p;experence thtorbtl crossgvery lkelyled close encounterry nd pry syste yoshg， kokubo & mk course ths sttent cnnotsly ppledsyste wth stble orbtl resonnces suchthe neptune–pluto syste
1.2prevous studes ndof ths reserch
ddtonthe vguenessthe conceptstblty， the plsour sr systenbsp;shohrcter typcldyncl chos sussn & wsdonbsp;1988， cuseths chotc behvournow prtly understoodbeesultresonnce oveppg murry & holn 1999; lecr， frnkl & hol，would requre tegrtg overenselery syste cludg ll ne pls foerod coverg severlgyrthoroughly understnd the longternbsp;evolutonry orbts， sce chotc dyncl syste re chrcterzedther strong dependencetl condtons.
fronbsp;tht potvew，of the prevous longternbsp;nurcl tegrtons cluded only the outer fve pls sussn & wsdonbsp;1988; kosht & nkbecuse the orbtl perodsthe outer pls rech lonr thn thosethe ner four pls thtseserfollow the systenbsp;foven tegrto present， the lonst nurcl tegrtons publshedjournls re thoseduncn & lssue thertrt ws the effectpostsequence srlossthe stbltyry orbts， they perfordtegrtons covergto 1011of the orbtl tonsthe four jov tl orbtl elents nd ssespls re thes thoseour sr systenbsp; duncn & lssuer&039;s pper， but they decrese theof the sun grdullyther nurcbecuse they consder the effectpostsequence srlossth， they found tht the crossg tsclery orbts， whch cn typcl dctorthe stblty tscle，qute senstvethe rtess decreseth theof the sunclosets present vlue， the jovn pls re stble over 1010 yr，perhp & lssuer lso perford four sr expertsthe orbtl tonseven pls venusneptune， whch covepn109 yr. ther expertsthe seven pls re not yet prehensve， butsee tht the terrestrl pls lso re stble durg the tegrton perod， tg lst regr osctons.
on the other hnd，hs urte senlytcl secr perturbton theoryskr 1988，skr fds thtr nd rregr vrtons cn pperthe entrctes nd tonsthe terrestrl pls， especllyrcury nd mrs tscleseverl 10sk resultskr&039;s secr perturbton theory shouldconfrd nd vestgtedfully nurcl tegrtons.
ths pperpresent prry resultss