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- W2141418143 abstract "One of the methods, used to link the free Hipparcos referencesystemtotheconventionalextragalacticreferencesys- tem, is the indirect method using the rapidly rotating terrestrial reference system as an intermediary. We solve the Earth orien- tation parameters, referred to the preliminary Hipparcos refer- ence frame H37C, from the observations made by the classical methodsofopticalastrometry(latitudeanduniversaltimevaria- tions) in the interval 1899.7{1992.0. These parameters are then compared with the series of the Earth orientation parameters obtained by VLBI observations (thus referred to extragalactic objects) in the interval 1980.0{1992.0, and from their differ- ences the two angles 0x;0y (out of three) and their annual rates !x;!y are derived. The non-alignment of the terrestrial longitude systems used by optical astrometry and VLBI makes thedeterminationof0z impossible,andthepracticaltestsshow that its obtained rate, !z, is also worthless, very probably due to a mutual drift between the optical astrometry and VLBI ter- restrial systems in longitude. The remaining angles 0x;0yare determinedwithformalstandarderrorsofabout0.9mas(forthe mean epoch of the common observations of VLBI and optical astrometry,1985.25)andtheirrateswiththeaccuracyof0.3mas yr 1 . The necessity of referring these angles to the mean epoch oftheHipparcoscatalog,1991.25(asrequiredbytheHipparcos Science Team) however raises their standard errors to 1.9 mas." @default.
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- W2141418143 date "1997-03-01" @default.
- W2141418143 modified "2023-09-25" @default.
- W2141418143 title "Using the Earth orientation parameters to link the HIPPARCOS and VLBI reference frames." @default.
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