Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...57...35l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 57, Jan. 1984, p. 35-41.
Astronomy and Astrophysics
Astronomy
15
Asteroids, Far Infrared Radiation, Infrared Astronomy, Planetary Radiation, Radiant Flux Density, Thermal Radiation, Infrared Telescopes, Lunar Soil, Particle Size Distribution, Plancks Constant, Sky Surveys (Astronomy), Asteroids, Astronomy, Observations, Flux, 2 Pallas, 7 Iris, Firsse, 15 Eunomia, 45 Eugenia, Wavelengths, Far Infrared Sky Survey Experiment, Telescopic Observations, Photometry, Thermal Properties, Radiation, Emissions, Comparisons, Catalog
Scientific paper
Broad bandpass flux measurements with effective wavelengths at 20, 27, and 85 microns are presented for four asteroids - 2 Pallas, 7 Iris, 15 Eunomia, and 45 Eugenia. The observations were made during the Far Infrared Sky Survey Experiment with a superfluid helium-cooled telescope flown to exospheric altitudes aboard a sounding rocket. The 20- and 27-micron fluxes are consistent with published 10- and 20-micron photometry. However, the 85-micron fluxes are a factor of 2 to 3 lower than a Planck law extrapolation of the shorter wavelength fluxes. If the thermal radiation from asteroids at these wavelengths is adequately described by graybody emission, as is expected on the basis of models of asteroid radiation discussed in the literature, then the value of emissivity in the 85-micron bandpass is likely to be substantially lower than the 10- to 20-microns value. The decrease in emissivity between 20 and 85 microns suggested for these asteroids is in qualitative agreement with studies, both observational and theoretical, of emissivity of a lunar-type regolith. Fluxes measured at 20 and/or 27 microns are also reported for an additional 16 asteroids.
Levan Paul D.
Price Stephan D.
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