We  investigated the retrieval of atmospheric mass densities in lower  thermosphere below 200 km from precise orbit of re-entry object CZ-3B  R/B by analytical and numerical methods. The operation flows of  analytical and numerical methods to retrieve atmospheric mass densities  in lower thermosphere below 200 km from precise orbit of re-entry object  are given. Settingthe time-span as one minute, the atmospheric mass  densities in lower thermosphere below 200 km are successfully retrieved  from the rebuilt precise orbit of re-entry object CZ-3B R/B, and the  specific retrieval results are obtained. The retrieved atmospheric mass  densities have relatively high time resolution.

 The  retrieval of atmospheric mass densities in lower thermosphere below 200  km from precise orbit of re-entry object is verified to be valid. It is  a feasible approach to acquire knowledge and understanding of  atmospheric mass densities in lower thermosphere below 200 km.

 This  work by Ming-Jiang Zhang, Hong-Bo Wang, Chang-Yin Zhao, Jian-Ning  Xiong, Dong Wei, Wei Zhangand Sheng-Xian Yu has been published in  Astrophysics and Space Science. Vol.363 No.8

 Please see the link for more details:

 https://link.springer.com/article/10.1007/s10509-018-3396-9