两个可能存在大质量类冥王星的区域

1992年以来，在海王星外的太阳系发现了近千个小天体，称为Kuiper带天体(KBO)或Edgeworth—Kuiper带天体，其中有一部分偏心率和倾角较大的小天体与海王星之间存在3：2平运动共振，轨道特征类似冥王星，命名为类冥王星，自KBO发现以来，天文学家们进行了多次小天区的搜索，发现了几个质量较大的KBO，通过数值计算，在轨道参数空间发现了两个和冥王星一样同时具有3种共振的区域，在这两个区域里的小天体既避免了海王星的强摄动又不会与冥王星密切交会，轨道非常稳定，因此有可能在其中发现质量较大的类冥王星。

Two Regions where Plutinos With Larger Masses Might Exist

Up to now near 1000 small objects have been found beyond Neptune. They are called Kuiper Belt Objects (KB Os) or Edgeworth-Kuiper Belt Objects. A group of KBOs named Plutino are in the 3 : 2 mean motion resonance with Neptune and Pluto is one of them. Since the discovery of the first KBO in 1992, several narrow-field surveys have been carried out and a few large KBOs discovered. We found two regions in the space of orbit elememts by numerical experiements, in which objects are trapped in the three resonances just as Pluto does. These resonances protect Pluto and Plutinos from the perturbation of Neptune. Furthermore, minor bodies in these two regions could avoid close encounter with Pluto as well. Consequently, astronomers might find Plutinos with larger masses in these two regions.