Zobrazeno 1 - 10
of 14
pro vyhledávání: '"R. W. Hellings"'
Autor:
C. D. Edwards, R. W. Hellings, C. F. Yoder, Bruce G. Bills, T. M. Eubanks, Robert A. Preston, R. D. Kahn, William M. Folkner, E. M. Standish, James G. Williams
Publikováno v:
Journal of Geophysical Research: Planets. 102:4057-4064
Measurements of Mars' rotational variations can be conducted via Earth-based radio tracking observations of the Mars Pathfinder lander during an extended mission. Two-way range measurements between an Earth tracking station and the lander will enable
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9137dbde688fc2601a292de49361110
https://doi.org/10.1029/96je02125
https://doi.org/10.1029/96je02125
Autor:
J. W. Armstrong, P. R. Saulson, R. W. Hellings, Peter L. Bender, R. W. P. Drever, R. T. Stebbins
A Laser‐Interferometer Gravitational‐Wave Observatory (LIGO) is planned for operation in the United States, with two antennas separated by several thousand kilometers. Each antenna would incorporate laser interferometers with 4 km arm lengths, op
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d79641273885330bf09c71ab9662765c
https://resolver.caltech.edu/CaltechAUTHORS:20151223-133541577
https://resolver.caltech.edu/CaltechAUTHORS:20151223-133541577
Autor:
M.R. Traxler, J. P. Berthias, James K. Campbell, E. L. Lau, Irwin I. Shapiro, R. W. Hellings, James G. Williams, J.A. Dunne, E. L. Akim, J. E. Blamont, John F. Chandler, V. M. Linkin, N.J. Borderies, Jordan Ellis, V. V. Kerzhanovich, Robert D. Reasenberg, John D. Anderson, Robert A. Preston, N. M. Ivanov, C. F. Yoder
Publikováno v:
Advances in Space Research. 9:71-74
A planned experiment to obtain range and Doppler data with the Phobos 2 Lander on the surface of the Martian satellite Phobos is described. With the successful insertion on January 29, 1989 of Phobos 2 into Mars orbit, it is anticipated that the Land
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68541f61225cba67caaabec62509cd93
https://doi.org/10.1016/0273-1177(89)90009-4
https://doi.org/10.1016/0273-1177(89)90009-4
Publikováno v:
Physical Review Letters. 61:1159-1162
New model-independent constraints on possible modifications of Newtonian gravity over solar-system distance scales are presented, and their implications discussed. The constraints arise from the analysis of various planetary astrometric data sets. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::399ab69c95a5def80051427de040fb13
https://doi.org/10.1103/physrevlett.61.1159
https://doi.org/10.1103/physrevlett.61.1159
Autor:
R. W. Hellings, D. C. Backer
Publikováno v:
Annual Review of Astronomy and Astrophysics. 24:537-575
Techniques are described for accounting for relativistic effects in the analysis of pulsar signals. Design features of instrumentation used to achieve millisecond accuracy in the signal measurements are discussed. The accuracy of the data permits mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ac367845a2a57d78092ae854a7e31f5
https://doi.org/10.1146/annurev.aa.24.090186.002541
https://doi.org/10.1146/annurev.aa.24.090186.002541
Autor:
E. K. Lau, John D. Anderson, Frank B. Estabrook, R. W. Hellings, John W. Armstrong, Hugo D. Wahlquist
Publikováno v:
Nature. 308:158-160
Attempts to identify a periodic gravitational wave signal from the binary Geminga in the reduced Doppler data from the Pioneer 10 spacecraft are reported. The study was performed to examine the possibility that the observed 160 min solar oscillation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::979aeaf1f9f65a2971111b7bf0b6227f
https://doi.org/10.1038/308158a0
https://doi.org/10.1038/308158a0
Autor:
R. W. Hellings
Publikováno v:
Gravitational Measurements, Fundamental Metrology and Constants ISBN: 9789401078290
The idea that the Newtonian gravitational constant may vary on cosmic time scales, originally suggested by P.A.M. Dirac, has become a generic prediction of several unified field theories that include gravitation along with the other quantum fields. E
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d915dd5cd1c330fb467cacc439ae7f1
https://doi.org/10.1007/978-94-009-2955-5_13
https://doi.org/10.1007/978-94-009-2955-5_13
Autor:
R. L. Zimmerman, R. W. Hellings
Publikováno v:
The Astrophysical Journal. 241:475
Robertson-Walker cosmologies with matter, radiation, and nonzero cosmological constant are examined to determine how much high-frequency gravitational radiation may be present at the current epoch without violating observations. Evolutionary limits d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15a67f9ed567cbe210c20caeda72d23c
https://doi.org/10.1086/158362
https://doi.org/10.1086/158362
Publikováno v:
The Astrophysical Journal. 318:1
In this paper, the properties of a special class of inhomogeneous cosmological models and the interaction of the inhomogeneities with the evolution of the background geometry and matter are studied. The cosmological model is chosen so that the initia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6cd038025cf5646e9c3ac198236c77c8
https://doi.org/10.1086/165348
https://doi.org/10.1086/165348
Autor:
R. W. Hellings
Publikováno v:
The Astronomical Journal. 91:650
In this paper the relativistic transformations that are necessary to transform the results of earth-based astronomical timing observations from the terrestrial frame in which the observations are made to the proper frame of the astronomical object be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::537068723952780eaff41a1f3e2aabb5
https://doi.org/10.1086/114048
https://doi.org/10.1086/114048