  The paper is a sequel to our previous work (Zhang et al. Phys. Rev. D 103,
062001 (2021)). For proposed geocentric space-based gravitational wave
detectors such as TianQin, gLISA, and GADFLI, the gravity-field disturbances,
i.e., the so called ``orbital noise'', from the Earth-Moon system on the
sensitive intersatellite laser interferometric measurements should be carefully
evaluated and taken into account in the concept studies. Based on TianQin, we
investigate how the effect, in terms of frequency spectra, varies with
different choices of orbital orientations and radii through single-variable
studies, and present the corresponding roll-off frequencies that may set the
lower bounds of the targeted detection bands. The results, including the
special cases of geostationary orbits (gLISA/GADFLI) and repeat orbits, can
provide a useful input to orbit and constellation design for future geocentric
missions.
