Precision estimation of precession and nutation from radio interferometric observations

Details Precision estimation of precession and nutation from radio interferometric observations Precision estimation of precession and nutation from radio interferometric observations

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..433w&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 3, Aug. 1977, p. 433-440.

Astronomy and Astrophysics

Astronomy

1

Earth Rotation, Nutation, Precession, Radio Astronomy, Radio Interferometers, Astrometry, Error Analysis, Frequency Measurement, Standard Deviation, Time Lag

Scientific paper

The precision of lunisolar precession and nutation terms determined by hypothetical VLBI observations is estimated as a function of radio-source declination, baseline location, and observation time span. The separability of effects on observational data due to precession and nutation is also considered. Results of several case studies performed for a variety of radio-source declinations, baseline locations, and types of observation (i.e., time delay alone or time delay plus fringe frequency) are presented, and the accuracies obtained for each set of conditions are compared. It is concluded that: (1) the accuracy of precession and nutation terms determined by VLBI observations of time delay and fringe frequency over a period of 5 to 10 yr is greater for observations of radio sources with fairly high declinations as opposed to declinations in the equatorial range; (2) a combination of baselines with different declinations gives the most significant accuracy; and (3) terms derived from time-delay and fringe-frequency measurements are more accurate than those obtained from time-delay data alone.

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