Visual obs'ns show motion of impact sites

Observations just completed, with the 30 cm refractor at Cambridge, showed five sites. Site A is obviously fading, and E,A,C are no longer evenly spaced as they were in the July 17 Hubble image. They transited on July 19 at UT 19.44, 20.23, and 21.31 (+/- 2-3m). Here are our System II longitudes, compared with those reported by Pic du Midi on July 17:

                                     Cambridge     Pic du Midi  Chodas
                                     July 19 pm    July 17 pm   pred.
                                     -----------   ----------   ------
H    Near p. limb                            -
E    Looks exactly like a sat. shadow:      83       75         79
A    Large but faint - has faded:           107      110        107
C    Small dark core? (Lo-res):             148      147        147
K    Large & dark like G yesterday (Lo-res)  -

Seems that E is retrograding. (I will work out System III as well to compare with others' reports, soon.)

Mark Sykes will be pleased to know the 'public involvement' was heavy; we were glad to show the the scars on Jupiter to lots of visitors, though it did compete with serious observations!

John Rogers, with James Lancashire and Jonathan Shanklin.