Zobrazeno 1 - 10
of 26
pro vyhledávání: '"W. L. SJOGREN"'
Publikováno v:
Journal of Geophysical Research: Planets. 104:5921-5931
The equipotential surface hypothesis suggests that lunar maria floors lie on a surface parallel to the selenoid. This is examined using the spherical harmonic representations of the Clementine topography and Lunar Prospector gravity data. It is demon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a28abfb6f999724cde484496cb1edf3
https://doi.org/10.1029/1998je900045
https://doi.org/10.1029/1998je900045
Publikováno v:
Science. 276:1236-1239
Doppler data generated with the Galileo spacecraft’s radio carrier wave during two Europa encounters on 19 December 1996 (E4) and 20 February 1997 (E6) were used to measure Europa’s external gravitational field. The measurements indicate that Eur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3655ff9bcc9873a9a12a72b1c71f54c9
https://doi.org/10.1126/science.276.5316.1236
https://doi.org/10.1126/science.276.5316.1236
Publikováno v:
Journal of Geophysical Research: Planets. 98:9113-9128
A new gravity field determination that has been produced combines both the Pioneer Venus Orbiter (PVO) and the Magellan Doppler radio data. Comparisonsbetween this estimate, a spherical harmonic model of degree and order 21, and previous models show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67b98def5eef0ac3b7f563c418ce72dc
https://doi.org/10.1029/93je00382
https://doi.org/10.1029/93je00382
Publikováno v:
Geophysical Research Letters. 17:1485-1488
Reductions of four independent blocks of Pioneer Venus Orbiter Doppler radio tracking data have produced very consistent determinations of the GM of Venus (the product of the universal gravitational constant and total mass of Venus). These estimates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ff0b656be839f6a1cd07834e5e4f428
https://doi.org/10.1029/gl017i010p01485
https://doi.org/10.1029/gl017i010p01485
Autor:
Alexander S. Konopliv, Frank G. Lemoine, W. L. Sjogren, David E. Smith, G. L. Tyler, Georges Balmino
Publikováno v:
Science (New York, N.Y.). 286(5437)
Observations of the gravity field of Mars reveal a planet that has responded differently in its northern and southern hemispheres to major impacts and volcanic processes. The rough, elevated southern hemisphere has a relatively featureless gravitatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e66af047fb51a5c94cadaf9138cd921d
https://pubmed.ncbi.nlm.nih.gov/10506567
https://pubmed.ncbi.nlm.nih.gov/10506567
Publikováno v:
Science (New York, N.Y.). 281(5385)
Radio Doppler data from four encounters of the Galileo spacecraft with the jovian moon Europa have been used to refine models of Europa's interior. Europa is most likely differentiated into a metallic core surrounded by a rock mantle and a water ice-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7108c6ae132ef29d8e8153fc0cd75b81
https://pubmed.ncbi.nlm.nih.gov/9748159
https://pubmed.ncbi.nlm.nih.gov/9748159
Autor:
Gerald Schubert, William B. Moore, E. L. Lau, R. A. Jacobson, John D. Anderson, W. L. Sjogren
Publikováno v:
Science (New York, N.Y.). 280(5369)
Radio Doppler data from a single encounter (C3) of the Galileo spacecraft with Callisto, the outermost Galilean moon of Jupiter, indicated that Callisto was probably undifferentiated. Now, similar data from a second encounter (C9) corroborate this co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::efc11f5015d6cdeb00c13d7a4038be0f
https://pubmed.ncbi.nlm.nih.gov/9616114
https://pubmed.ncbi.nlm.nih.gov/9616114
Autor:
Slava G. Turyshev, Sami W. Asmar, Gerald Schubert, Alex S. Konopliv, Eunice L. Lau, Michael K. Bird, W. L. Sjogren, T. P. Krisher, John D. Anderson
We review the results from {\it Mariner 10} regarding Mercury's gravity field and the results from radar ranging regarding topography. We discuss the implications of improving these results, including a determination of the polar component, as well a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43d46ea308b20ee5800a02c7c06aa700
Autor:
A. I. Zakharov, Patricia G. Rogers, V. A. Stepanyantz, Tim R. Colvin, W. L. Sjogren, P. W. Chodas, E. L. Akim, Z. P. Vlasova, Merton E. Davies
Publikováno v:
Journal of Geophysical Research. 97:13141
Three related activities that use Magellan data to derive improved estimates of the rotation period and direction of the spin axis of Venus are discussed. These are the computation of the Magellan geodetic control network, the use of measurement land
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::694f34db0eb0001525b64494e741e2d2
https://doi.org/10.1029/92je01166
https://doi.org/10.1029/92je01166