M
Michael E. Ash
Researcher at Massachusetts Institute of Technology
Publications - 18
Citations - 837
Michael E. Ash is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Radar & Theory of relativity. The author has an hindex of 13, co-authored 18 publications receiving 801 citations.
Papers
More filters
Journal ArticleDOI
Fourth Test of General Relativity: New Radar Result
Irwin I. Shapiro,Michael E. Ash,R. P. Ingalls,W. B. Smith,D. B. Campbell,Rolf B. Dyce,Raymond F. Jurgens,G. H. Pettengill +7 more
TL;DR: In this article, a more stringent test of the predicted relativistic increase in echo times of radio signals sent from Earth and reflected from Mercury and Venus is presented, which is characterized by a parameter $\ensuremath{\lambda}$ which is unity according to general relativity and 0.93 according to recent predictions based on a scalar-tensor theory of gravitation.
Journal ArticleDOI
Fourth test of general relativity: preliminary results.
Irwin I. Shapiro,Gordon H. Pettengill,Michael E. Ash,Melvin L. Stone,W. B. Smith,R. P. Ingalls,Richard A. Brockelman +6 more
Journal ArticleDOI
Astronomical constants and planetary ephemerides deduced from radar and optical observations
Journal ArticleDOI
Mercury's perihelion advance - Determination by radar.
Irwin I. Shapiro,Gordon H. Pettengill,Michael E. Ash,R. P. Ingalls,D. B. Campbell,R. B. Dyce +5 more
TL;DR: In this article, the echo delays of radar signals transmitted from earth to Mercury were measured, yielding an accurate value for the advance of the latter's perihelion position, given that the sun's gravitational quadrupole moment is negligible, the result in terms of the Eddington-Robertson parameters is (2 + 2 gamma-beta)/3 approximately equal to 1.005 plus or minus 0.02.