Issue 10 Volume 41 May 16, 2003

orbit-trailing and anti-sunward directions. Model fits specific to this area and comparison with radio OH measurements suggest
greater acceleration here, with V(sub OH) approx. 1.5 times greater at a 10(exp 6) km cometocentric distance than elsewhere
in the coma. We discuss several mechanisms that may have acted within the coma to produce the observed effect.
Author
Hale-Bopp Comet; Radial Distribution; Flow Velocity; Water; Hydroxyl Radicals; Outgassing
20030032948 Arizona State Univ., Tempe, AZ, USA
Microbeam Investigations of Presolar and Early Solar System Materials
Huss, Gary R.; [2003]; 2 pp.; In English
Contract(s)/Grant(s): NAG5-8158; ASU-PVA6552
Report No.(s): ASU-PVA-6552/TE; No Copyright; Avail: CASI; A01, Hardcopy
This grant provided three years of funding to initiate an independent research program in Cosmochemistry at Arizona
State University. Because the new equipment that was installed at ASU took longer than expected to get running, the project
was extended for a fourth year with no additional funding. By the time the funds were expended, we had set up an entirely
new ion microprobe laboratory at ASU, and we have been fully operational for over two years. This laboratory was funded
in almost equal parts by NASA, NSF, and ASU. Papers describing the first results from this new laboratory are being published
now, and the results have been making an impact on the Cosmochemistry community. While this laboratory was being built,
I continued my research program in collaboration with G. J. Wasserburg at Caltech. As equipment became available, I
gradually shifted my research to ASU. Over the lifetime of this grant, my research program resulted in 12 papers and 13
abstracts on topics ranging from presolar grains (2 papers, 3 abstracts), short-lived radionuclides (6 papers, 6 abstracts),
chemical compositions of chondritic materials (3 papers, 3 abstracts), silicon isotopic fractionation (1 abstract), and the oxygen
composition of the Sun (1 paper). The most important results of this period were the discovery of presolar hibonite in a
meteorite residue, the measurement of 26A1 in CAIs from enstatite chondrites, and the measurements of 10Be in type A CAIs
from CV chondrites. All of these results have had a significant impact on research in Cosmochemstry.
Author
Meteoritic Composition; Cosmochemistry; Microbeams; Bibliographies
20030032989 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Measurements of [C I] 9850 A Emission from Comet Hale-Bopp
Oliversen, R. J.; Doane, N.; Scherb, F.; Harris, W. M.; Morgenthaler, J. P.; [2002]; 1 pp.; In English; Copyright; Avail: Other
Sources; Abstract Only
We present quantitative measurements of cometary [C I] 9850 A, emission obtained during observations of comet
Hale-Bopp (C/1995 O1) in 1997 March and April. The observations were carried out using a high-resolution (lambda/Delta
lambda approx. 40,000) Fabry-Perot/CCD spectrometer at the McMath-Pierce solar telescope on Kitt Peak. This forbidden
line, the carbon analog of [O I] 6300 A, is emitted in the radiative decay of C(1D) atoms. In the absence of other sources and
sinks, [C I] 9850 A emission may be used as a direct tracer of CO photodissociation in comets. However, in Hale-Bopp’s large,
dense coma, other processes, such as collisional excitation of ground-state C(3P), dissociative recombination of CO+, and
collisional dissociation of CO and CO2 may produce significant amounts of C(1D). The long C(1D) radiative lifetime (approx.
4000 s) makes collisional de-excitation (quenching) the primary loss mechanism in the inner coma. Thus, a detailed,
self-consistent global model of collisional and photochemical interactions is necessary to fully account for [C I] 9850 A
emission in comet Hale-Bopp.
Author
Hale-Bopp Comet; Gas Dissociation; Photodissociation; Comet Heads; Carbon Monoxide; Carbon Dioxide; Line Spectra
20030033029 Arizona Univ., Tucson, AZ, USA
Preservation and Enhancement of the Spacewatch Data Archives
Larsen, Jeffrey A.; April 24, 2003; 4 pp.; In English
Contract(s)/Grant(s): NAG5-8095; No Copyright; Avail: CASI; A01, Hardcopy
In March of 1998, the asteroid 1997 XF11 was announced to be potentially hazardous after being tracked over 90 days.
A potential two year wait for confirming observations was shortened to under 24 hours because of the existence of archived
photographic prediscovery images. Spacewatch was a pioneer in using CCD scanning and possesses a valuable digital archive
of its scans. Unfortunately these data are aging on magnetic tape and will soon be lost. Since 1990, the Spacewatch project
gathered some 1.5 Terabytes of scan data covering roughly 75,000 degrees of sky to a limiting magnitude of V = 21.5. The
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