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Atomic clocks for astrophysical measurementsIt is noted that recently developed atomic hydrogen masers have achieved stability well into the 10 to the -16th domain for averaging time intervals beyond 1000 sec and that further improvements are in prospect. These devices are highly adaptable for space use in very high precision measurements of angle through Very Long Baseline Interferometry (VLBI) and of range and range-rate through Doppler techniques. Space missions that will use these clocks for measuring the sun's gravity field distribution and for testing gravitation and relativity (a project that will include a search for pulsed low-frequency gravitational waves) are discussed. Estimates are made of system performance capability, and the accuracy capability of relativistic measurements is evaluated in terms of the results from the 1976 NASA/SAO spaceborne clock test of the Einstein Equivalence Principle.
Document ID
19830046511
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Vessot, R. F. C.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Mattison, E. M.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Instrumentation And Photography
Accession Number
83A27729
Funding Number(s)
CONTRACT_GRANT: NSG-7176
Distribution Limits
Public
Copyright
Other

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