Fig. 3

Comparison of the positions of the CE-3 lander from various studies. The orange triangle refers to the position determined by combining fourteen images taken by the Narrow Angle Camera of the LRO (Liu et al. 2015a). The blue square depicts the coordinates obtained through the use of VLBI and UXB measurements (Li et al. 2014). In both cases, the associated position errors (20 m and 50 m) correspond to the uncertainties stated in Liu et al. (2015a) and Li et al. (2014). The pink dots along with the 1-\(\sigma\) position error ellipses depict the results obtained from the individual OCEL sessions used in this study. The red dot (with the 1-\(\sigma\) error ellipse) represents the weighted mean position of the lander based upon OCEL08 and OCEL09