feat: add Lyra constellation module in @observerly/astrometry

observerly · Aug 5, 2024 · bc48c44 · bc48c44
1 parent c91586e
commit bc48c44
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diff --git a/src/constellations.ts b/src/constellations.ts
@@ -65,6 +65,7 @@ export { lepus } from './constellations/lepus'
 export { libra } from './constellations/libra'
 export { lupus } from './constellations/lupus'
 export { lynx } from './constellations/lynx'
+export { lyra } from './constellations/lyra'
 
 /*****************************************************************************************************************/
 

diff --git a/src/constellations/index.ts b/src/constellations/index.ts
@@ -57,5 +57,6 @@ export { lepus } from './lepus'
 export { libra } from './libra'
 export { lupus } from './lupus'
 export { lynx } from './lynx'
+export { lyra } from './lyra'
 
 /*****************************************************************************************************************/
diff --git a/src/constellations/lyra.ts b/src/constellations/lyra.ts
@@ -0,0 +1,98 @@
+/*****************************************************************************************************************/
+
+// @author         Michael Roberts <[email protected]>
+// @package        @observerly/astrometry/lyra
+// @license        Copyright © 2021-2024 observerly
+
+/*****************************************************************************************************************/
+
+import type { EquatorialCoordinate } from '../common'
+
+import { createConstellationAsGeoJSON } from './create'
+
+/*****************************************************************************************************************/
+
+const centrum: EquatorialCoordinate = {
+  ra: 281.805206,
+  dec: 36.773751
+}
+
+/*****************************************************************************************************************/
+
+// prettier-ignore
+const aster: number[][][] = [
+  // Vega to ε¹ Lyrae:
+  [
+    [279.234735, 38.783689],
+    [281.084583, 39.671111]
+  ],
+  // ε¹ Lyrae to ζ¹ Lyrae:
+  [
+    [281.084583, 39.671111],
+    [281.193083, 37.605056]
+  ],
+  // ζ¹ Lyrae to Vega:
+  [
+    [281.193083, 37.605056],
+    [279.234735, 38.783689]
+  ],
+  // ζ¹ Lyrae to δ¹ Lyrae:
+  [
+    [281.193083, 37.605056],
+    [283.431500, 36.971722]
+  ],
+  // δ¹ Lyrae to Sulafat:
+  [
+    [283.431500, 36.971722],
+    [284.735928, 32.689557]
+  ],
+  // Sulafat to β Lyrae:
+  [
+    [284.735928, 32.689557],
+    [282.505000, 33.357222]
+  ],
+  // β Lyrae to ζ¹ Lyrae:
+  [
+    [282.505000, 33.357222],
+    [281.193083, 37.605056]
+  ]
+]
+
+/*****************************************************************************************************************/
+
+// prettier-ignore
+const boundaries: number[][][] = [
+  [
+    [284.277162, 25.664141],
+    [284.269867, 26.164097],
+    [276.762886, 26.074350],
+    [276.700773, 30.073977],
+    [273.824386, 30.039156],
+    [273.466874, 47.536987],
+    [274.342375, 47.547604],
+    [287.120648, 47.699867],
+    [288.375520, 47.714394],
+    [288.470307, 43.714939],
+    [291.983527, 43.755035],
+    [292.119655, 36.755802],
+    [291.492605, 36.748714],
+    [291.598778, 30.249315],
+    [290.095253, 30.232197],
+    [290.132646, 27.732408],
+    [290.161314, 25.732574],
+    [284.277162, 25.664141]
+  ]
+]
+
+/*****************************************************************************************************************/
+
+// https://www.iau.org/public/themes/constellations/#lyr
+export const lyra = createConstellationAsGeoJSON(
+  'Lyra',
+  'the harp (lyre)',
+  centrum,
+  aster,
+  boundaries
+)
+
+/*****************************************************************************************************************/