Say I wanted to add a moon around a certain planet. What "coord_func" should I use? I tried "comet_orbit" and "ell_orbit", but they didn't work.
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"ell_orbit" (elliptic orbit) is the default for satellites that have no dedicated orbit function (that is, most of them). What do you mean by "didn't work"? The satellite didn't appear in the right place, or it didn't appear at all?