76 lines
2.5 KiB
Go
76 lines
2.5 KiB
Go
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package basic
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import (
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"math"
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"testing"
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)
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const galileanSampleToleranceAU = 1e-15
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const galileanSampleToleranceAUDay = 1e-15
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type galileanSample struct {
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name string
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index int
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state JupiterGalileanState
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}
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func TestJupiterGalileanSatelliteStateMatchesIMCCESample(t *testing.T) {
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samples := []galileanSample{
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{
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name: "Io",
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index: 1,
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state: JupiterGalileanState{X: 2.671999370920431e-003, Y: 7.644018403387422e-004, Z: 4.087344808808269e-004, VX: -3.116203340625001e-003, VY: 8.645679572984422e-003, VZ: 4.066210333795641e-003},
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},
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{
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name: "Europa",
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index: 2,
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state: JupiterGalileanState{X: -3.751373844521062e-003, Y: -2.136179970327756e-003, Z: -1.056765216826830e-003, VX: 4.310591732986133e-003, VY: -6.143199976514738e-003, VZ: -2.800434328620005e-003},
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},
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{
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name: "Ganymede",
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index: 3,
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state: JupiterGalileanState{X: -5.490036250442612e-003, Y: -4.112229247907583e-003, Z: -2.033821277493470e-003, VX: 4.036147912130572e-003, VY: -4.364866691392988e-003, VZ: -2.037111499364415e-003},
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},
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{
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name: "Callisto",
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index: 4,
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state: JupiterGalileanState{X: 2.172082907229073e-003, Y: 1.118792302205555e-002, Z: 5.322275059416266e-003, VX: -4.662583658656747e-003, VY: 7.976685330152526e-004, VZ: 3.092058747362411e-004},
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},
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}
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const jd = 2451545.0
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maxPosDiff := 0.0
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maxVelDiff := 0.0
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for _, sample := range samples {
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got := JupiterGalileanSatelliteState(jd, sample.index)
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posDiffs := []float64{
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math.Abs(got.X - sample.state.X),
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math.Abs(got.Y - sample.state.Y),
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math.Abs(got.Z - sample.state.Z),
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}
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velDiffs := []float64{
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math.Abs(got.VX - sample.state.VX),
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math.Abs(got.VY - sample.state.VY),
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math.Abs(got.VZ - sample.state.VZ),
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}
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for i, diff := range posDiffs {
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if diff > maxPosDiff {
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maxPosDiff = diff
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}
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if diff > galileanSampleToleranceAU {
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t.Fatalf("%s position[%d] mismatch: got %.18e want %.18e", sample.name, i, []float64{got.X, got.Y, got.Z}[i], []float64{sample.state.X, sample.state.Y, sample.state.Z}[i])
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}
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}
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for i, diff := range velDiffs {
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if diff > maxVelDiff {
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maxVelDiff = diff
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}
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if diff > galileanSampleToleranceAUDay {
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t.Fatalf("%s velocity[%d] mismatch: got %.18e want %.18e", sample.name, i, []float64{got.VX, got.VY, got.VZ}[i], []float64{sample.state.VX, sample.state.VY, sample.state.VZ}[i])
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}
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}
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}
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// Official IMCCE README example for V1_1 at JD 2451545.0.
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t.Logf("galilean IMCCE sample max diff: position=%.3e AU velocity=%.3e AU/day", maxPosDiff, maxVelDiff)
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}
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