Discovery and naming Themisto was first discovered by PERSON@1 and PERSON@2 on September NUMBER@1 , NUMBER@2 , reported on October NUMBER@3 , 1975IAUC NUMBER@4 : Probable New Satellite of Jupiter NUMBER@2 October NUMBER@3 -LRB- discovery -RRB- and designated .

Discovery and naming Themisto was first found by PERSON@1 and PERSON@2 on September NUMBER@1 , NUMBER@2 , reported on October NUMBER@3 , 1975IAUC NUMBER@4 : Probable New Satellite of Jupiter NUMBER@2 October NUMBER@3 -LRB- discovery -RRB- and designated .
