We had great clouds this weekend and completely missed the “three holes in one” triple transit on Jupiter and both occultations of stars by the moon. Since you may have experienced the same frustration, the least I can offer you is a look at the event through the eyes of astrophotographers who were more fortunate.
Notice how stretched out Callisto’s shadow is. That’s because Jupiter’s a three dimensional globe and the shadow lies close to its edge, which curves sharply away from the observer. The curvature distorts the shadow into an oval. You can also see a hint of distortion in Io’s shadow (far right in Rozakis’ image) but it’s not as obvious in part because Io’s shadow is smaller than Callisto’s.
Just because you may have missed the triple transit, don’t let that stop you from enjoying the many individual (and occasional double) shadow transits ahead. For viewers in the Americas an excellent double transit will take place starting at 5:30 a.m. CDT Oct. 17 when Ganymede casts its shadow on Jupiter. Ganymede will be joined by Io’s shadow at 6:57 a.m., and the two will cruise together across the planet’s face until 8:27 a.m.
Thanks Bart and John for sharing your photos!