THE NATURE AND ORIGIN OF OUTER SOLAR SYSTEM ASTEROIDS FROM REFLECTANCE SPECTROPHOTOMETRY (CORONAGRAPH).

Persistent Link:
http://hdl.handle.net/10150/187899
Title:
THE NATURE AND ORIGIN OF OUTER SOLAR SYSTEM ASTEROIDS FROM REFLECTANCE SPECTROPHOTOMETRY (CORONAGRAPH).
Author:
VILAS, FAITH.
Issue Date:
1984
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Narrowband spectrophotometric observations of outer solar system (semi-major axis greater than 3.2 AU) asteroids have been used to investigate the surface compositions of the D- and P-class asteroids in an effort to learn about their origins and formation conditions. Spectra of 20 outer solar system asteroids and 2 main-belt D-class asteroids were obtained using two charge-coupled device (CCD) spectrographs. No mineralogical absorption features were evident. The spectra can be divided into four groups based upon four discrete slopes among the spectra. The slope increases (reddens) with increasing heliocentric distance. All of the asteroids observed are locked in orbits driven by Jupiter's gravitational attraction. The distinct slope changes suggest that these asteroids are the remnants of a gradation in composition of planetesimals in the outer solar system, which were selectively retained in location when other material was lost. Three possible compositions based upon organic polymer materials are discussed. A coronograph/spectrograph was designed to be used with a CCD camera for data acquisition. This instrument can be used for both astronomical imaging and spectrophotometry across the 0.46- to 1.0- μm spectral region. Options to reduce the diffracted light from a telescope and block the light from bright astronomical objects permit high resolution imaging of both bright and faint objects. Direct (1:1) or reducing (2.7:1) imaging is available. Two grisms provide ∼40- Å resolution spectral coverage of the full spectral region. The instrument is modular and easily transported to observing sites.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Asteroids.; Spectrophotometry.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Planetary Sciences; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleTHE NATURE AND ORIGIN OF OUTER SOLAR SYSTEM ASTEROIDS FROM REFLECTANCE SPECTROPHOTOMETRY (CORONAGRAPH).en_US
dc.creatorVILAS, FAITH.en_US
dc.contributor.authorVILAS, FAITH.en_US
dc.date.issued1984en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractNarrowband spectrophotometric observations of outer solar system (semi-major axis greater than 3.2 AU) asteroids have been used to investigate the surface compositions of the D- and P-class asteroids in an effort to learn about their origins and formation conditions. Spectra of 20 outer solar system asteroids and 2 main-belt D-class asteroids were obtained using two charge-coupled device (CCD) spectrographs. No mineralogical absorption features were evident. The spectra can be divided into four groups based upon four discrete slopes among the spectra. The slope increases (reddens) with increasing heliocentric distance. All of the asteroids observed are locked in orbits driven by Jupiter's gravitational attraction. The distinct slope changes suggest that these asteroids are the remnants of a gradation in composition of planetesimals in the outer solar system, which were selectively retained in location when other material was lost. Three possible compositions based upon organic polymer materials are discussed. A coronograph/spectrograph was designed to be used with a CCD camera for data acquisition. This instrument can be used for both astronomical imaging and spectrophotometry across the 0.46- to 1.0- μm spectral region. Options to reduce the diffracted light from a telescope and block the light from bright astronomical objects permit high resolution imaging of both bright and faint objects. Direct (1:1) or reducing (2.7:1) imaging is available. Two grisms provide ∼40- Å resolution spectral coverage of the full spectral region. The instrument is modular and easily transported to observing sites.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectAsteroids.en_US
dc.subjectSpectrophotometry.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlanetary Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.identifier.proquest8506962en_US
dc.identifier.oclc693594963en_US
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