Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gsfc.reptr....s&link_type=abstract
Semiannual Report National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Brightness, Meteoroid Concentration, Meteoroids, Optical Measurement, Spectral Correlation, Zodiacal Light, Hyperbolic Trajectories, Particulates
Scientific paper
The discovery of the existence of cosmoids, a class of meteoroid in near hyperbolic orbits, was made in a reevaluation of the Sisyphus Experiment on Pioneer 10 and 11. This experiment measured the spontaneous jetting of cosmoids and showed that the dispersion and increase in brightness occurs in microseconds and lasts only briefly. Cosmoid jetting caused multiple telescope thresholds to be exceeded simultaneously which explains the earlier inabilty to compute trajectories from the measured times in the fields of view. A new calculation correlated the Sisyphus individual event measurements with the zodiacal light. That the meteoroid population is dominated by cosmoids is demonstrated. Reported telescopic small comets, measured by a similar optical technique, appear consistent with the Sisyphus results. Characteristic jetting times measured by Sisyphus also show that the volatile cosmoids could not survive in short period orbits.
Dubin Maurice
Soberman Robert K.
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