Results 111 to 120 of about 24,888 (220)

Assessment on the feasibility of future shepherding of asteroid resources [PDF]

, 2010
Most plausible futures for space exploration and exploitation require a large mass in Earth orbit. Delivering this mass requires overcoming the Earth's natural gravity well, which imposes a distinct obstacle to any future space venture.
McInnes, C.R., Sanchez, J.P.
core  

Discovery of Astrometric Accelerations by Dark Companions in the Globular Cluster ω Centauri

The Astrophysical Journal
We present results from the search for astrometric accelerations of stars in ω Centauri using 13 yr of regularly scheduled Hubble Space Telescope WFC3/UVIS calibration observations in the cluster core.
Imants Platais, Johannes Sahlmann, Léo Girardi, Vera Kozhurina-Platais, Sebastian Kamann, Dimitri Pourbaix, Florence Wragg, Gerard Lemson, Arik Mitschang   +8 more
doaj   +1 more source

Modeling Earth’s Magnetic Field for PolyITAN-12U Attitude Determination and Control

Mìkrosistemi, Elektronìka ta Akustika
This paper presents a simulation workflow that couples a Keplerian orbit propagator and the World Magnetic Model to generate along-track magnetic-field predictions for typical CubeSat LEO missions.
Dmytro V. Serhieiev, Yevhen Yu. Kovalenko   +1 more
doaj   +1 more source

Closeby Habitable Exoplanet Survey (CHES). III. Retrieval of Planetary Masses in Binaries Using the N-body Model with Radial Velocity and Astrometry Synergy

The Astrophysical Journal
Given that secular perturbations in a binary system not only excite high orbital eccentricities but also alter the planetary orbital inclination, the classical Keplerian orbital model is no longer applicable for orbital retrieval.
Xiumin Huang, Jianghui Ji, Chunhui Bao, Dongjie Tan, Su Wang, Yao Dong, Guo Chen   +6 more
doaj   +1 more source

Relativistic Phase Space Diffusion of Compact Object Binaries in Stellar Clusters and Hierarchical Triples

The Astrophysical Journal
The LIGO/Virgo detections of compact object mergers have posed a challenge for theories of binary evolution and coalescence. One promising avenue for producing mergers dynamically is through secular eccentricity oscillations driven by an external ...
Chris Hamilton, Roman R. Rafikov
doaj   +1 more source

Multi-orbit lunar GNSS constellation design with distant retrograde orbit and Halo orbit combination. [PDF]

Sci Rep, 2023
Wang K, Li K, Lv S, Jiao Y, Shen Y, Yue Z, Xu K.   +6 more
europepmc   +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

Modeling Binary Lenses and Sources with the BAGLE Python Package

The Astrophysical Journal
Gravitational microlensing is a powerful tool that can be used to find and measure the mass of isolated and dark compact objects. In many microlensing events, the lens, the source, or both may be binary systems.
T. Dex Bhadra, J. R. Lu, Natasha S. Abrams, Andrew Scharf, Edward Broadberry, Casey Lam, Macy J. Huston   +6 more
doaj   +1 more source

A Comparative Study of Time on Mars with Lunar and Terrestrial Clocks

The Astronomical Journal
As space exploration extends into cislunar space and further toward Mars, understanding the relativistic effects on clocks on Mars—particularly in relation to multibody gravitational influences—becomes increasingly important for accurate clock ...
Neil Ashby, Bijunath R. Patla
doaj   +1 more source

Balancing the effects of solar radiation pressure on the orbital elements of a spacecraft using Lorentz force. [PDF]

Sci Rep, 2022
Yousef MA, El-Saftawy MI, Mostafa A.
europepmc   +1 more source