fix: 🐛 fix getGroundTracks stopping short of antemeridian (#44)

fixes issue #43
davidcalhoun · Oct 27, 2023 · 31a9f54 · 31a9f54
1 parent c0f9dd1
commit 31a9f54
Show file tree

Hide file tree

Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/__tests__/sgp4.js b/__tests__/sgp4.js
@@ -324,7 +324,8 @@ describe("problematic TLES (geosync, decayed)", () => {
 			tle: tleStr,
 			startTimeMS: timestamp
 		});
-		expect(result.length).toEqual(6001);
+		// Time until it reaches the antemeridian
+		expect(result.length).toEqual(172809);
 	});
 
 	test("getGroundTracks", async () => {

diff --git a/src/sgp4.js b/src/sgp4.js
@@ -390,11 +390,13 @@ export async function getOrbitTrack({
 	stepMS = 1000,
 	sleepMS = 0,
 	jobChunkSize = 1000,
-	maxTimeMS = 6000000,
+	maxTimeMS,
 	isLngLatFormat = true
 }) {
 	const { tle: tleArr } = parseTLE(tle);
 
+	maxTimeMS ??= getAverageOrbitTimeMS(tleArr) * 1.5;
+
 	const startS = (startTimeMS / 1000).toFixed();
 	const cacheKey = `${tleArr[0]}-${startS}-${stepMS}-${isLngLatFormat}`;
 	if (cachedOrbitTracks[cacheKey]) {