47 lines
1.7 KiB
Go
47 lines
1.7 KiB
Go
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package moon
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// 外部基准：2017-09-18 轩辕十四掠掩（IOTA 实测 5 段）。内置剖面不保证段数，只钉住主遮挡段与实测最后一段相差不超过 1 s。
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import (
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"math"
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"testing"
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"time"
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"b612.me/astro/moon/limb"
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)
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func TestRegulusGraze20170918MatchesMainObservedInterval(t *testing.T) {
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regulus := StarCoordinate{
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ID: "HIP 49669", RA: 152.09358042, Dec: 11.96719519,
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Epoch: time.Date(1991, time.April, 2, 13, 30, 0, 0, time.UTC), Frame: CoordinateFrameICRS,
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ProperMotionRACosDecMasPerYear: -248.73, ProperMotionDecMasPerYear: 5.59,
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ParallaxMas: 41.13, RadialVelocityKmPerSecond: 6,
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}
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const lon, lat, height = 22.966666666666667, 38.98208333333333, 85
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start := time.Date(2017, time.September, 18, 3, 0, 0, 0, time.UTC)
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events, err := FindStarOccultations(start, start.Add(time.Hour), regulus, lon, lat, height,
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OccultationSearchOptions{LunarLimb: limb.Default()})
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if err != nil || len(events) != 1 {
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t.Fatalf("FindStarOccultations() = %d events, %v; want one", len(events), err)
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}
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profile, err := StarOccultationLimbProfile(events[0], regulus, limb.Default(), StarOccultationLimbProfileOptions{})
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if err != nil {
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t.Fatal(err)
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}
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if len(profile.Hidden) == 0 {
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t.Fatal("graze reports no hidden interval")
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}
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main := profile.Hidden[len(profile.Hidden)-1]
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for _, pair := range []struct {
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name string
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got, observed time.Time
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}{
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{"disappearance", main.Start, time.Date(2017, time.September, 18, 3, 29, 48, 0, time.UTC)},
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{"reappearance", main.End, time.Date(2017, time.September, 18, 3, 30, 2, 950_000_000, time.UTC)},
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} {
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if d := pair.got.Sub(pair.observed).Seconds(); math.Abs(d) > 1 {
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t.Errorf("%s %v is %.2f s from the observed %v", pair.name, pair.got, d, pair.observed)
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}
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}
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}
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