The occultation prediction files are named according to the following scheme: File Occultor Dates ------------------------------------------------------ coi1to3.ps.Z Callisto 970424; 970510; 970510 coi4to6.ps.Z " 970511; 970921; 971007 coi7to9.ps.Z " 971025; 971110; 971127 eoi1to3.ps.Z Europa 970310; 970314; 970317 eoi4to6.ps.Z " 970321; 970324; 970328 eoi7to9.ps.Z " 970401; 970404; 970408 eoi10to12.ps.Z " 970411; 970415; 970418 eoi13to15.ps.Z " 970415; 970425; 970429 eoi16to18.ps.Z " 970503; 970506; 970510 goi1to3.ps.Z Ganymede 970508; 970515; 970522 goi4to6.ps.Z " 970530; 970530; 970531 goi7to9.ps.Z " 970606; 970606; 970607 goi10to12.ps.Z " 970613; 970613; 970614 goi13to15.ps.Z " 970621; 970628; 970705 goi16to18.ps.Z " 970712; 970719; 970726 goi19to21.ps.Z " 970803; 970810; 970817 goi22to24.ps.Z " 970824; 970831*; 970907* goi25to27.ps.Z " 970914*; 970921; 970928 goi28to30.ps.Z " 971005; 971013; 971020 goi31to33.ps.Z " 971027; 971103; 971110 goi34to36.ps.Z " 971117; 971118; 971118 goi37to39.ps.Z " 971124; 971125; 971125 goi40to42.ps.Z " 971202; 971210; 971217 goi43to44.ps.Z " 971224; 971231 *Note that for these events Jupiter intervenes between Io and Ganymede, so the occultations are not observable. Each file typically covers 3 occultations. The numbers are just sequential ID #s for each occultation by satellite and have no significance. Each occultation is labelled with date and minimum separation time for comparison, for example, with Arlot's predicttions. For each occultation, there are 2 images. The left-hand image shows a 1 x 1 degree resolution Voyager Clear-filter Io mosaic (derived from a map made available by A. McEwen) centered on the sub-Earth longitude on Io at the time of minimum separation and the equator (the sub-Earth latitiude is within 3 degrees of the equator). The limb of the occulting satellite in shown as a dotted arc or circle at an early time, a solid circle at minimum separation, and a dashed line at a late time during the occultation. The right-hand image shows the Earth centered at the sub-Io latitude and longitude at the time of minimum separation indicating the viewing geometry from Earth. A companion file, overlay.ps.Z, when printed onto a transparency, overlays the Earth image and shows the locus of airmass=2 as the innermost solid circle, airmass=3 as a dashed circle, airmass=4 as a dotted circle, and airmass=5 as a dot-dashed circle. NOTE: THESE PLOTS ARE INTENDED FOR PLANNING PURPOSES ONLY!!! They contain a few mistakes, e.g. E13 is at E11 time and date and limbs are not right, so let the user beware! But mostly they are correct and fine. I make them available in the best interest of conveying this useful planning information available to the broader community so that the best overall set of observations is acquired. We/I am trying to develop a coordinated set of submissions for telescope time so that: 1) TACs are not overwhelmed with proposals from many different groups for the same event on the same telescope, and 2) the best overall data set is acquired. Please contact me or John Spencer if you are seriously considering applying for time with IR instruments to map Io's hot spot emission and would like to be an integral part of the overall plan. Jay Goguen jdg@scn1.jpl.nasa.gov PS These are based on my independent calculations using PERCY provided by the Nav group at JPL. I am (not they) responsible for any snafus. Times differ by about 1 minute from those in Arlot's advance predicts.