Results 101 to 110 of about 9,456 (175)

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

The Australian mixed-mode observing program. [PDF]

J Geod, 2022
McCallum L, Chin Chuan L, Krásná H, McCallum J, Böhm J, McCarthy T, Gruber J, Schartner M, Quick J, Rogers A.   +9 more
europepmc   +1 more source

Hierarchical Interferometric Bayesian Imaging

The Astrophysical Journal
Very long baseline interferometry (VLBI) achieves the highest angular resolution in astronomy. VLBI measures corrupted Fourier components, known as visibilities.
Paul Tiede, William Moses, Valentin Churavy, Michael D. Johnson, Dominic W. Pesce, Lindy Blackburn, Peter Galison   +6 more
doaj   +1 more source

Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. [PDF]

Sensors (Basel), 2022
Raut S, Heinkelmann R, Modiri S, Belda S, Balidakis K, Schuh H.   +5 more
europepmc   +1 more source

Time frequency requirements for radio interferometric earth physics [PDF]

Two systems of VLBI (Very Long Baseline Interferometry) are now applicable to earth physics: an intercontinental baseline system using antennas of the NASA Deep Space Network, now observing at one-month intervals to determine UTI for spacecraft ...
Fliegel, H. F., Thomas, J. B.
core   +1 more source

A ring-like accretion structure in M87 connecting its black hole and jet. [PDF]

Nature, 2023
Lu RS, Asada K, Krichbaum TP, Park J, Tazaki F, Pu HY, Nakamura M, Lobanov A, Hada K, Akiyama K, Kim JY, Marti-Vidal I, Gómez JL, Kawashima T, Yuan F, Ros E, Alef W, Britzen S, Bremer M, Broderick AE, Doi A, Giovannini G, Giroletti M, Ho PTP, Honma M, Hughes DH, Inoue M, Jiang W, Kino M, Koyama S, Lindqvist M, Liu J, Marscher AP, Matsushita S, Nagai H, Rottmann H, Savolainen T, Schuster KF, Shen ZQ, de Vicente P, Walker RC, Yang H, Zensus JA, Algaba JC, Allardi A, Bach U, Berthold R, Bintley D, Byun DY, Casadio C, Chang SH, Chang CC, Chang SC, Chen CC, Chen MT, Chilson R, Chuter TC, Conway J, Crew GB, Dempsey JT, Dornbusch S, Faber A, Friberg P, García JG, Garrido MG, Han CC, Han KC, Hasegawa Y, Herrero-Illana R, Huang YD, Huang CL, Impellizzeri V, Jiang H, Jinchi H, Jung T, Kallunki J, Kirves P, Kimura K, Koay JY, Koch PM, Kramer C, Kraus A, Kubo D, Kuo CY, Li CT, Lin LC, Liu CT, Liu KY, Lo WP, Lu LM, MacDonald N, Martin-Cocher P, Messias H, Meyer-Zhao Z, Minter A, Nair DG, Nishioka H, Norton TJ, Nystrom G, Ogawa H, Oshiro P, Patel NA, Pen UL, Pidopryhora Y, Pradel N, Raffin PA, Rao R, Ruiz I, Sanchez S, Shaw P, Snow W, Sridharan TK, Srinivasan R, Tercero B, Torne P, Traianou E, Wagner J, Walther C, Wei TS, Yang J, Yu CY.   +120 more
europepmc   +1 more source

Baseline-dependent clock offsets in VLBI data analysis. [PDF]

J Geod, 2021
Krásná H, Jaron F, Gruber J, Böhm J, Nothnagel A.   +4 more
europepmc   +1 more source

Optimal VLBI baseline geometry for UT1-UTC Intensive observations. [PDF]

J Geod, 2021
Schartner M, Kern L, Nothnagel A, Böhm J, Soja B.   +4 more
europepmc   +1 more source

Blazar jets imaged with Very Long Baseline Interferometry (VLBI) - kinematics of helical trajectories in 3C273 and 3C345 [PDF]

In this work a large collection of VLBI (Very Long Baseline Interferometry) maps are presented based upon data from the VLBA (Very Long Baseline Array) for 29 sources. The maps are the result of three epochs of imaging. A kinematic study was undertaken with a view to understanding some interesting structure seen in the quasars 3C273 and 3C345 ...
openaire  

Navigational utility of high-precision radio interferometer for Galileo's approach to Jupiter [PDF]

The effect of very long baseline interferometry (VLBI) measurements of 2-nanoradian (nrad) accuracy has been studied for use in Galileo's approach to Jupiter's moon Io.
Folkner, W. M.
core   +1 more source