Observations of the 2010 August and 2012 September impact locations. a) Keck images following the 2010 August 20 impact. The first image was acquired in a strong methane absorption band (2.11 μm) while the second was acquired in a narrow Fe band (1.645 μm). b) Amateur observations in the visible and the strong methane absorption band at 890 nm one Jupiter rotation after the impact. c) IRTF and amateur images obtained following the 2012 September 10 impact. Debris from an impactor should appear dark at visible wavelengths and bright in methane absorption bands in 890 nm and 2.12 μm as well as in 1.645 μm. Circles show the impact location. Neither of these observations succeeded in showing a debris field at the impacts’ locations, implying modest sizes for both objects.