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

Table 10

Influence of degree and order of GRAIL420A model on orbit determination of lunar orbiter.

Lunar gravity model (GRAIL420A)	Orbit position uncertainty (m, RMS)				Orbit position accuracy (m, RMS)
	R	I	C	3D	R	I	C	3D
21 × 21	32.73	88.27	56.26	109.67	7.97	19.12	13.20	24.56
40 × 40	11.45	31.81	19.50	39.02	3.46	10.16	5.79	12.19
70 × 70	4.99	14.94	8.71	18.00	0.86	2.88	1.61	3.41
100 × 100	4.73	14.26	8.30	17.17	0.61	2.10	1.24	2.52
200 × 200	4.72	14.25	8.29	17.15	0.62	2.08	1.23	2.50
300 × 300	4.72	14.25	8.29	17.15	0.62	2.08	1.22	2.49
420 × 420	4.72	14.25	8.29	17.15	0.62	2.08	1.23	2.50