I have just received a report from a participant in the amateur
program JCW (Jupiter Comet Watch) indicating an amplitude increase
in the satellite IO during the period of the fragment V impact.
The observer (Lonnie R. McCollister, Cedar Rapids, Ia.) located in Estes Park, Colorado employed a 8" SCT telescope with an ST6 CCD Camera atteached, managed to obtain several 1-second exposures of the moon IO. The timing for the exposures was coordinated with the GPS satellite signal. Filtration used was a red filter (no number was indicated), plus an IR blocking filter. The report further indicates that images of Jupiter and IO were performed to create a baseline (more details can be discussed with the observer).
His observations were as follows: all dates are for 22 July, 1994 and are in UT, and are for amplitudes of IO during that period.
04:15:55UT (6.57), 04:16:44 (6.39), 04:17:33 (6.51), 04:18:22 (6.48), 04:19:11 (6.49), 04:20:20 (6.55), 04:20:49 (6.48), 04:21:37 (6.52), 04:22:26 (6.46), 04:23:14 (6.49), 04:24:02 (6.47), 04:24:51 (6.53), 04:25:39 (6.61), 04:26:27 (6.64), 04:27:16 (6.59). excuse! the bracketed numbers are the magnitudes. (I am a victim here of FPHJ First Post Heebie Jeebies!). The magnitudes system are unknown at this time, however the program SBTG CCD OPS was used for the photometric measurements. I can forward a contact address....
Of particular interest are the first three observational photo's where a definite amplitude variation is noted (0.18).
Steve