<Li> Data: NSSDC data archive </Li> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="2"> Ultraviolet Photometer </Td> </Tr> <Tr> <Td> </Td> <Td> <P> Ultraviolet light was sensed to determine the quantities of hydrogen and helium in space and on Jupiter . </P> <Ul> <Li> Principal investigator: Darrell Judge / University of Southern California </Li> <Li> Data: PDS / PPI data catalog, NSSDC data archive </Li> </Ul> </Td> </Tr>

Where do sudden changes in pioneer orbit occur