Results 61 to 70 of about 19,555 (207)

Aqueye optical observations of the Crab Nebula pulsar

, 2012
We observed the Crab pulsar in October 2008 at the Copernico Telescope in Asiago - Cima Ekar with the optical photon counter Aqueye (the Asiago Quantum Eye) which has the best temporal resolution and accuracy ever achieved in the optical domain (hundreds
Barbieri, C., Barbieri, M., Cadez, A., Calvani, M., Capraro, I., Di Paola, A., Facchinetti, C., Germanà, C., Naletto, G., Occhipinti, T., Ponikvar, D., Possenti, A., Verroi, E., Zampieri, L., Zoccarato, P.   +14 more
core   +1 more source

Refinement of a Framework for Moving Aircraft River Velocimetry (MARV) and Application to Particle Tracking Along Alaskan Rivers

Water Resources Research, Volume 62, Issue 5, May 2026.
Abstract Information on river velocities enhances understanding flood hazards, evaluating habitat conditions, and predicting the transport of floating materials. In this follow‐up study, we used data from two new sites, one with a more complex morphology and the other with a lower suspended sediment concentration, to provide further evidence that ...
Carl J. Legleiter, Paul J. Kinzel, Mark Laker, Jeffrey S. Conaway   +3 more
wiley   +1 more source

DETERMINATION OF THE EPHEMERIS ACCURACY FOR AJISAI, LAGEOS AND ETALON SATELLITES, OBTAINED WITH A SIMPLIFIED NUMERICAL MOTION MODEL USING THE ILRS COORDINATES

Odessa Astronomical Publications, 2013
This paper describes a simplified numerical model of passive artificial Earth satellite (AES) motion. The model accuracy is determined using the International Laser Ranging Service (ILRS) highprecision coordinates. Those data are freely available on http:
I. V. Kara
doaj   +1 more source

Eclipses of the inner satellites of Jupiter observed in 2015

, 2016
During the 2014-2015 campaign of mutual events, we recorded ground-based photometric observations of eclipses of Amalthea (JV) and, for the first time, Thebe (JXIV) by the Galilean moons.
Arlot, J. -E., Christophe, B., Colas, F., Dechambre, O., Emelyanov, N., Robert, V., Saquet, E.   +6 more
core   +3 more sources

GOES‐R Series X‐Ray Sensor (XRS): 2. On‐Orbit Measurements and Calibrations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract An X‐Ray Sensor (XRS) has been onboard each of the National Oceanic and Atmospheric Administration (NOAA) Geostationary Operational Environmental Satellites (GOES) since 1975. XRS measures full‐disk soft X‐ray irradiance in two wavelength bands, 0.05–0.4 nm and 0.1–0.8 nm.
Janet L. Machol, Stefan M. Codrescu, Courtney L. Peck, Elysia S. Lucas, James F. Mothersbaugh III, Thomas N. Woods, Ann Marie Mahon, James Negus, Donald L. Woodraska, Thomas D. Eden Jr., Francis G. Eparvier, Andrew R. Jones, Brooke Kotten, Laurel A. Rachmeler, Andrew C. Wilson, Brian T. Kress, Juan V. Rodriguez, Rodney A. Viereck   +17 more
wiley   +1 more source

Apophis source population and Earth encounter frequency of Apophis-like bodies

Astronomy & Astrophysics
Context. Asteroid (99942) Apophis will safely pass by the Earth in April 2029. This extraordinary event will be observable by the naked eye from Africa and western Europe. Aims.
Brož M., Binzel R. P., Vernazza P., Marsset M., Chrenko O., Ďurech J., Herald D.   +6 more
doaj   +1 more source

Orbits of four double stars [PDF]

Serbian Astronomical Journal, 2006
We present orbits of four double stars. Orbits of stars WDS 23516+4205 = ADS 17050 and WDS 18239+5848 = ADS 11336 were calculated for the first time. Orbits of double stars WDS 02022+3643 = ADS 1613 and WDS 18443+3940 = ADS 11635 were revised.
Novaković B., Todorović N.
doaj   +1 more source

Gravitomagnetism and the Earth-Mercury range

, 2011
We numerically work out the impact of the general relativistic Lense-Thirring effect on the Earth-Mercury range caused by the gravitomagnetic field of the rotating Sun.
Appourchaux, Ashby, Beck, Ciufolini, Cugusi, de Sitter, Degnan, Everitt, Everitt, Everitt, Fairbank, Fienga, Fienga, Folkner, Iorio, Iorio, Iorio, Krogh, Lense, Lorenzo Iorio, Mashhoon, Merkowitz, Milani, Milani, Murray, Ni, Peterson, Pijpers, Pijpers, Pitjeva, Pitjeva, Pitjeva, Schiff, Smith, Soffel, Standish, Su, Turyshev, Turyshev, Vrbik, Will   +40 more
core   +1 more source

Modeling the Detectability of Energetic Heliospheric Ions at Pluto During the New Horizons Flyby

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract We investigate the detectability of heliospheric helium ions at energies up to 100 keV by the New Horizons (NH) spacecraft during its flyby through Pluto's induced magnetosphere. The Pluto Energetic Particle Spectrometer Science Investigation energetic ion detector observed a reduction in their flux by an order of magnitude as the spacecraft ...
Randall T. Ruch, Sven Simon, Peter Kollmann, C. Michael Haynes   +3 more
wiley   +1 more source

Consistent tidal and rotational models for satellites in synchronous rotation

Astronomy & Astrophysics
Tidal dissipation in natural satellites plays a crucial role in shaping their thermal state, internal structure, and evolution; for example, sustaining subsurface oceans in Europa and Enceladus and driving Io’s volcanic activity.
Magnanini Andrea, Zannoni Marco, Lainey Valery   +2 more
doaj   +1 more source