(Aangestuur vanaf Cubewano)
As ’n voorwerp se wentelperiode in ’n volgetalverhouding tot Neptunus s’n is (’n situasie wat ’n middelbarebeweging-resonansie genoem word), kan dit in ’n gesinkroniseerde beweging met die planeet vasgevang raak en sal sy posisie nie versteur word nie, mits hul relatiewe inlynposisies reg is. As ’n voorwerp byvoorbeeld twee keer om die Son wentel vir elke drie omwentelings van Neptunus, en as dit perihelium met Neptunus bereik ’n kwart van ’n wentelbaan van die planeet af, sal Neptunus elke keer in dieselfde relatiewe plek as aan die begin wees wanneer die voorwerp na perihelium terugkeer, want die planeet sou in dieselfde tyd 1+1⁄2 wentelbane voltooi het. Dit is bekend as die 2:3- (of 3:2)-resonansie en stem ooreen met ’n semihoofas van sowat 39,4 AE. Sowat 200 bekende voorwerpe val in dié groep, insluitende Pluto saam met sy mane. Daarom word dié voorwerpe "plutino's" genoem. Baie plutino's, ook Pluto, se wentelbaan kruis dié van Neptunus, maar vanweë hul resonansie kan hulle nooit bots nie. Plutino's het ’n groot wenteleksentrisiteit, wat beteken hulle het nie in hul huidige posisie gevorm nie, maar is eerder deur die migrerende Neptunus lukraak in hul wentelbane gegooi. Volgens IAU-riglyne moet alle plutino's die naam van ’n god van die onderwêreld kry.
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Last edited on 2 Junie 2019, at 23:20