Results 71 to 80 of about 6,726 (227)

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

On the contribution of PRIDE-JUICE to Jovian system ephemerides [PDF]

, 2017
The Jupiter Icy Moons Explorer (JUICE) mission will perform detailed measurements of the properties of the Galilean moons, with a nominal in-system science-mission duration of about 3.5 years.
D. Dirkx, L. Gurvits, V. Lainey, G. Lari, A. Milani, G. Cimò, T. Bocanegra-Bahamon, P. Visser   +7 more
semanticscholar   +1 more source

Transit timing variations and linear ephemerides of confirmed Kepler transiting exoplanets [PDF]

Research in Astronomy and Astrophysics, 2018
We determine new linear ephemerides of transiting exoplanets using long-cadence de-trended data from quarters Q1 to Q17 of the Kepler mission. We analysed transit-timing variation (TTV) diagrams of 2098 extrasolar planets.
Pavol Gajdoš, M. Vavnko, vStefan Parimucha   +2 more
semanticscholar   +1 more source

Orbits for sixteen binaries [PDF]

Serbian Astronomical Journal, 2006
In this paper orbits for 13 binaries are recalculated and presented. The reason is that recent observations show higher residuals than the corresponding ephemerides calculated by using the orbital elements given in the Sixth Catalog of Orbits of Visual ...
Cvetković Z., Novaković B.
doaj   +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

ACCURACY TESTING OF THE ONLINE FREE GNSS PPP SERVICES, AS A FUNCION OF OBSERVATION DURATION AND THE ELAPSED TIME FROM MEASUREMENT EPOCH TO EPOCH OF MEASUREMENT COMPUTATION [PDF]

Geodetski Glasnik, 2011
Use of PPP has become possible since the advent of precise satellite ephemerides and clock corrections from IGS. This work represents a research in attainable accuracy and reliability of the free online GNSS services (APPS, CSRS, GAPS, magicGNSS ...
Denis Tabučić, Medžida Mulić, Asim Bilajbegović   +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

Precise Real-Time Navigation of LEO Satellites Using a Single-Frequency GPS Receiver and Ultra-Rapid Ephemerides [PDF]

arXiv.org, 2017
Precise (sub-meter level) real-time navigation using a space-capable single-frequency global positioning system (GPS) receiver and ultra-rapid (real-time) ephemerides from the international global navigation satellite systems service is proposed for low ...
Xiucong Sun, Chao Han, Pei Chen
semanticscholar   +1 more source

Measuring Titan’s rapid orbital expansion combining Cassini radio science normal points and astrometry

Astronomy & Astrophysics
Recent analyses of Titan’s orbital migration have yielded conflicting results regarding Saturn’s tidal dissipation (Q) at Titan’s frequency. While some studies reported a low Q consistent with resonance locking using independent radio science and ...
Magnanini Andrea, Lainey Valery, Gomez Casajus Luis, Zannoni Marco, Tortora Paolo   +4 more
doaj   +1 more source