diff --git a/src/coordinate/Tle.ts b/src/coordinate/Tle.ts
index a5e81db..e6fe5ff 100644
--- a/src/coordinate/Tle.ts
+++ b/src/coordinate/Tle.ts
@@ -563,7 +563,12 @@ export class Tle {
    * @returns The International Designator.
    */
   static intlDes(tleLine1: TleLine1): string {
-    return tleLine1.substring(Tle.intlDes_.start, Tle.intlDes_.stop).trim();
+    const year2 = this.intlDesYear(tleLine1);
+    const year4 = year2 < 57 ? year2 + 2000 : year2 + 1900;
+    const launchNum = this.intlDesLaunchNum(tleLine1);
+    const launchPiece = this.intlDesLaunchPiece(tleLine1);
+
+    return `${year4}-${launchNum.toString().padStart(3, '0')}${launchPiece}`;
   }
 
   /**
diff --git a/test/objects/__snapshots__/Satellite.test.ts.snap b/test/objects/__snapshots__/Satellite.test.ts.snap
index 9924072..15599c7 100644
--- a/test/objects/__snapshots__/Satellite.test.ts.snap
+++ b/test/objects/__snapshots__/Satellite.test.ts.snap
@@ -103,7 +103,7 @@ Satellite {
   "epochYear": 22,
   "id": -1,
   "inclination": 51.6415,
-  "intlDes": "98067A",
+  "intlDes": "1998-067A",
   "meanAnomaly": 54.7009,
   "meanMoDev1": 0.00003068,
   "meanMoDev2": 0,
diff --git a/test/tle/tleData.ts b/test/tle/tleData.ts
index ac4ea99..f9802b1 100644
--- a/test/tle/tleData.ts
+++ b/test/tle/tleData.ts
@@ -9,7 +9,7 @@ export const tleData = [
     satNum: 25544,
     satNumRaw: '25544',
     classification: 'U',
-    intlDes: '98067A',
+    intlDes: '1998-067A',
     intlDesYear: 98,
     intlDesLaunchNum: 67,
     intlDesLaunchPiece: 'A',
@@ -42,7 +42,7 @@ export const tleData = [
     satNum: 25544,
     satNumRaw: '25544',
     classification: 'U',
-    intlDes: '98067A',
+    intlDes: '1998-067A',
     intlDesYear: 98,
     intlDesLaunchNum: 67,
     intlDesLaunchPiece: 'A',
@@ -76,7 +76,7 @@ export const tleData = [
     satNum: 900,
     satNumRaw: '00900',
     classification: 'C',
-    intlDes: '64063C',
+    intlDes: '1964-063C',
     intlDesYear: 64,
     intlDesLaunchNum: 63,
     intlDesLaunchPiece: 'C',
@@ -103,15 +103,15 @@ export const tleData = [
   },
   {
     NOTE: 'This is not really secret information!',
-    line1: '1 A3712S 95060A   22206.53025105 -.00000022  00000+0  00000+0 0  9991' as TleLine1,
+    line1: '1 A3712S 05060A   22206.53025105 -.00000022  00000+0  00000+0 0  9991' as TleLine1,
     line2: '2 A3712  13.5389  14.0082 0001997 133.0685 227.0577  1.00275623 18615' as TleLine2,
     linenum1: 1,
     linenum2: 2,
     satNum: 103712,
     satNumRaw: 'A3712',
     classification: 'S',
-    intlDes: '95060A',
-    intlDesYear: 95,
+    intlDes: '2005-060A',
+    intlDesYear: 5,
     intlDesLaunchNum: 60,
     intlDesLaunchPiece: 'A',
     epochYear: 22,