“…The drawback of these approaches using GPS data is that they require sophisticated precise orbit determination techniques or precision orbit ephemeris. Finally, two‐line element data, which is generated using radar and optical tracking data from the United States Space Surveillance Network, has been used by various authors to estimate densities (Cefola et al., 2004; Doornbos et al., 2008; Gondelach & Linares, 2020c; Picone, Emmert, & Lean, 2005; Yurasov et al., 2005). However, due to the limited accuracy and frequency of TLE data, the TLE data of many objects is needed to obtain densities with good accuracy and temporal resolution.…”