▁Astronom y ▁at ▁the ▁University ▁of ▁Hawai i , ▁he ▁was ▁cred ited ▁with ▁the ▁discovery ▁of ▁many ▁small ▁mo ons ▁of ▁Jup iter , ▁Sat urn , ▁U ran us , ▁and ▁Ne pt une . ▁He ▁has ▁also ▁discovered ▁the ▁first ▁known ▁trailing ▁Ne pt une ▁tro jan , ▁, ▁the ▁first ▁named ▁leading ▁Ne pt une ▁tro jan , ▁ 3 8 5 5 7 1   O tr era , ▁and ▁the ▁first ▁high ▁incl ination ▁Ne pt une ▁tro jan , ▁. ▁These ▁discover ies ▁showed ▁that ▁the ▁Ne pt une ▁tro jan ▁objects ▁are ▁mostly ▁on ▁highly ▁incl ined ▁or bits ▁and ▁thus ▁likely ▁captured ▁small ▁bodies ▁from ▁elsewhere ▁in ▁the ▁Sol ar ▁System . ▁ ▁The ▁main - b elt ▁astero id ▁ 1 7 8 9 8 ▁Scot ts he pp ard , ▁discovered ▁by ▁L ONE OS ▁at ▁Anderson ▁M esa ▁Station ▁in ▁ 1 9 9 9 , ▁was ▁named ▁in ▁his ▁honor . ▁ ▁Disc over ies ▁▁ ▁She pp ard ▁was ▁the ▁lead ▁discover er ▁of ▁the ▁object ▁with ▁the ▁most ▁distant ▁orbit ▁known ▁in ▁the ▁Sol ar ▁System , ▁ ▁( nick named ▁B iden ). ▁In ▁ 2 0 1 4 , ▁the ▁similarity ▁of ▁the ▁orbit ▁of ▁ ▁to ▁other ▁extreme ▁K ui per ▁bel t ▁object ▁or bits ▁led ▁She pp ard ▁and ▁Tru j illo ▁to ▁propose ▁that ▁an ▁unknown ▁Super - E arth ▁mass ▁planet ▁( 2 – 1 5 ▁Earth ▁masses ) ▁in ▁the