Results 121 to 130 of about 9,054 (229)

The first scientific experiment using Global e-VLBI observations: a multiwavelength campaign on the gamma-ray Narrow-Line Seyfert 1 PMN J0948+0022 [PDF]

, 2010
The detection of gamma-ray emission by Fermi-LAT from the radio loud Narrow Line Seyfert 1 PMN J0948+0022 (Abdo et al. 2009, ApJ 699, 976) triggered a multi-wavelength campaign between March and July 2009. Given its high compactness (Doi et al.
Paragi, Zsolt, Tzioumis, A.K., Foschini, L, Blanchard, J, Hong, X, Giroletti, Marcello, Kadler, M, Bignall, Hayley, Gabanyi, K, Doi, A, Nagai, H, Kino, M, Colomer, F, Sekido, M, Szomoru, A, Langevelde, H.J. van, Phillips, C   +16 more
core  

Estimation of Earth Rotation Parameters Based on BDS-3 and Discontinuous VLBI Observations

Remote Sensing
Earth rotation parameters (ERPs) are fundamental to geodetic and astronomical studies. With its high measurement accuracy and stability, the Very Long Baseline Interferometry (VLBI) plays an irreplaceable role in estimating the ERPs and maintaining the ...
Chenxiang Wang, Jizhang Sang, Xingxing Li, Pengfei Zhang   +3 more
doaj   +1 more source

Sphero-Conical Modeling for the Estimation of Very Long Baseline Interferometry Invariant Point. [PDF]

Sensors (Basel), 2022
Bae TS, Hong CK.
europepmc   +1 more source

Lunar Observations and Geodetic VLBI – A Simulation Study [Elektronisk resurs]

, 2017
The recent OCEL (Observing the Chang’E Lander with VLBI) sessions allow the geodetic VLBI community to gain new experience concerning observations of an artificial lunar radio source.
Klopotek, Grzegorz,, Haas, Rüdiger,, Hobiger, Thomas,   +2 more
core  

VLBI observations of H2O masers towards high-mass Young Stellar Objects [PDF]

, 2004
We have conducted multi-epoch VLBI observations of the 22.2 GHz water masers towards three massive star forming regions (Sh 2-255 IR, WB89-234, AFGL 5142). For the maser fetures persistent in time, accurate values of the proper motions are derived.
MOSCADELLI, Luca, Goddi, C.
core  

Adaption of the VLBI Standard Interface to the K5 VLBI System

Adaption of the VLBI Standard Interface to the K5 VLBI System
資料番号 ...
openaire   +1 more source

HartRAO Site Tie Measurements: VLBI and Ground Survey

, 2019
A first short baseline VLBI experiment between the Hartebeesthoek Radio Astronomy Observatory´s (HartRAO) 26m legacy and co-located 15m radio telescopes has been conducted. The local automated site tie system at HartRAO is currently being implemented and
Krasna, Hana, Combrinck, Ludwig, Nickola, Marisa, Schartner, Matthias, Böhm, Johannes, Gruber, Jakob, Jacobs, Christopher, de Witt, Aletha, Botha, Roelf   +8 more
core  

Improvement of orbit determination for geostationary satellites with VLBI tracking

, 2011
China's COMPASS satellite navigation system consists of five or more geostationary (GEO) satellites. The roles of GEO satellites are to improve the regional user's positioning accuracy and provide the continuous Radio Determination Satellite Service. The
Shi ShanBin, Wang Hong, Hu XiaoGong, Guo Rui, Huang Yong, Jiang DongRong, Zhang XiuZhong   +6 more
core   +1 more source

The Synergy between VLBI and Gaia astrometry

, 2018
With the publication of Gaia DR2, 1.3 billion stars now have public parallax and proper motion measurements. In this contribution, we compare the results for sources that have both optical and radio measurements, focusing on circumstellar masers.
van Langevelde, H. J.,, Honma, Mareki,, Vlemmings, Wouter,, Loinard, L.,, Burns, R. A.,, Michael Rich, R.,, Deane, R. P.,, Natarajan, Iniyan,, Immer, K.,, Quiroga-Nuñez, L.H.,, Nakagawa, A.,, Pihlstrom, Y.,, Sjouwerman, Loránt Olivér,   +12 more
core  

Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination. [PDF]

Earth Planets Space, 2022
Böhm S, Böhm J, Gruber J, Kern L, McCallum J, McCallum L, McCarthy T, Quick J, Schartner M.   +8 more
europepmc   +1 more source