Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326...55h&link_type=abstract
Nature (ISSN 0028-0836), vol. 326, March 5, 1987, p. 55-57. Research supported by the University of Wyoming, University of Minne
Astronomy and Astrophysics
Astronomy
9
Comet Nuclei, Giotto Mission, Halley'S Comet, Infrared Astronomy, Astronomical Models, Cometary Atmospheres, Particle Emission, Plasma Jets, Comets, Halley, Earth-Based Observations, Infrared, Wavelengths, Color, Photometry, Temperature, Emissions, Silicate, Brightness, Comparisions, Jetting, Particles, Composition, Hypotheses, Distribution, Luminosity, Models, Procedure, Imagery, Calculations, Optical Properties, Grains, Clathrate Texture
Scientific paper
The authors present ground based 2 - 23 μm photometry and 10.3 μm imaging of Halley taken within hours of the Giotto spacecraft encounter. The photometry shows a colour temperature of 360K and silicate emission features at 10 and 20 μm, and the image shows jet activity similar to that observed by Giotto, but on a scale of thousands of km. The expected 10 μm surface brightness, based on the particle mass distribution measured by Giotto and assuming solid, spherical grains, is a factor of six lower than the observed value. It is suggested that fluffy particles could remove this discrepancy.
Gehrz Robert D.
Grasdalen Gary L.
Hayward Thomas L.
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