Influence of the Choice of Lunar Gravity Model on Orbit Determination for Lunar Orbiters

Table 11

Influence of degree and order of GRAIL660B model on orbit determination of lunar orbiter.

Lunar gravity model (GRAIL660B)	Orbit position uncertainty (m, RMS)				Orbit position accuracy (m, RMS)
	R	I	C	3D	R	I	C	3D
21 × 21	32.74	88.27	56.26	109.68	8.04	19.12	13.14	24.55
40 × 40	11.45	31.81	19.50	39.02	3.46	10.18	5.80	12.22
70 × 70	4.99	14.94	8.71	18.00	0.86	2.89	1.63	3.43
100 × 100	4.73	14.26	8.30	17.17	0.62	2.12	1.24	2.54
200 × 200	4.72	14.25	8.29	17.15	0.62	2.09	1.25	2.52
300 × 300	4.72	14.25	8.29	17.15	0.63	2.13	1.26	2.55
660 × 660	4.72	14.25	8.29	17.15	0.62	2.09	1.25	2.51