arthomnix.dev
Kitten Space Agency mod to load real Artemis II orbit data
1<?xml version="1.0" encoding="utf-8" ?>
2<!-- Add a version of Luna that uses up-to-date lunar ephemerides for Artemis II,
3and a version of the "Earth and Moon" system using our new Luna. -->
4<Patch>
5 <!-- Create a copy of Luna with our new orbital parameters. -->
6 <With Path="/Root/Mod[@Id='Core']/Assets[@RelPath='Astronomicals.xml']">
7 <Copy Path="." From="PlanetaryBody[@Id='Luna']" Pos="Append" />
8 <With Path="PlanetaryBody[@Id='Luna'][2]">
9 <Copy Path="@Id" Pos="Append">_Artemis2</Copy>
10 <With Path="Orbit">
11 <Delete Path="SemiMajorAxis/@Km" />
12 <Delete Path="Inclination/@Degrees" />
13 <Delete Path="LongitudeOfAscendingNode/@Degrees" />
14 <Delete Path="ArgumentOfPeriapsis/@Degrees" />
15 </With>
16 <!-- Based on JPL Horizons state vectors at 2026-04-06 23:00:00
17 (approx Artemis II lunar periapsis time), orbital parameters calculated
18 from state vectors using KSA code -->
19 <Merge Path="Orbit">
20 <Orbit DefinitionFrame="Equatorial">
21 <SemiMajorAxis M="386527231.6716702" />
22 <Inclination Radians="0.4935872303877871" />
23 <Eccentricity Value="0.04777738122899735" />
24 <LongitudeOfAscendingNode Radians="6.211512996532614" />
25 <ArgumentOfPeriapsis Radians="1.4139735506464641" />
26 <TimeAtPeriapsis Seconds="9903893.82626691" />
27 </Orbit>
28 </Merge>
29 </With>
30 </With>
31
32 <!-- Populate our custom systems with the contents of the corresponding default systems,
33 but use our new custom version of Luna. -->
34 <With Path="/Root/Mod[@Id='OemLoader']">
35 <Copy Path="System[@Id='SolLiteArtemis']" From="/Root/Mod[@Id='Core']/System[@Id='SolLite']/*" Pos="Append" />
36 <With Path="System">
37 <Copy Path="DisplayName/@Value" Pos="Append"> (April 2026 lunar ephemerides)</Copy>
38 <Copy Path="LoadFromLibrary[@Id='Luna']/@Id" Pos="Append">_Artemis2</Copy>
39 </With>
40 </With>
41</Patch>