Impact excavation on Asteroid 4 Vesta: Hubble Space Telescope results
Hubble Space Telescope images of asteroid 4 Vesta obtained during the favorable 1996 apparition show an impact crater 460 kilometers in diameter near the south pole. Color measurements within the…
Vesta: Spin Pole, Size, and Shape from HST Images
Abstract HST images obtained over an interval of 71 hr at a scale of 52 km/pixel have been used to determine the spin pole, size, and shape of Vesta. Several bright and dark surface features allow…
Geologic Mapping of Vesta from 1994 Hubble Space Telescope Images
We utilize the 56 images of Asteroid 4 Vesta obtained through four mineralogically diagnostic filters by the Hubble Space Telescope (Zellneret al.1997,Icarus) to construct a geologic map. Vesta's…
Effects of vapor-phase deposition processes on the optical, chemical, and magnetic properties OE the lunar regolith
- B. Hapke, W. Cassidy, E. Wells
- Physics
- 1 July 1975
The processes of solar wind sputtering and meteoritic impact vaporization have created materials in the lunar regolith which were deposited from a vapor phase. Although the quantity of such exotic…
Bidirectional reflectance spectroscopy: 2. Experiments and observations
Certain aspects of the theoretical bidirectional reflectance expression derived by Hapke [this issue] were studied experimentally. The theoretical expression satisfactorily describes the measured…
Mars: Experimental study of albedo changes caused by dust fallout
- E. Wells, J. Veverka, P. Thomas
- Environmental Science, Physics
- 1 June 1984
Far-UV, visible, and near-IR reflectance spectra of frosts of H2O, CO2, NH3 and SO2
- B. Hapke, E. Wells, J. Wagner, W. Partlow
- Physics, Environmental Science
- 1 September 1981
Hubble Space Telescope Images of Asteroid 4 Vesta in 1994
- B. Zellner, R. Albrecht, E. Wells
- Physics
- 1 July 1997
Abstract The Planetary Camera of the WFPC2 on board the Hubble Space Telescope was used in late 1994 to record 56 images of Asteroid 4 Vesta in four compositionally diagnostic wavelength bands. The…
Hubble Space Telescope Astrometric Observations and Orbital Mean Motion Corrections for the Inner Satellites of Neptune
Six small inner satellites of Neptune were imaged in 1989 with Voyager 2. In 1997, we recovered the four outermost with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 for astrometric,…
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