Results 41 to 50 of about 3,764 (285)
Impact Rates in the Outer Solar System
The Planetary Science Journal, 2023 Previous studies of cometary impacts in the outer solar system used the spatial distribution of ecliptic comets (ECs) from dynamical models that assumed ECs began on low-inclination orbits (≲5°) in the Kuiper Belt.
David Nesvorný +4 more
doaj +1 more source
On the Secular Behavior of Irregular Satellites
The Astronomical Journal, 2004 Although analytical studies on the secular motion of the irregular satellites have been published recently, these theories have not yet been satisfactorily reconciled with the results of direct numerical integrations. These discrepancies occur because in secular theories the disturbing function is averaged over orbital motions, whereas instead one ...
Cuk, Matija, Burns, Joseph A.
openaire +2 more sources
IMPROVED INDOOR POSITIONING USING FINGERPRINT TECHNIQUE AND WEIGHTED K-NEAREST NEIGHBOUR [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 Global Navigation Satellite Systems are not effective when there is no direct line of sight between the user and the satellites, such as indoor environments and dense urban areas. Today, location-based services are used significantly due to their utility
S. Naderi Salim +6 more
doaj +1 more source
The Orbits of Jupiter’s Irregular Satellites
The Astronomical Journal, 2017 Abstract We report on the improved ephemerides for the irregular Jovian satellites. We used a combination of numerically integrated equations of motion and a weighted least-squares algorithm to fit the astrometric measurements. The orbital fits for 59 satellites are summarized in terms of state vectors, post-fit residuals, and mean ...
Marina Brozović, Robert A. Jacobson
openaire +1 more source
Determining Undersampled Coastal Tidal Harmonics Using Regularized Least Squares
Earth and Space Science, 2023 Satellite altimetry, which measures water level with global coverage and high resolution, provides an unprecedented opportunity for a wide and refined understanding of the changing tides in the coastal area.
Ruo‐Qian Wang +2 more
doaj +1 more source
Orbits of the Irregular Satellites of Uranus and Neptune
The Astronomical Journal, 2022 Abstract We report on an ephemerides update for the irregular satellites of Uranus and Neptune, including Nereid. Our data set contains ground-based and Voyager 2 position measurements of the satellites. Some of the new observations were reduced with respect to the GAIA star catalog and represent high-quality, modern astrometry.
Marina Brozović, Robert A. Jacobson
openaire +1 more source
Progress in Earth and Planetary Science, 2017 Equatorial plasma bubbles (EPBs) have been a longstanding and increasingly important subject because they cause severe scintillations in radio waves from Global Navigation Satellite System satellites.
Tatsuhiro Yokoyama
doaj +1 more source
IRREGULAR SATELLITE CAPTURE BY EXCHANGE REACTIONS [PDF]
The Astronomical Journal, 2008 The study of the origin of irregular satellites remains important in planetary science because it provides constraints on the formation process of giant planets and probes the properties of a now-extinct planetesimal disk that existed at 5-30 AU early in solar system history.
David Vokrouhlický +2 more
openaire +1 more source
Comparing methods to estimate cloud cover over the Baikal Natural Territory in December 2020
Solar-Terrestrial Physics, 2022 The paper addresses the issue of how much cloud cover data obtained using satellite and model-interpolation techniques are suitable for monitoring the transparency of the atmosphere and determining conditions for airglow observations at a local ...
Podlesny S. V. +3 more
doaj +1 more source
Photometry of Irregular Satellites of Uranus and Neptune [PDF]
The Astrophysical Journal, 2004 13 pages (including 3 figures and 2 tables).
Grav, Tommy +2 more
openaire +2 more sources