Results 41 to 50 of about 11,731 (215)
Accurate Astrometry of 22 Southern Hemisphere Radio Sources [PDF]
The Astronomical Journal, 2004 Milliarcsecond-accurate radio positions for 22 southern hemisphere extragalactic sources are reported. These positions are derived from Mark III very long baseline interferometry observations made between 2003 February and 2003 August. The results presented here supplement an ongoing project to increase the sky density of southern hemisphere sources in
Alan L. Fey +11 more
openaire +1 more source
The Astrophysical Journal, 2023 We present the first results from the Southern Hemisphere Parallax Interferometric Radio Astrometry Legacy Survey: 10 μ as accurate parallaxes and proper motions for two Southern Hemisphere 6.7 GHz methanol masers obtained using the inverse MultiView ...
L. J. Hyland +13 more
doaj +1 more source
Relativistic gravitational deflection of light and its impact on the modeling accuracy for the Space Interferometry Mission [PDF]
, 2008 We study the impact of relativistic gravitational deflection of light on the accuracy of future Space Interferometry Mission (SIM). We estimate the deflection angles caused by the monopole, quadrupole and octupole components of gravitational fields for a
Turyshev, Slava G.
core +1 more source
Radio Astrometry Using Connected-Element Interferometers [PDF]
Symposium - International Astronomical Union, 1974 The basic techniques of conventional radio interferometry are explained and a review given of the achievements and limitations of the methods as applied to radio astrometry.
openaire +1 more source
Single-band VLBI Absolute Astrometry
The Astronomical Journal, 2023 The ionospheric path delay impacts single-band, very long baseline interferometry (VLBI) group delays, which limits their applicability for absolute astrometry.
Leonid Petrov
doaj +1 more source
Mid-Infrared Imaging of NGC 6334 I [PDF]
, 2002 We present high-resolution (
Caswell J. L. +11 more
core +2 more sources
MERLIN Astrometry of 11 Radio Stars
The Astronomical Journal, 2006 We report accurate positions in the International Celestial Reference Frame (ICRF) for 11 radio stars. Observations were made using the Multi-Element Radio Linked Interferometer Network at a radio frequency of 5 GHz. The positions are estimated to be accurate at the 5 mas level.
Alan L. Fey +5 more
openaire +1 more source
The Use of the Ratan-600 Radio Telescope in Astrometry [PDF]
Symposium - International Astronomical Union, 1986 The RATAN-600 radio telescope (Kaidanovsky & al. 1972) was designed for solving various problems of astrophysics and radiophysics (Pariisky & al. 1972, Gelfreikh & al. 1972). Because of its high resolving power and large collecting area, this instrument can be used to measure accurate positions of radio sources.
P. M. Afanasieva +5 more
openaire +1 more source
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 +3 more
wiley +1 more source
Differential Astrometry over 15 degrees
, 1998 We observed the pair of radio sources 1150+812 and 1803+784 in November 1993 with a VLBI array, simultaneously recording at 8.4 and 2.3 GHz. We determined the angular separation between the two sources with submilliarcsecond accuracy by using ...
Guirado, J. C. +3 more
core +1 more source