Monday afternoon John Spencer gave a lengthy talk about the New Horizons encounter with Jupiter. I've posted extensively on this in the past: approaching Jupiter; Jupiter rotating; full frame on Jupiter; Jupiter cloud motion; Io erupting; Alice's view; retreating view of Io and Europa; early science results; Europa images; Tvashtar movie; etc, etc, etc. And in fact John Spencer posted here too, about approaching Jupiter and Io's eruptions. So I'll try to keep to things that were new to me.
John went over New Horizons' trajectory to Pluto, and mentioned that during the long cruise they will actually be doing a little bit of science on Uranus and Neptune. New Horizons will be way too far away to resolve either planet, but will be able to measure each planet's brightness at a variety of phase angles. From Earth, we pretty much only see Uranus and Neptune almost fully lit by the Sun (that is, from very low phase angles); New Horizons will get much higher phase views.
He mentioned that the goals for the Jupiter encounter were fourfold. First in importance was the gravity assist; second was for the science team to undergo a stress test ("at this," John remarked, "we were very successful.") Third was to calibrate the instruments; science came in last, but they still managed to accomplish a lot.
He showed some images from the Ralph MVIC multispectral imager that I hadn't seen before. Ralph could not be used much at Jupiter because it was too sensitive for the bright lighting conditions there; the detectors would be totally saturated, even with the shortest possible exposures. But there was an exception: one of the filters is a narrow-band one in a wavelength in which methane strongly absorbs light. Because Jupiter has a lot of methane in its atmosphere, and methane absorbs so much of the light, Ralph was able to capture a 3,000-pixel portrait of Jupiter in this methane band. Turns out the images was released on the mission website in May; I just hadn't noticed it before. Here it is in all its glory.
He discussed the cool Io eclipse images too:
Looking at the famous Tvashtar plume movie:
He noted that all of their temperature measurements indicated that the lavas were likely of ordinary basaltic composition; they see no evidence for higher temperatures requiring exotic lava compositions.
Commenting on the satellite search, he said "We did not find any satellites that we believe yet, down to 1 kilometer in size. But we found something more interesting. We found two ring clumps confined to a narrow bright arc. At first Mark Showalter thought these were collisional remnants from a recent collision, but we do not see them brightening at high phase angle" as they would expect from a collision, which would have produced dust. "So they may be confined arcs like at Neptune or in Cassini's G ring, related to orbital resonances with Metis."