SOLAR SYSTEM SCIENCE: Enhanced: Two Bodies Are Better than One

The Galileo spacecraft encounters with 951 Gaspra and 243 Ida have provided the first close-up pictures and measurements of asteroids. These two small, S-type asteroids are both irregular in shape, confirming generalized pre-encounter interpretations from groundbased data. Gaspra is lightly cratered by small, fresh craters whereas Ida's surface is heavily covered by craters of all sizes and in all stages of degradation. Unless there are major differences in strength between these two bodies, Ida may be about 10 times older than Gaspra – approaching the age of the solar system. Both asteroids have grooves, although not as prominent as on Phobos. Ida has a population of boulders, particularly near its ends. While Ida seems to have a deep regolith, Gaspra is more nearly in a state of erosion, although there is evidence for an older megaregolith. The data are thus far not conclusive about the geophysical properties of these objects (e.g. whether they are rubble piles) and there are as yet no firm conclusions about how asteroid families are produced by catastrophic collisions. Interesting spectral data relevant to the S-type asteroid controversy (e.g. spatial variations on Gaspra) may lead to some useful generalizations after the remaining Ida data are returned and analyzed in spring 1994. Unexpected magnetic anomalies observed in the vicinities of both asteroids are being studied.

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Solar System Science with Robotic Telescopes

Proceedings of the International Astronomical Union ◽

10.1017/s1743921312001044 ◽

2011 ◽

Vol 7 (S285) ◽

pp. 352-354

Author(s):

T. A. Lister

Keyword(s):

Solar System ◽

Automated System ◽

System Science ◽

Sky Surveys ◽

The Earth ◽

Solar System Objects ◽

Robotic Telescopes ◽

On Line ◽

Near Earth Objects

AbstractAn increasing number of sky surveys is already on-line or soon will be, leading to a large boost in the detection of Solar System objects of all types. For Near-Earth Objects (NEOs) that could potentially hit the Earth, timely follow-up is essential. I describe the development of an automated system which responds to new detections of NEOs from Pan-STARRS and automatically observes them with the LCOGT telescopes. I present results from the first few months of operation, and plans for the future with the 6-site, 40-telescope global LCOGT Network.

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For-the-record aesthetics and Robert Johnson's blues style as a product of recorded culture

Popular Music ◽

10.1017/s0261143007001134 ◽

2006 ◽

Vol 26 (1) ◽

pp. 65-81 ◽

Cited By ~ 5

Author(s):

ERIC W. ROTHENBUHLER

Keyword(s):

Historical Context ◽

The Other ◽

Musical Culture ◽

Professional Musician ◽

The 1960S ◽

The One ◽

Two Bodies ◽

Better Than

Robert Johnson (1911–1938) is the most venerated of all pre-war blues musicians; the veneration borders on hagiography. Recently published revisionist literature has constructed a sociologically realistic portrayal of a professional musician working among other musicians for a contemporary audience in a specific historical context. This has left unexplained, however, the veneration granted to his music by the audience for his records from the 1960s to today. This paper presents the case that these two bodies of fact can be connected and the one serve as an explanation for the other. As Robert Johnson learned his craft from records and radio, and polished his songs to be recorded, he effectively developed a ‘for-the-record’ aesthetic that made his music sound different to that of his Delta contemporaries and many others who used musical techniques honed in performance for an audience. Decades later, when a ‘for-the-record’ aesthetic was the taken-for-granted standard in popular musical culture, Robert Johnson's records sounded better than those of his contemporaries, and the audience from the 1960s to today has had a reason to think that he and his music were special.

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