Results 41 to 50 of about 3,068 (209)

Celestial Navigation Methods for Space Explorers

Measurement + Control, 2008
With the development of the space exploration missions, a practical and reliable capability for autonomous navigation is urgently needed to reduce operation cost, to improve operational efficiency and to increase mission safety by avoiding dangerous ...
Fang Jiancheng, Ning Xiaolin
doaj   +1 more source

Assessing Reduced‐Dynamic Parametrizations for GRAIL Orbit Determination and the Recovery of Independent Lunar Gravity Field Solutions

Earth and Space Science, 2021
Orbit determination of probes visiting Solar System bodies is currently the main source of our knowledge about their internal structure, inferred from the estimate of their gravity field and rotational state.
S. Bertone, D. Arnold, V. Girardin, M. Lasser, U. Meyer, A. Jäggi   +5 more
doaj   +1 more source

Lunar and Planetary Science 38 [PDF]

, 2007
This conference included special sessions on: Mars Reconnaissance Orbiter: New Ways of Studying the Red Planet; SMART-1; and Volcanism and Tectonism on Saturnian Satellites.

core  

Determination of Venus’s Rotation State Using Radio-tracking Data from the Venus Express Spacecraft

The Planetary Science Journal
Despite its similarities to Earth, our understanding of Venus remains limited, particularly regarding its long retrograde rotation period. This has been measured using both Earth-based and in-orbit methods.
Maëva Lévesque, Pascal Rosenblatt, Jean-Charles Marty, Caroline Dumoulin   +3 more
doaj   +1 more source

Planetary Nebulae as Probes of Stellar Populations [PDF]

Proceedings of the International Astronomical Union, 2006
Planetary nebulae (PNe) have the potential to revolutionize our understanding of extragalactic stellar populations. Indeed, in many systems, bright PNe are the only individual objects identifiable from the ground, and, even more often, they are the only stars that are amenable to spectroscopy. We review the ways in which ensembles of PNe can be used to
openaire   +2 more sources

High-Fidelity Aerothermal Engineering Analysis for Planetary Probes Using DOTNET Framework and OLAP Cubes Database

International Journal of Aerospace Engineering, 2009
This publication presents the architecture integration and implementation of various modules in Sparta framework. Sparta is a trajectory engine that is hooked to an Online Analytical Processing (OLAP) database for Multi-dimensional analysis capability ...
Prabhakar Subrahmanyam
doaj   +1 more source

Radio sources in the Chandra Galactic Bulge Survey [PDF]

, 2012
We discuss radio sources in the Chandra Galactic Bulge Survey region. By cross-matching the X-ray sources in this field with the NRAO VLA Sky Survey archival data, we find 12 candidate matches.
Maccarone, M.C., MacCarone, Thomas J., Steeghs, Danny, Maccarone, T. J., Wijnands, R., Steeghs, D., Britt, Christopher T., Hynes, R.I., Torres, Manuel A.P., Wijnands, Rudy, Torres, M. A. P., Britt, C.T., Jonker, Peter G., Hynes, R. I., Nelemans, Gijs, Jonker, P. G., Hynes, Robert I., Torres, M.A.P., Jonker, P.G., Greiss, Sandra, Nelemans, G., Maccarone, T.J., Nelemans, G.A., Greiss, S., Britt, Christopher B. T.   +24 more
core   +1 more source

Post-Keplerian Perturbations of the Hyperbolic Motion in the Field of a Rotating Massive Object: Analysis in Terms of Osculating and Nonosculating (Contact) Elements

The Astrophysical Journal
The perturbations of the hyperbolic motion of a test particle due to the general relativistic gravitoelectromagnetic Schwarzschild and Lense–Thirring components of the gravitational field of a rotating massive body are analytically worked out to the ...
Lorenzo Iorio
doaj   +1 more source

Uranus Orbiter and Probe: Mission Challenges and Concept Updates Since the Origins, Worlds, and Life Decadal Survey

The Planetary Science Journal
Origins, Worlds, and Life: Planetary Science and Astrobiology in the Next Decade identified a Uranus Orbiter and Probe as the highest-priority strategic mission for the decade 2023–2032, as it enables broad cross-disciplinary science in the largely ...
Amy A. Simon, Richard C. Anderson, Daniel T. Gallagher, Michael J. Amato, Donald H. Ellison, Jacob A. Englander, Carl Engelbrecht, Noble Hatten, Richard S. Saylor, Chloe B. Beddingfield, Richard J. Cartwright, Nancy L. Chabot, Ian J. Cohen, Kathleen Mandt, Tom A. Nordheim, Lynnae C. Quick   +15 more
doaj   +1 more source

Post-Newtonian Orbital Effects Induced by the Mass Quadrupole and Spin Octupole Moments of an Axisymmetric Body

The Astronomical Journal
The post-Newtonian orbital effects induced by the mass quadrupole and spin octupole moments of an isolated, oblate spheroid of constant density that is rigidly and uniformly rotating on the motion of a test particle are analytically worked out for an ...
Lorenzo Iorio
doaj   +1 more source