We present geologic or geographic structures, assumed to be craters of
meteoritic origin, discovered on radar images taken by the X-SAR on
board of the Space Shuttle, during missions carried out in April and
The author has attempted to determine the real frequency of meteoritical
events of megatonic class through a bibliographic search for events that
occurred during the last two centuries. The outcome of this search was
unexpected: (1) megatonic events seem to occur once every ten years; and
(2) the discovery of some presently unknown events. A list of possible
or certain megatonic events is presented.
Antarctic Meteorites XXI. Papers presented to the 21st Symposium on Antarctic Meteorites, NIPR, Tokyo, June 5-7, 1996.
IAUC 6265 available at Central Bureau for Astronomical Telegrams.