Merge remote-tracking branch 'origin/main' into fix/tle-catalog-matching

src/sources/tle.js

@@ -28,8 +28,36 @@ export function parseTleText(text) {
   return result;
 }
 
+/**
+ * The catalog number an Alpha-5 field stands for, or null for any other field.
+ *
+ * Since the catalog passed 99999 (July 2026) a TLE writes the numbers above it
+ * in Alpha-5: a letter A–Z, skipping I and O, stands for 10–33 in the
+ * ten-thousands place, so 100000 is "A0000" and 339999 is "Z9999".
+ */
+function alpha5CatalogNumber(field) {
+  const letter = field[0];
+  if (
+    letter >= 'A' &&
+    letter <= 'Z' &&
+    letter !== 'I' &&
+    letter !== 'O' &&
+    /^\d{4}$/.test(field.slice(1))
+  ) {
+    let tens = letter.charCodeAt(0) - 65 + 10;
+    if (letter > 'I') tens -= 1;
+    if (letter > 'O') tens -= 1;
+    return tens * 10000 + Number(field.slice(1));
+  }
+  return null;
+}
+
 /** The NORAD catalog number from a TLE line, or null. */
 export function tleCatalogNumber(line) {
-  const number = Number.parseInt(String(line).slice(2, 7), 10);
+  const field = String(line).slice(2, 7);
+  const alpha5 = alpha5CatalogNumber(field);
+  if (alpha5 !== null) return alpha5;
+  const number = Number.parseInt(field, 10);
   return Number.isInteger(number) ? number : null;
 }
+