Results 21 to 30 of about 909 (203)

RADIO ASTROMETRY OF THE CLOSE ACTIVE BINARY HR 5110 [PDF]

The Astrophysical Journal, 2015
The close active binary HR 5110 was observed at six epochs over 26 days using a global VLBI array at 15.4~GHz. We used phase-referencing to determine the position of the radio centroid at each epoch with an uncertainty significantly smaller than the component separation.
Abbuhl, E., Mutel, R., Lynch, Christene, Gï Edel, M.   +3 more
openaire   +4 more sources

Autonomous control of a prototype solar‐powered offshore autonomous underwater vehicle servicing platform via a low‐cost embedded architecture

Journal of Field Robotics, Volume 40, Issue 4, Page 828-847, June 2023., 2023
Abstract This paper describes the design, implementation, and field‐testing of a low‐cost autonomous control system on the Platform for Expanding Autonomous Underwater Vehicles (AUV) exploRation to Longer ranges (PEARL). PEARL is a floating, solar‐powered platform designed as a servicing station for AUVs.
Ethan S. Rolland, Maha N. Haji, Olivier L. de Weck   +2 more
wiley   +1 more source

Radio Astrometry [PDF]

Symposium - International Astronomical Union, 1984
Radio astrometry is now the premier astrometric technique for measuring the positions of celestial objects. The precision with which absolute positions can be determined is approaching a few milliarc-seconds. The progress towards establishing an almost inertial reference frame based upon the positions of extragalactic radio sources is reviewed as of ...
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, V. A. Fomin, Yu K. Zverev, M. G. Mingaliev, V. N. L'Vov, A. A. Pozhalov   +5 more
openaire   +1 more source

Baseline Vector Repeatability at the Sub‐Millimeter Level Enabled by Radio Interferometer Phase Delays of Intra‐Site Baselines

Journal of Geophysical Research: Solid Earth, Volume 128, Issue 3, March 2023., 2023
Abstract We report the results of position ties for short baselines at eight geodetic sites based on phase delays that are extracted from global geodetic very‐long‐baseline interferometry (VLBI) observations rather than dedicated short‐baseline experiments.
Ming H. Xu, Tuomas Savolainen, Sergei Bolotin, Simone Bernhart, Christian Plötz, Rüdiger Haas, Eskil Varenius, Guangli Wang, Jamie McCallum, Robert Heinkelmann, Susanne Lunz, Harald Schuh, Nataliya Zubko, Niko Kareinen   +13 more
wiley   +1 more source

Photographic astrometry of radio stars [PDF]

Monthly Notices of the Royal Astronomical Society, 1991
Photographic astrometry of four radio stars has been carried out in a test program using the Wide Field Camera at the f/8 focus of the Jacobus Kapteyn Telescope (JKT). The accuracy of the positions is 0.04 arcsec. Comparisons are made with positions obtained by the Carlsberg and Bordeaux automatic meridian circles and with the radio positions measured ...
R. W. Argyle, L. V. Morrison, M. J. Irwin, P. S. Bunclark   +3 more
openaire   +1 more source

Optical and radio astrometry of the galaxy associated with FRB 150418 [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2016
Abstract A fading radio source, coincident in time and position with the fast radio burst FRB 150418, has been associated with the galaxy WISE J071634.59−190039.2. Subsequent observations of this galaxy have revealed that it contains a persistent, but variable, radio source. We present e-Multi-Element Radio Linked Interferometer Network,
Bassa, C. G., Beswick, R., Tingay, S. J., Keane, E. F., Bhandari, S., Johnston, S., Totani, T., Tominaga, N., Yasuda, N., Stappers, B. W., Barr, E. D., Kramer, M., Possenti, A.   +12 more
openaire   +6 more sources

Radio and Optical Astrometry [PDF]

Symposium - International Astronomical Union, 1974
Radio positional measurements have achieved an accuracy as high as that of optical astrometry, with uncertainties no greater than a few hundredths of an arc second in each coordinate. Declinations and relative right ascensions are determined absolutely.
openaire   +1 more source

VLBI astrometry on the white dwarf pulsar AR Scorpii [PDF]

, 2023
AR Scorpii (AR Sco), the only-known radio-pulsing white dwarf binary, shows unusual pulsating emission at the radio, infrared, optical, and ultraviolet bands.
Cao, Hongmin, Liu, Xiang, Jiang, Pengfei, Cui, Lang, Weston, Stuart, An, Tao, Yang, Jun, Li, Guanghui, Xia, Bo, Xu, Shuangjing, Gulyaev, Sergei, Zhang, Bo, Chen, Wen, Jiang, Wu, Shu, Fengchun   +14 more
core   +1 more source

S˜ìvÑRALS : outhern hemisphere parallax interferometric radio astrometry legacy survey

, 2021
The exact structure of the spiral arms of our home Galaxy, the Milky Way, is an unknown that can be resolved by a higher sampling of parallaxes to high mass star-forming regions from both the Northern and Southern Hemispheres. The Northern Hemisphere has
Lucas Hyland (14739874)
core   +1 more source