NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Far-UV, visible, and near-IR reflectance spectra of frosts of H2O, CO2, NH3 and SO2Measurements in the 0.1-2.5 micron range are presented for the reflectance spectra of the frosts of several volatiles pertinent to the study of comet nuclei. The frost spectra have distinctive features permitting their identification by spectroscopic reflectance remote sensing, notably in the far UV. It is found that: (1) H2O has a minimum at 0.16 microns and a maximum at 0.13 microns; (2) CO2 has minima near 0.21, 0.18 and 0.125 microns, with maxima at 0.19, 0.135 and 0.120 microns; (3) NH3 is bright at wavelengths longer than 0.21 microns, where reflectance drops to a value of only a few per cent at shorter wavelengths; (4) SO2 has a sharp drop at 0.32 microns, with a minimum at 0.18 microns and a maximum at 0.13 microns. The features in the frost spectra largely correspond to absorption line bands in the gas phase.
Document ID
19820033673
Document Type
Reprint (Version printed in journal)
Authors
Hapke, B. (Pittsburgh Univ. Pittsburgh, PA, United States)
Wells, E. (Pittsburgh Univ. Pittsburgh, PA, United States)
Wagner, J. (Pittsburgh, University Pittsburgh, PA, United States)
Partlow, W. (Westinghouse Research and Development Center Pittsburgh, PA, United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1981
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other