In June 2018, after 4 years of cruise, the Japanese space probe Hayabusa2 [1-Watanabe S. et al.: Hayabusa2 Mission Overview. (2017)] reached the Near-Earth Asteroid (162173) Ryugu. Hayabusa2 carried a small Lander named MASCOT (Mobile Asteroid Surface Scout) [2-Ho T. M. et al.: MASCOT-The Mobile Asteroid Surface Scout on-board the Hayabusa2 mission. (2017)], jointly developed by the German Aerospace Center (DLR) and the French Space Agency (CNES), to investigate Ryugu's surface structure, composition and physical properties including its thermal behaviour and magnetization in-situ. The Microgravity User Support Centre (DLR-MUSC) in Cologne was in charge of providing all thermal conditions and constraints necessary for the selection of the final landing site and for the final operations of the Lander MASCOT on the surface of the asteroid Ryugu.

This article provides a comprehensive assessment of these thermal conditions and constraints, based on predictions performed with the Thermal Mathematical Model (TMM) of MASCOT using different asteroid surface thermal models, ephemeris data for approach as well as descent and hopping trajectories, the related operation sequences and scenarios and the possible environmental conditions driven by the Hayabusa2 spacecraft.

A comparison with the real telemetry data confirms the analysis and provides further information about the asteroid characteristics.

2018 年 6 月，经过 4 年的巡航，日本太空探测器 Hayabusa2 [1- Watanabe S. et al. ：Hayabusa2 任务概述。(2017) ] 到达近地小行星 (162173) Ryugu。Hayabusa2 携带一个名为 MASCOT（移动小行星表面侦察机）的小型着陆器 [2- Ho TM等人。： MASCOT-Hayabusa2 任务上的移动小行星表面侦察兵。(2017 )] 由德国航空航天中心 (DLR) 和法国航天局 (CNES) 联合开发，用于研究 Ryugu 的表面结构、成分和物理特性，包括其热行为和原位磁化。位于科隆的微重力用户支持中心 (DLR-MUSC) 负责提供所有必要的热条件和约束，以选择最终着陆点以及着陆器 MASCOT 在小行星 Ryugu 表面的最终操作。

本文基于 MASCOT 的热数学模型 (TMM) 使用不同小行星表面热模型、用于进场的星历数据以及下降和跳跃轨迹、相关操作序列进行的预测，对这些热条件和约束进行了全面评估。由隼鸟2号航天器驱动的情景和可能的环境条件。

与真实遥测数据的比较证实了分析并提供了有关小行星特征的进一步信息。