Fig. 1. Altitude attenuation curve of GRACE-1 satellite with the solar flux data NORAD 27391

Fig. 2. Altitude changes of Tiangong-1 spacecraft with and without control （NORAD 37820）

Fig. 3. Update orbital data frequencies of NORAD for different satellites

Fig. 4. Orbital inclination changes of different satellites before falling into the Earth's atmosphere

Fig. 5. Orbital inclination changes of GRECE-1 and GRECE-2 satellites during their inactive life time and the NUFT results

Fig. 6. NUFT results of the orbital inclination changes of different inactive satellites