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Rayman, M.

Publications and source records attributed to Rayman, M..

13 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2011

Geoscientific Mapping of Vesta by the Dawn Mission

The geologic objectives of the Dawn Mission are to derive Vesta's shape, map the surface geology, understand the geological context and contribute to the determination of the asteroids' origin and evolution. Geomorphology and distribution of surface features will provide evidence for impact cratering, tectonic activity, volcanism, and regolith processes. Spectral measurements of the surface will provide evidence of the compositional characteristics of geological units. Age information, as derived from crater size-frequency distributions, provides the stratigraphic context for the structural and compositional mapping results into the stratigraphic context and thusrevealing the geologic history of Vesta.

lunar mapping↗
NASA NTRS2011

Does Vesta Have Moons?

Previous searches for moons around Vesta have found nothing to an upper limit of 22.5 magnitude, that corresponds to 44 +/- 4 m diameter assuming the same albedo as Vesta. The Dawn mission's approach phase has dedicated satellite search observations consisting of two mosaic sequences bracketing the first observations of a complete rotation of Vesta scheduled for early July, 2011. In addition, we use the approach optical navigation image sequences for initial satellite searches. We will report any findings from these observations, and upper limits of magnitude and size.

McFadden, L. A.↗
NASA NTRS2011

The Impact History of Vesta: New Views from the Dawn Mission

The Dawn mission has completed its Survey and High-Altitude Mapping Orbit (HAMO) phases at Vesta, resulting in 60-70 meter per pixel imaging, high-resolution image-derived topography, and visual and infrared spectral data covering up to approx.50 degrees north latitude (the north pole was in shadow during these mission phases). These data have provided unprecedented views of the south polar impact structure first detected in HST imaging [1], now named Rheasilvia, and in addition hint at the existence of a population of ancient basins. Smaller craters are seen at all stages from fresh to highly-eroded, with some exposing atypically bright or dark material. The morphology of some craters has been strongly influenced by regional slope. Detailed studies of crater morphology are underway. We have begun making crater counts to constrain the relative ages of different regions of the surface, and are working towards developing an absolute cratering chronology for Vesta's surface.

OBrien, D. P.↗
NASA NTRS2001

Experiences in riding a technology roller coaster to deep space

Deep Space 1(DS1) was the first mission of NASA's New Millennium program and was chartered to flight test twelve high-risk, enabling technologies important for future space and Earth science programs on both a fast schedule and a low budget.

DS1 new advanced technologies high-risk low budget↗
NASA NTRS2000

The DS1 Comet Mission

Explore the source record for details and available documents.

Comets Deep Space Missions↗
NASA NTRS2000

The DS1 Comet Mission

Explore the source record for details and available documents.

comets deep space missions DS1↗
NASA NTRS1999

Results from the Deep Space One Technology Validation Mission

Launched on October 25, 1998, Deep Space 1 (DS1) is the first mission of NASA's New Millennium Program, chartered to flight validate high-risk, new technologies important for future space and Earth science programs.

flight validation New Millennium Program Deep Spac↗