Chemical Composition of Comets
{'Code': '03020400', 'Directorate': {'Abbreviation': 'MPS', 'LongName': 'Direct For Mathematical & Physical Scien'}, 'Division': {'Abbreviation': 'AST', 'LongName': 'Division Of Astronomical Sciences'}}
{'SignBlockName': 'Vernon Pankonin', 'PO_EMAI': None, 'PO_PHON': None}
The appearance of comet Halley in 1985-1988 opened a new era in                 probing chemical abundances in the early solar nebula with the                  collection of in situ gas samples by the GIOTTO spacecraft.                     Moreover, use of state-of-the-art detectors on large ground-based               telescopes produced high quality spectrophotometric data ideally                suited for determining chemical abundances of the volatile                      component of the comet nucleus.                                                                                                                                 This grant supports the investigation of the abundances of                      volatiles in cometary nuclei.  The ultimate goal is to relate                   these abundances to the environment for forming comets in the                   primitive solar nebula.  The approach is to combine efforts of an               observationalist and a theorist to constrain a chemical model of                a comet coma using high quality ground-based data.  The model                   which incorporates significant chemical and photolytic coma                     processes will be used to derive the abundances of the parent                   species in the nucleus.  From this research the investigators                   hope to derive significant constraints on chemical processes                    which occurred in the coldest regions of the solar nebula 4.5                   billion years ago.
[{'FirstName': 'Mark', 'LastName': 'Allen', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Mark Allen', 'EmailAddress': None, 'NSF_ID': '000166709', 'StartDate': '05/01/1989', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Susan', 'LastName': 'Wyckoff', 'PI_MID_INIT': None, 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Susan Wyckoff', 'EmailAddress': 'wyckoff@asu.edu', 'NSF_ID': '000470715', 'StartDate': '05/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
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[{'Code': '1214', 'Text': 'PLANETARY ASTRONOMY'}, {'Code': '9120', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}]
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