The microwave spectra of the asteroids Pallas, Vesta, and Hygiea

Details The microwave spectra of the asteroids Pallas, Vesta, and Hygiea The microwave spectra of the asteroids Pallas, Vesta, and Hygiea

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..335j&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 335-340.

Astronomy and Astrophysics

Astronomy

13

Black Body Radiation, Brightness Temperature, Microwave Spectra, Vesta Asteroid, Ceres Asteroid, Emission Spectra, Rotating Bodies, Speckle Interferometry, Asteroids, Microwave Methods, Spectra, Pallas, Vesta, Hygiea, Brightness, Wavelengths, Surface, Composition, Dust, Depth, Layers, Emissivity, Comparisons, Astronomy, Earth-Based Observations, Dielectric Properties, Data, Subsurface, Regolith, Emissions

Scientific paper

Microwave observations of Pallas, Vesta, and Hygiea at 2 and 6 cm wavelength yield brightness temperatures that are much lower than would be expected for a rapidly rotating blackbody. An analysis of the wavelength dependence of the observed brightness temperatures shows that, as was found for Ceres, these asteroids may be covered by a layer of material with the physical properties of finely divided dust. Models with layer depths of greater than 6 cm (Pallas), 6 cm (Vesta), and 8 cm (Hygiea) were found to represent well the variation in emissivity at radio wavelengths. The properties of the underlying layer are not well constrained by the microwave observations. It does appear that the real part of the dielectric vector for the substrate is similar to that of basaltic rock. Major compositional changes, if any, must take place at depths greater than about 10 cm. No evidence for water ice was found. Disk-resolved observations of the 2-cm emission of Vesta yield physical dimensions consistent with the recently published speckle-interferometry results.

Affiliated with

Also associated with

No associations

Rating

The microwave spectra of the asteroids Pallas, Vesta, and Hygiea does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The microwave spectra of the asteroids Pallas, Vesta, and Hygiea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The microwave spectra of the asteroids Pallas, Vesta, and Hygiea will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1703487