July 18 1994, 04:25 - 05:23 UT
We performed speckle imaging of Jupiter at 550nm (40nm bandwidth)
at the 120" telescope, with a bare CCD camera having 0.063" pixels.
THree very dark black spots were clearly visible at the positions of impacts C, A, E (or perhaps F). Surrounding the dark spots of impacts E and A were dark partial rings or crescents. The spots were about one arc sec in diameter.
THe spot at the position of impact E (or F?) was considerably darker than that at the position of impact A at the time we observed it.
We have also observed the face of Jupiter in a methane filter (8800 A with 300A bandwidth). We saw no clear spots on the face of the planet. When impact site A was coming around the dawn limb, it appeared as a brighter region at the limb and as it rotated into view.
We plan to post some of these processed speckle images under the home page of the Lawrence Livermore National Laboratory at the WWW address http://www.llnl.gov in the "What's New" section.
The dark spots which we saw at 5500A were also seen at Lick by visual observers on the 36 inch refractor, as well as with CCD camera on the 40 inch Nickel telescope (Mike Brown and colleagues).
Claire Max, Don Gavel, Erik Johansson, LLNL Mike Liu, UC Berkeley Bill Bradford, UC Santa Cruz