Results 41 to 50 of about 11,650 (287)

Gas-surface interactions modelling influence on satellite aerodynamics and thermosphere mass density

Journal of Space Weather and Space Climate, 2021
The satellite acceleration data from the CHAMP, GRACE, GOCE, and Swarm missions provide detailed information on the thermosphere density over the last two decades.
March Günther, van den IJssel Jose, Siemes Christian, Visser Pieter N. A. M., Doornbos Eelco N., Pilinski Marcin   +5 more
doaj   +1 more source

Bivariate Infinite Series Solution of Kepler’s Equations

Mathematics, 2021
A class of bivariate infinite series solutions of the elliptic and hyperbolic Kepler equations is described, adding to the handful of 1-D series that have been found throughout the centuries.
Daniele Tommasini
doaj   +1 more source

Comparison of single and multi-spacecraft configurations for NEA deflection by solar sublimation [PDF]

, 2007
Since the first Near Earth Object (NEO) defence system, Project Icarus, was published in 1967, where the driving factor was a very short anticipating time (i.e.
Maddock, Christie, Radice, Gianmarco, Sanchez Cuartielles, Joan-Pau, Vasile, Massimiliano   +3 more
core   +1 more source

Preliminary capture trajectory design for Europa tomography probe [PDF]

, 2018
The objective of this work is the preliminary design of a low-DV transfer from an initial elliptical orbit around Jupiter into a final circular orbit around the moon Europa.
Colasurdo, Guido, Federici, Lorenzo, Zavoli, Alessandro   +2 more
core   +1 more source

Real-Time Orbit Determination for Future Korean Regional Navigation Satellite System [PDF]

Journal of Astronomy and Space Sciences, 2016
This paper presents an algorithm for Real-Time Orbit Determination (RTOD) of navigation satellites for the Korean Regional Navigation Satellite System (KRNSS), when the navigation satellites generate ephemeris by themselves in abnormal situations.
Hyungjik Oh, Sang-Young Park, Chandeok Park   +2 more
doaj   +1 more source

ASTROD and ASTROD I -- Overview and Progress [PDF]

, 2007
In this paper, we present an overview of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) and ASTROD I mission concepts and studies.
Anderson J. D., Chandler J. F., Kumar P., Ni W.-T., Pulido Patón A., Samain É., Tinto M., Wang H., WEI-TOU NI, Williams J. G., Williams J. G., Wu A.-M., Wu A.-M., Xie Y., Xiong Y.   +14 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

Solar Sailing: applications and technology advancement [PDF]

, 2011
Harnessing the power of the Sun to propel a spacecraft may appear somewhat ambitious and the observation that light exerts a force contradicts everyday experiences.
Macdonald, Malcolm
core   +2 more sources