Results 151 to 160 of about 256 (175)

Precise radio astrometry and new developments for the next generation of instruments [PDF]

Astronomy and Astrophysics Review, 2020
We present a technique-led review of the progression of precise radio astrometry, from the first demonstrations, half a century ago, until to date and into the future. We cover the developments that have been fundamental to allow high accuracy and precision astrometry to be regularly achieved. We review the opportunities provided by the next-generation
Richard Dodson, María Rioja
exaly   +3 more sources

Microarcsecond Radio Astrometry [PDF]

Annual Review of Astronomy and Astrophysics, 2014
Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate the size, luminosity, mass, and ages of most objects.
Reid, M. J., Honma, M.
exaly   +3 more sources

Optical astrometry of Benchmark radio sources [PDF]

Astronomy and Astrophysics, 1997
Optical positions relative to the International Reference Stars Catalogue (IRS), and therefore in the sys- tem of the FK5, have been obtained for the optical coun- terparts of 40 compact extragalactic radio sources south of +6. Many of these sources are being consid- ered as possible Benchmark objects for the establishment of a quasi inertial unied ...
Enrico Costa
exaly   +2 more sources

Radio astrometry with chromatic AGN core positions [PDF]

Astronomy and Astrophysics, 2009
Accepted for publication in Astronomy & Astrophysics, 4 ...
exaly   +3 more sources

Astrometry and geodesy with radio interferometry: experiments, models, results [PDF]

Reviews of Modern Physics, 1998
83 pages, 19 Postscript figures. To be published in Rev. Mod. Phys., Vol.
Christopher Jacobs, Ojars J Sovers
exaly   +3 more sources

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Astrometry with Radio Interferometers

2000
This chapter summarizes the principles and tools of radio astronomy that ultimately lead to the establishment of a fundamental catalogue via application of the technique of radio interferometry to the measurement of positions of sources at cosmological distances.
Hans G. Walter, Ojars J. Sovers
openaire   +1 more source

Review of radio astrometry I. Radio measurements

International Astronomical Union Colloquium, 1978
At the astrometry symposium held at Perth in 1973, the radio astronomers devoted much of their allocated time towards explaining the techniques used in radio astrometry. As further details are available in, for example, the review by Counselman, it now seems appropriate to consider the achievements that have been made since the last symposium.
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The Application of Radio Interferometers in Astrometry

International Astronomical Union Colloquium, 1975
AbstractAn account is given of the recent precision measurements of position of radio sources by VLBI and especially phase-stable interferometer systems of the 5 km radio telescope in Cambridge.A brief description of the 5 km. telescope is given as well as some of the remarkably accurate determinations of declination and right ascension of radio ...
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Review of radio astrometry II. Optical measurements

International Astronomical Union Colloquium, 1978
The establishment of an astronomical reference frame which is based on positions of extragalactic objects is an old problem of fundamental astronomy. Radio astrometry has now achieved a level of accuracy, which rivals the best optical work, thus openingexcitingprospects to reach this aim within a relatively short time scale.To take full advantage of ...
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Present status of radio astrometry with baselines ≤ 35 km

International Astronomical Union Colloquium, 1978
A summary of results for radio astrometry with baselines ≤ 35 km and priorities for future work are given.
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