Results 21 to 30 of about 1,847 (222)

Novel Structure and Thermal Design and Analysis for CubeSats in Formation Flying

Aerospace, 2021
The CANYVAL-C (CubeSat Astronomy by NASA and Yonsei using a virtual telescope alignment for coronagraph) is a space science demonstration mission that involves taking several images of the solar corona with two CubeSats—1U CubeSat (Timon) and 2U CubeSat (
Yeon-Kyu Park, Geuk-Nam Kim, Sang-Young Park   +2 more
doaj   +1 more source

Fuel Optimization for Low Earth Orbit Maintenance [PDF]

Journal of Astronomy and Space Sciences, 2008
The resolution of Earth images taken from a satellite has close relation with satellite's altitude. If a satellite has lower altitude, it gets a picture having better resolution.
Yong Jae Park, Sang-Young Park, Young-Rok Kim, Kyu-Hong Choi   +3 more
doaj   +1 more source

Laser-based Relative Navigation Using GPS Measurements for Spacecraft Formation Flying [PDF]

Journal of Astronomy and Space Sciences, 2015
This study presents a precise relative navigation algorithm using both laser and Global Positioning System (GPS) measurements in real time. The measurement model of the navigation algorithm between two spacecraft is comprised of relative distances ...
Kwangwon Lee, Hyungjik Oh, Han-Earl Park, Sang-Young Park, Chandeok Park   +4 more
doaj   +1 more source

Monitoring Terrestrial Water Storage, Drought and Seasonal Changes in Central Oklahoma With Ambient Seismic Noise

Geophysical Research Letters, Volume 50, Issue 17, 16 September 2023., 2023
Abstract Significant imbalances in terrestrial water storage (TWS) and severe drought have been observed around the world as a consequence of climate changes. Improving our ability to monitor TWS and drought is critical for water‐resource management and water‐deficit estimation.
Shuo Zhang, Bingxu Luo, Yehuda Ben‐Zion, David E. Lumley, Hejun Zhu   +4 more
wiley   +1 more source

An Energetic Eruption With Associated SO 1.707 Micron Emissions at Io's Kanehekili Fluctus and a Brightening Event at Loki Patera Observed by JWST

Journal of Geophysical Research: Planets, Volume 128, Issue 8, August 2023., 2023
Abstract We observed Io with the James Webb Space Telescope (JWST) while the satellite was in eclipse, and detected thermal emission from several volcanoes. The data were taken as part of our JWST‐ERS program #1373 on 15 November 2022. Kanehekili Fluctus was exceptionally bright, and Loki Patera had most likely entered a new brightening phase.
Imke de Pater, Emmanuel Lellouch, Darrell F. Strobel, Katherine de Kleer, Thierry Fouchet, Michael H. Wong, Bryan J. Holler, John Stansberry, Patrick M. Fry, Michael E. Brown, Dominique Bockelée‐Morvan, Samantha K. Trumbo, L. N. Fletcher, Matthew M. Hedman, Edward M. Molter, Mark Showalter, Matthew S. Tiscareno, Stéphanie Cazaux, Ricardo Hueso, Statia Luszcz‐Cook, Henrik Melin, Chris Moeckel, Alessandro Mura, Glenn Orton, Lorenz Roth, Joachim Saur, Federico Tosi   +26 more
wiley   +1 more source

The Thermosphere Is a Drag: The 2022 Starlink Incident and the Threat of Geomagnetic Storms to Low Earth Orbit Space Operations

Space Weather, Volume 21, Issue 3, March 2023., 2023
Abstract On 03 February 2022, SpaceX launched 49 Starlink satellites, 38 of which re‐entered the atmosphere on or about 07 February 2022 due to unexpectedly high atmospheric drag. We use empirical model (NRLMSIS, JB08, and HASDM) outputs as well as solar extreme ultraviolet occultation and high‐fidelity accelerometer data to show that thermospheric ...
T. E. Berger, M. Dominique, G. Lucas, M. Pilinski, V. Ray, R. Sewell, E. K. Sutton, J. P. Thayer, E. Thiemann   +8 more
wiley   +1 more source

Micro-to-macro: astrodynamics at extremes of lengths-scale [PDF]

, 2011
This paper investigates astrodynamics at extremes of length-scale, ranging from swarms of future `smart dust' devices to the capture and utilisation of small near Earth asteroids.
Bewick, Russell, Sanchez, J. P., Sanchez Cuartielles, J.P., Heiligers, Jeannette, McInnes, Colin, Ceriotti, Matteo, Ceriotti, M., Heiligers, J., Colombo, C., Colombo, Camilla, Sanchez Cuartielles, Joan-Pau, Mcinnes, C. R., Bewick, R., Lucking, C., Lucking, Charlotte, McInnes, C.R.   +15 more
core   +1 more source

Implications of cohesive strength in asteroid interiors and surfaces and its measurement

Progress in Earth and Planetary Science, 2018
Recent observations and theory have indicated that rubble pile asteroids may have a small, but finite, level of tensile strength, allowing them to spin above their spin deformation limit as defined in Holsapple (Icarus 205:430–442, 2010).
Daniel J. Scheeres, Paul Sánchez
doaj   +1 more source

Fast Switch and Spline Function Inversion Algorithm with Multistep Optimization and k-Vector Search for Solving Kepler’s Equation in Celestial Mechanics

Mathematics, 2020
Obtaining the inverse of a nonlinear monotonic function f(x) over a given interval is a common problem in pure and applied mathematics, the most famous example being Kepler’s description of orbital motion in the two-body approximation.
Daniele Tommasini, David N. Olivieri
doaj   +1 more source

Improved GPS-based Satellite Relative Navigation Using Femtosecond Laser Relative Distance Measurements [PDF]

Journal of Astronomy and Space Sciences, 2016
This study developed an approach for improving Carrier-phase Differential Global Positioning System (CDGPS) based realtime satellite relative navigation by applying laser baseline measurement data.
Hyungjik Oh, Han-Earl Park, Kwangwon Lee, Sang-Young Park, Chandeok Park   +4 more
doaj   +1 more source