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首页> 外文期刊>Planetary and space science >Orbital evolution of the BepiColombo Mercury Planetary Orbiter (MPO) in the gravity field of Mercury
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Orbital evolution of the BepiColombo Mercury Planetary Orbiter (MPO) in the gravity field of Mercury

机译：汞的重力场中Bepicolombo Mercury行星轨道（MPO）的轨道演变

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We assessed the impact of the uncertainties in the gravity field harmonic coefficients of Mercury on the orbital evolution of the Mercury Planetary Orbiter (MPO), part of the European-Japanese BepiColombo mission. We used in our simulations the most recent estimation of the gravity field model of Mercury determined from radio tracking data of the NASA spacecraft MESSENGER. Thereby we propagated the orbital evolution of MPO by means of plausible gravity fields compatible with the covariance matrix measured gravity field coefficients. We considered two scenarios: 1) the optimistic case, where the formal errors were considered plausible, i.e. scaled by 1; and 2) the conservative case where the formal errors were scaled with a factor of 3. With our simulations we could also demonstrate the importance of the correlation between the errors of the gravity field coefficients for the uncertainty in the trajectory evolution.As the altitude of the spacecraft above the surface is most important in Mercury's harsh thermal environment, we mostly focused our analysis on the evolution of the periherm altitude. The results of the MPO orbit propagation show a non-linear decrease in the periherm altitude over the simulated timeframe of 1000 days. However, the decrease rate varies significantly among the generated gravity fields. Moreover, the dispersion of the periherm altitude gets larger with increasing scale factor (optimistic to conservative scenario) and over the mission time. While the values of the orbital elements of MPO are still in an acceptable range after the first year, the periherm altitude may fall below a critical value of 200 km after 2 years in orbit about Mercury.
机译：我们评估了不确定性在汞行星轨道（MPO）的轨道演变中的重力场谐波系数（MPO）的影响，部分欧洲日本贝帕索罗马博任务。我们用于我们的模拟中最近估计的汞的重力场模型从美国宇航局航天器信使的无线电跟踪数据确定。因此，我们通过与协方差矩阵测量的重力场系数兼容的合理的重力场来传播MPO的轨道演化。我们考虑了两种情况：1）乐观的情况，正式错误被认为是合理的，即缩放1; 2）保守情况，正式错误的缩放为3.与我们的模拟，我们还可以证明在轨迹演化中的不确定性的重力场系数之间的相关性的重要性。表面上方的航天器在汞的苛刻热环境中最重要，我们主要集中了我们对细胞患者高度的演变的分析。 MPO轨道传播的结果显示了在1000天的模拟时间框架上的细胞间高度的非线性下降。然而，在生成的重力场中，降低速率显着变化。此外，利斯姆高度的分散变大，随着规模因素（乐观的保守场景）和在任务时间上，越来越大。虽然MPO的轨道元素的值仍处于第一年后仍处于可接受的范围，但在汞轨道2年后，临时高度可能低于200公里的临界值。

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