Results 111 to 120 of about 909 (203)

Lunar radio astrometry

, 1988
The accuracy of Earth-based radio astronomy is limited in a fundamental way by the variable delay of the troposphere and by the centimeter-scale motions of a dynamic Earth.
Linfield, Roger
core  

Algorithms for direct radio detections of exoplanets in the neighbourhood of radiating host stars

, 2018
Recent studies on extra solar planets (exoplanets) provide us with a new glimpse into the Milky Way's composition. Exoplanets appear to be very typical around Sun-like stars.
Bentum, Mark J., Mark J. Bentum
core   +1 more source

Simulation of Systematic Errors in Phase-Referenced VLBI Astrometry

, 2005
International audienceThe astrometric accuracy in the relative coordinates of two angularly-close radio sources observed with the phase-referencing VLBI technique is limited by systematic errors.
Charlot, P., Lestrade, J. -F., Pradel, N.   +2 more
core   +1 more source

Precise Mass, Orbital Motion, and Stellar Properties of the M-dwarf Binary LP 349−25AB

The Astrophysical Journal
LP 349−25 is a well-studied close stellar binary system comprised of two late M dwarf stars, where both stars are close to the limit between star and brown dwarf. This system was previously identified as a source of gigahertz radio emission.
Salvador Curiel, Gisela N. Ortiz-León, Amy J. Mioduszewski, Anthony B. Arenas-Martinez   +3 more
doaj   +1 more source

Main-oval Auroral Emission from a T6 Brown Dwarf: Observations, Modeling, and Astrometry

The Astrophysical Journal
From a series of 5 GHz Very Long Baseline Array (VLBA) radio observations taken over a 1 yr span, we present the detection of compact, highly polarized radio emission from the T6 brown dwarf WISE J112254.72+255022.2, compatible with electron cyclotron ...
J. C. Guirado, J. B. Climent, J. D. Bergasa, M. A. Pérez-Torres, J. M. Marcaide, L. Peña-Moñino   +5 more
doaj   +1 more source

Exploring nine simultaneously occurring transients on April 12th 1950. [PDF]

Sci Rep, 2021
Villarroel B, Marcy GW, Geier S, Streblyanska A, Solano E, Andruk VN, Shultz ME, Gupta AC, Mattsson L.   +8 more
europepmc   +1 more source

Astrometry with the 5-km Radio Telescope [PDF]

Monthly Notices of the Royal Astronomical Society, 1973
M. Ryle, B. Elsmore
openaire   +1 more source

The Celestial Reference Frame at K Band: The CRF-K-2025 Catalog

The Astronomical Journal
We present an updated K -band (24 GHz) celestial reference frame (CRF) constructed from ∼3.5 million very long baseline interferometry (VLBI) observations collected during 211 observing epochs between 2002 May and 2025 December using the Very Long ...
David Gordon, Aletha de Witt, Christopher S. Jacobs, Hana Krásná, Alessandra Bertarini, Jamie McCallum, Jonathan Quick, Cristina García-Miró, Taehyun Jung, Jeffrey A. Hodgson, Whee Yeon Cheong, Sang-Sung Lee, Do-Young Byun   +12 more
doaj   +1 more source

The high optical brightness of the BlueWalker 3 satellite. [PDF]

Nature, 2023
Nandakumar S, Eggl S, Tregloan-Reed J, Adam C, Anderson-Baldwin J, Bannister MT, Battle A, Benkhaldoun Z, Campbell T, Colque JP, Damke G, Plauchu Frayn I, Ghachoui M, Guillen PF, Kaeouach AE, Krantz HR, Langbroek M, Rattenbury N, Reddy V, Ridden-Harper R, Young B, Unda-Sanzana E, Watson AM, Walker CE, Barentine JC, Benvenuti P, Di Vruno F, Peel MW, Rawls ML, Bassa C, Flores-Quintana C, García P, Kim S, Longa-Peña P, Ortiz E, Otarola Á, Romero-Colmenares M, Sanhueza P, Siringo G, Soto M.   +39 more
europepmc   +1 more source

Radio astrometry from the Moon

, 1992
An array of three radio telescopes on the Moon, separated by 100-1000 km, could measure the positions of compact radio sources 50-100 times more accurately than can be done on Earth.
Linfield, R. P.
core