Results 101 to 110 of about 909 (203)

Innovative approach for modelling gravity-induced signal path variations of VLBI radio telescopes

Earth, Planets and Space
Gravitationally induced deformation of the receiving unit of radio telescopes used for Very Long Baseline Interferometry (VLBI) distorts the observations and biases the deduced products.
Michael Lösler, Cornelia Eschelbach, Ansgar Greiwe, Boye Zhou, Lucia McCallum   +4 more
doaj   +1 more source

Radio Astrometry

, 1974
The utilization of conventional and VLBI interferometer techniques for accurate determination of UTI, polar motion, and radio source position catalog data is ...
Johnston, K. J.
core  

Fermi Unassociated Sources in the MeerKAT Absorption Line Survey

The Astrophysical Journal
Over 2000 γ -ray sources identified by the Large Area Telescope on NASA's Fermi Gamma-ray Space Telescope are considered unassociated, meaning that they have no known counterparts in any other frequency regime.
Morgan Himes, Preshanth Jagannathan, Dale A. Frail, Frank Schinzel, Neeraj Gupta, S. A. Balashev, F. Combes, P. P. Deka, H.-R. Klöckner, E. Momjian, J. D. Wagenveld   +10 more
doaj   +1 more source

Radio Astronomical Antennas in the Central African Region to Improve the Sampling Function of the VLBI Network in the SKA Era? [PDF]

Sensors (Basel), 2022
Atemkeng M, Okouma P, Maina E, Ianjamasimanana R, Zambou S.   +4 more
europepmc   +1 more source

Astrometry at 24 and 43 GHz

, 2003
We describe the goals and initial results of a collaboration formed to survey extragalactic objects at radio frequencies of 24 and 43 GHz This survey is for extending the International Celestial Reference Frame (ICRF) that is the current coordinate ...
Fey, A., Ma, C. - C., Boboltz, D., Sovers, O. J., Naudet, C. J., Charlot, P., Gordon, D., Zhang, L. D., Lanyi, Gabor E., Jacobs, C. S., Fomalont, E.   +10 more
core  

Precision Southern Hemisphere VLBI Pulsar Astrometry. II. Measurement of Seven Parallaxes

, 2009
Accurate measurement of pulsar distances via astrometry using very long baseline interferometry enables the improvement of Galactic electron density distribution models, improving distance estimates for the vast majority of pulsars for which parallax ...
Deller, A., Bailes, M., Reynolds, J., Tingay, Steven   +3 more
core   +1 more source

Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

The Astrophysical Journal Supplement Series
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric ...
Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert   +5 more
doaj   +1 more source

The use of astronomy VLBA campaign MOJAVE for geodesy. [PDF]

J Geod, 2021
Krásná H, Petrov L.
europepmc   +1 more source

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Orbital period change of Dimorphos due to the DART kinetic impact. [PDF]

Nature, 2023
Thomas CA, Naidu SP, Scheirich P, Moskovitz NA, Pravec P, Chesley SR, Rivkin AS, Osip DJ, Lister TA, Benner LAM, Brozović M, Contreras C, Morrell N, Rożek A, Kušnirák P, Hornoch K, Mages D, Taylor PA, Seymour AD, Snodgrass C, Jørgensen UG, Dominik M, Skiff B, Polakis T, Knight MM, Farnham TL, Giorgini JD, Rush B, Bellerose J, Salas P, Armentrout WP, Watts G, Busch MW, Chatelain J, Gomez E, Greenstreet S, Phillips L, Bonavita M, Burgdorf MJ, Khalouei E, Longa-Peña P, Rabus M, Sajadian S, Chabot NL, Cheng AF, Ryan WH, Ryan EV, Holt CE, Agrusa HF.   +48 more
europepmc   +1 more source