Deep space experiment to measure G. (17th May 2016)

• Record Type: Journal Article
• Authors: Feldman, Michael R; Anderson, John D; Schubert, Gerald; Trimble, Virginia; Kopeikin, Sergei M; Lämmerzahl, Claus
• Is Part Of: Classical and quantum gravity. Volume 33:Number 12(2016:Jun.)
• Publication Date: 2016-05-17
• Subjects: experimental studies of gravity -- gravitational constant -- gravity train -- numerical simulation; 0480-y -- 0260Cb; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/0264-9381/33/12/125013
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: Responding to calls from the National Science Foundation for new proposals to measure the gravitational constant G, we offer an interesting experiment in deep space employing the classic gravity train mechanism. Our setup requires three bodies: a larger layered solid sphere with a cylindrical hole through its center, a much smaller retroreflector which will undergo harmonic motion within the hole and a host spacecraft with laser ranging capabilities to measure round trip light-times to the retroreflector but ultimately separated a significant distance away from the sphere-retroreflector apparatus. Measurements of the period of oscillation of the retroreflector in terms of host spacecraft clock time using existing technology could give determinations of G nearly three orders of magnitude more accurate than current measurements here on Earth. However, significant engineering advances in the release mechanism of the apparatus from the host spacecraft will likely be necessary. Issues with regard to the stability of the system are briefly addressed.