, Volume 8, Issue 8, August 2026.
Block diagram representation of solar tracking system. ABSTRACT An intelligent horizontal single axis solar tracking system was designed and implemented, as documented in this paper. A hybrid control strategy was employed to perform solar tracking.
Mulugeta Berhe Hagos, Tilahun Beyene Tessema, Chala Merga Abdissa   +2 more
wiley   +1 more source

Lunar Trailblazer Spacecraft Tracking and Mission Recovery Attempt: Characterization of Status and Behavior of a Non‐Cooperative Object in Cis‐Lunar Space

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Unexpectedly following launch, the Lunar Trailblazer mission experienced software anomalies that led it to orient solar panels away from the sun and lose communication with Earth. This paper describes efforts to determine the spacecraft state and attempt recovery of the mission's science at the Moon.
B. L. Ehlmann, J. Bellerose, G. Lantoine, E. Furlan, E. Scire, S. Fajardo‐Acosta, L. Bennett, M. Sanchez Net, T. J. W. Lazio, M. Brozović, J. Masiero, A. V. Steckel, P. A. Burke, M. Kimura, S. Foxman, M. P. M. Zaw, L. M. Lee, F. Clarke, M. Hauge, D. McDonald, J. Adler, R. Strauss, D. Trilling, C. S. Edwards, M. C. Nolan, D. Lyster, L. Robinson, A. T. Klesh, C. C. Seybold   +28 more
wiley   +1 more source

Observational Data and Orbits of the Asteroids Discovered at the Molėtai Observatory in 2005–2007

Open Astronomy, 2016
The paper presents statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania, in 2005–2007 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets.
Černis K., Wlodarczyk I., Zdanavičius J.   +2 more
doaj   +1 more source

Empirical Assessment of Storm‐Time Thermospheric Density Inversion Methods From LEO POD Data

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract Thermospheric mass density is one of the largest sources of operational uncertainty for spacecraft in low Earth orbit, particularly during geomagnetic storms. The growing population of Global Navigation Satellite System‐equipped satellites presents a data set of opportunity: precise orbit determination (POD) data streams can be used to ...
Charles Constant, Indigo Brownhall, Anasuya Aruliah, Marek Ziebart, Santosh Bhattarai   +4 more
wiley   +1 more source

Improvement of the ephemerides of Phoebe, 9th satellite of Saturn, from new observations made from 1995 to 2000

, 2003
International audienceIn order to improve the model used for the ephemerides of Phoebe, the 9th satellite of Saturn, we started observations in 1998. We made 135 observations in 1998 and 39 observations in 1999 using the 120 cm-telescope of Observatoire ...
Bec-Borsenberger, Annick, Arlot, Jean-Eudes, Baron, Nicole, Fienga, Agnès   +3 more
core   +5 more sources

Observational Data and Orbits of the Asteroids Discovered at the Molėtai Observatory in 2008–2009

Open Astronomy, 2016
We present the statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania, in 2008–2009 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets.
Černis K., Wlodarczyk I., Zdanavičius J.   +2 more
doaj   +1 more source

Connectivity Between Primary and Secondary Subglacial Drainage Subsystems Beneath a Land‐Terminating Outlet Glacier of the Greenland Ice Sheet

AGU Advances, Volume 7, Issue 5, August 2026.
Abstract The evolution and connectivity of subglacial drainage systems control basal sliding and therefore modulate ice motion, yet direct observations of these systems remain limited. Here, we investigate hydraulic connectivity and its influence on ice motion at Isunnguata Sermia, a large land‐terminating outlet glacier of the Greenland Ice Sheet.
R. Ing, E. Bagshaw, J. Hawkins, M. Peacey, S. Doyle, S. Livingstone, M. Prior‐Jones, S. Thorpe, A. Moffatt, A. Sole, G. Bianchi, A. Booth, S. Buzzard, T. Chudley, C. Clason, L. Craw, L. Edwards, F. Gimbert, A. Hepburn, A. Jones, T. Le Bris, S. Mann, A. Michel, N. Ross, R. Storrar, R. Veness, T. Young   +26 more
wiley   +1 more source

Low Frequency Extensions of Cyclotron Maser Instability‐Generated Radio Emission: A Statistical View From Cassini at Saturn

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The Cassini spacecraft spent 13 years orbiting Saturn, quasi‐continuously measuring Saturn's radio emissions. One of the key elements of the radio spectrum at Saturn is the Saturn Kilometric Radiation (SKR), and several studies have been written on events called Low Frequency Extensions (LFEs) which represent strong, continuous extensions of ...
C. M. Jackman, A. R. Fogg, S. W. H. Cowley, G. Provan, H. Adamski, N. M. Besch, D. M. Hollman, S. Walker, M. J. Rutala, L. Lamy, C. K. Louis, E. P. O’Dwyer   +11 more
wiley   +1 more source