Cassini Observes the Active South Pole of Enceladus
- C. Porco, P. Helfenstein, S. Squyres
- Geology, PhysicsScience
- 10 March 2006
The shape of Enceladus suggests a possible intense heating epoch in the past by capture into a 1:4 secondary spin/orbit resonance.
Asteroid Vesta: Spectral Reflectivity and Compositional Implications
- T. McCord, J. Adams, T. Johnson
- Physics, GeologyScience
- 19 June 1970
Comparison with laboratory measurements on meteorites and Apollo 11 samples indicates that the surface of Vesta has a composition very similar to that of certain basaltic achondrites.
Cassini Imaging of Jupiter's Atmosphere, Satellites, and Rings
- C. Porco, R. West, A. Vasavada
- Physics, GeologyScience
- 7 March 2003
Findings on Jupiter's zonal winds, convective storms, low-latitude upper troposphere, polar stratosphere, and northern aurora are reported, including previously unseen emissions arising from Io and Europa in eclipse, and a giant volcanic plume over Io's north pole are described.
Cassini Imaging Science: Instrument Characteristics And Anticipated Scientific Investigations At Saturn
The Cassini Imaging Science Subsystem (ISS) is the highest-resolution two-dimensional imaging device on the Cassini Orbiter and has been designed for investigations of the bodies and phenomena found…
Optical properties of carbonaceous chondrites and their relationship to asteroids
- T. Johnson, F. Fanale
- Geology, Physics
- 10 December 1973
We report diffuse reflectance measurements of nine samples of carbonaceous chondrites (one C1, three C2, four C3, and one C4) and one iron meteorite, Odessa. Measurements were also made of mineral…
Io's heat flow from infrared radiometry: 1983–1993
- G. Veeder, D. Matson, T. Johnson, D. Blaney, J. Goguen
- Physics
- 25 August 1994
We report the following results from a decade of infrared radiometry of Io: (1) The average global heat flow is more than ∼2.5 W m−2, (2) large warm (≤200 K) volcanic regions dominate the global heat…
Iapetus’ geophysics : rotation rate, shape, and equatorial ridge
- J. Castillo‐Rogez, D. Matson, C. Sotin, T. Johnson, J. Lunine, P. Thomas
- Physics, Geology
- 30 March 2007
26Al decay: Heat production and a revised age for Iapetus
- J. Castillo‐Rogez, T. Johnson, M. Lee, N. Turner, D. Matson, J. Lunine
- Physics, Geology
- 1 December 2009
Voyager 2 at Neptune: Imaging Science Results
- B. Smith, L. Soderblom, J. Veverka
- Physics, Environmental ScienceScience
- 15 December 1989
Voyager 2 images of Neptune reveal a windy planet characterized by bright clouds of methane ice suspended in an exceptionally clear atmosphere above a lower deck of hydrogen sulfide or ammonia ices.…
Evidence for a subsurface ocean on Europa
- M. Carr, M. Belton, J. Veverka
- Geology, PhysicsNature
- 22 January 1998
High-resolution Galileo spacecraft images of Europa are presented, in which evidence for mobile ‘icebergs’ is found and the detailed morphology of the terrain strongly supports the presence of liquid water at shallow depths below the surface, either today or at some time in the past.
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