Here, we present results on the intrinsic collision probabilities, P _I , and range of collision speeds, V _I , as a function of the heliocentric distance, r, in the trans-Neptunian region. The collision speed is one of the parameters that serves as a proxy for a collisional outcome (e.g., disruption and scattering of fragments, or formation of a crater, as both processes are related to the impact energy). We utilize an improved and debiased model of the trans-Neptunian object (TNO) region from the “Outer Solar System Origins Survey” (OSSOS). It provides a well-defined model of TNO orbital distribution, based on multiple opposition observations of more than 1000 bodies. We compute collisional probabilities for the OSSOS models of the main classical, resonant, detached+outer, and scattering TNO populations. The intrinsic collision probabilities and collision speeds are computed using pik’s approach, as revised and modified by Wetherill for noncircular and inclined orbits. The calculations are carried out for each of the dynamical TNO groups, allowing for inter-population collisions as well as collisions within each TNO population, resulting in 28 combinations in total. Our results indicate that collisions in the trans-Neptunian region are possible over a wide range in (r, V _I ) phase space. Although collisions are calculated to happen within r ∼ 20–200 au and V _I ∼ 0.1 km s⁻¹ to as high as V _I ∼ 9 km s⁻¹, most of the collisions are likely to happen at low relative velocities V _I < 1 km s⁻¹ and are dominated by the main classical belt.

在这里，我们展示了内在碰撞概率P _I和碰撞速度范围V _{I 的结果}，作为日心距离r 的函数 ，在跨海王星区域。碰撞速度是代表碰撞结果的参数之一（例如，碎片的破坏和散射，或陨石坑的形成，因为这两个过程都与冲击能量有关）。我们利用来自“外太阳系起源调查”（OSSOS）的跨海王星天体（TNO）区域的改进和去偏差模型。它基于对 1000 多个天体的多次对立观测，提供了定义明确的 TNO 轨道分布模型。我们计算了主要经典、共振、分离+外部和散射 TNO 种群的 OSSOS 模型的碰撞概率。固有碰撞概率和碰撞速度是使用 pik 方法计算的，由 Wetherill 针对非圆形和倾斜轨道进行了修订和修改。对每个动态 TNO 组进行计算，允许种群间碰撞以及每个 TNO 种群内的碰撞，总共产生 28 种组合。我们的结果表明，跨海王星区域的碰撞可能在（[R ，V _我）相空间。尽管计算碰撞发生在r ∼ 20–200 au 和V _I ∼ 0.1 km s ^-1到高达V _I ∼ 9 km s ^{-1 内}，但大多数碰撞可能发生在低相对速度V _I < 1 km s ^-1并以主要经典带为主。