Results 51 to 60 of about 30,911 (193)

Prospects of dynamical determination of General Relativity parameter beta and solar quadrupole moment J2 with asteroid radar astronomy

, 2017
We evaluated the prospects of quantifying the parameterized post-Newtonian parameter beta and solar quadrupole moment J2 with observations of near-Earth asteroids with large orbital precession rates (9 to 27 arcsec century$^{-1}$). We considered existing
Greenberg, Adam H., Margot, Jean-Luc, Verma, Ashok K.   +2 more
core   +1 more source

Gaia: The Astrometry Revolution [PDF]

, 2015
The power of micro-arcsecond ($\mu$as) astrometry is about to be unleashed. ESA's Gaia mission, now headed towards the end of the first year of routine science operations, will soon fulfil its promise for revolutionary science in countless aspects of ...
Bonavita, M., Desidera, S., Gratton, R., Lattanzi, M. G., Sozzetti, A.   +4 more
core   +2 more sources

SST Anywhere—A Portable Solution for Wide Field Low Earth Orbit Surveillance

Remote Sensing, 2022
The low-Earth orbit (LEO) is filled with active satellites, but also with space debris, which need constant observation. The orbiting objects may be affected by collisions or by atmospheric drag, and therefore they can change their orbit or even fall to ...
Radu Gabriel Danescu, Razvan Itu, Mircea Paul Muresan, Ana Rednic, Vlad Turcu   +4 more
doaj   +1 more source

FinalKAN: A Dual‐Stream KAN Network Integrating Multisource Features for Radio Telescope Pointing Correction

Advances in Astronomy, Volume 2026, Issue 1, 2026.
This paper investigates the degradation of pointing accuracy in the Kunming 40‐m radio telescope due to long‐term equipment aging and environmental disturbances. Conventional linear pointing models are constrained by their linear modeling framework, making it difficult to accurately represent the nonlinear errors induced by temperature, wind speed, and
Yao He, Longfei Hao, Wei Dai, Fernando Aguado Agelet   +3 more
wiley   +1 more source

Exoplanet search with astrometry

, 2009
Searching for extrasolar planets by direct detection is extremely challenging for current instrumentation. Indirect methods, that measure the effect of a planet on its host star, are much more promising and have indeed led to the discovery of nearly all ...
Launhardt, Ralf
core   +1 more source

Detection of the nearest Jupiter analog in radial velocity and astrometry data [PDF]

, 2019
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.The presence of Jupiter is crucial to the architecture of the Solar System and models underline this to be a generic feature of planetary systems.
Anglada-Escudé, Guillem, Butler, Paul R., Chanamé, Julio, Feng, Fabo, Janson, Markus, Jones, Hugh R. A., Tuomi, Mikko   +6 more
core   +3 more sources

The Orbits of Uranus, Its Satellites and Rings, the Gravity Field of the Uranian System, and the Orientation of the Poles of Uranus and Its Satellites

The Astronomical Journal
R. A. Jacobson determined the orbits of the Uranian satellites, the masses of Uranus and its satellites, and the orientation of the pole of Uranus from Earth-based astrometry, Earth-based ring occultations, and observations acquired with the Voyager 2 ...
Robert A. Jacobson, Ryan S. Park
doaj   +1 more source

Uncertainties in Historic Visual Double Star Measures—III Accurate Calibration Pairs

Astronomische Nachrichten, Volume 346, Issue 10, December 2025.
ABSTRACT Based on space‐based positions and proper motions, we present accurate rectilinear elements for 857 double star pairs over the celestial sphere. These elements allow for the computation of precision ephemeris Position Angles and Separations of these pairs.
Roderick R. Letchford, Graeme L. White
wiley   +1 more source

Sub-Microarcsecond Astrometry with SIM-Lite: A Testbed-based Performance Assessment

, 2008
SIM-Lite is an astrometric interferometer being designed for sub-microarcsecond astrometry, with a wide range of applications from searches for Earth-analogs to determining the distribution of dark matter.
B. Nemati, Goullioud R., Goullioud R., M. Shao   +3 more
core   +1 more source

ASTRA: ASTrometry and phase-Referencing Astronomy on the Keck interferometer [PDF]

, 2010
ASTRA (ASTrometric and phase-Referencing Astronomy) is an upgrade to the existing Keck Interferometer which aims at providing new self-phase referencing (high spectral resolution observation of YSOs), dual-field phase referencing (sensitive AGN ...
Akeson, R., Appleby, E., Berkey, B., Colavita, M., Cooper, A., Eisner, J., Felizardo, C., Ghez, A., Graham, J., Herstein, J., Hillenbrand, L., Hrynevych, M., Martin, O., Medeiros, D., Millan-Gabet, R., Monnier, J., Morrison, D., Panteleeva, T., Pott, J. -U., Ragland, S., Smith, B., Summers, K., Tsubota, K., Tyau, C., Wetherell, E., Wizinowich, P., Woillez, J.   +26 more
core   +3 more sources