Results 111 to 120 of about 33,325 (239)

Polar motion and UT1: Comparison of VLBI, lunar laser, satellite laser, satellite Doppler, and conventional astrometric determinations [PDF]

Very long baseline interferometry observations made with a 3900 km baseline interferometer (Haystack Observatory in Massachusetts to Owens Valley Observation in California) were used to estimate changes in the X-component of the position of the Earth's ...
Clark, T. A., Coates, R. J., Corey, B. E., Counselman, C. C., III, Hinteregger, H. F., King, R. W., Ma, C., Robertson, D. S., Ryan, J. W., Shapiro, I. I.   +9 more
core   +1 more source

Spacecraft-spacecraft very long baseline interferometry. Part 1: Error modeling and observable accuracy [PDF]

In Part 1 of this two-part article, an error budget is presented for Earth-based delta differential one-way range (delta DOR) measurements between two spacecraft.
Border, J. S., Edwards, C. D., Jr.
core   +1 more source

The Subparsec-scale Structure and Evolution of Centaurus A. III. A Multi-epoch Spectral and Polarimetric VLBA Study

The Astronomical Journal
The Centaurus A radio galaxy, due to its proximity, presents itself as one of the few systems that allow the study of relativistic jet outflows at subparsec distances from the central supermassive black holes, with high signal to noise.
S. Prabu, S. J. Tingay, A. Bahramian, J. C. A. Miller-Jones, C. M. Wood, S. P. O’Sullivan   +5 more
doaj   +1 more source

The third realization of the International Celestial Reference Frame by very long baseline interferometry [PDF]

, 2020
P. Charlot, C. S. Jacobs, D. Gordon, S. Lambert, A. de Witt, J. Böhm, A. L. Fey, R. Heinkelmann, E. Skurikhina, O. Titov, E. F. Arias, S. Bolotin, G. Bourda, C. Ma, Z. Malkin, A. Nothnagel, D. Mayer, D. S. MacMillan, T. Nilsson, R. Gaume   +19 more
openalex   +1 more source

Application of the Tianwen-1 DOR Signals Observed by Very Long Baseline Interferometry Radio Telescopes in the Study of Solar Wind Plasma and a Coronal Mass Ejection [PDF]

, 2023
Zhichao Wang, Maoli Ma, Qinghui Liu, Qingbao He, Xin Zheng, Lijia Liu, Guifre Molera Calvés   +6 more
openalex   +1 more source

Geophysical and astronomical models applied in the analysis of very long baseline interferometry [PDF]

Very long baseline interferometry presents an opportunity to measure at the centimeter level such geodetic parameters as baseline length and instantaneous pole position.
Ma, C., Ryan, J. W., Schupler, B. R.
core   +1 more source

Very Long Baseline Interferometry [PDF]

Nature, 1973
openaire   +1 more source

Proposed satellite laser ranging and very long baseline interferometry sites for crustal dynamics investigations [PDF]

Recommendations are presented for a global network of 125 sites for geodetic measurements by satellite laser ranging and very long baseline interferometry. The sites were proposed on the basis of existing facilities and scientific value for investigation
Allenby, R. J., Frey, H. V., Lowman, P. D.   +2 more
core   +1 more source

A determination of the radio-planetary frame tie from comparison of Earth orientation parameters [PDF]

, 1992
The orientation of the reference frame of radio source catalogs relative to that of planetary ephemerides, or 'frame tie,' can be a major systematic error source for interplanetary spacecraft orbit determination.
Finger, M. H., Folkner, W. M.
core   +1 more source

Prospects of Detecting a Jet in Sagittarius A* with Very-long-baseline Interferometry

The Astrophysical Journal
Event Horizon Telescope (EHT) images of the horizon-scale emission around the Galactic center supermassive black hole Sagittarius A* (Sgr A*) favor accretion flow models with a jet component. However, this jet has not been conclusively detected.
Erandi Chavez, Sara Issaoun, Michael D. Johnson, Paul Tiede, Christian Fromm, Yosuke Mizuno   +5 more
doaj   +1 more source