Starting mean anomalies for steps.

dist/dedicated-workers/libs/trajectory-calculator.js

@@ -127,6 +127,14 @@ class TrajectoryCalculator {
         const { minLegDuration } = this.config;
         infos.duration = Math.max(minLegDuration, infos.duration);
     }
+    computeStartingMeanAnomalies() {
+        for (let i = 1; i < this.steps.length - 1; i++) {
+            const step = this.steps[i];
+            const { orbitElts, angles } = step;
+            const e = orbitElts.eccentricity;
+            step.startM = Physics3D.meanAnomalyFromTrueAnomaly(angles.begin, e);
+        }
+    }
     recomputeLegsSecondArcs() {
         for (let i = 0; i < this._secondArcsData.length; i++) {
             const data = this._secondArcsData[i];
@@ -160,6 +168,7 @@ class TrajectoryCalculator {
             drawAngles: { begin: 0, end: TWO_PI },
             duration: 0,
             dateOfStart: this._lastStepEndDate,
+            startM: 0,
             maneuvre: maneuvre
         });
     }
@@ -198,7 +207,8 @@ class TrajectoryCalculator {
             angles: angles,
             drawAngles: drawAngles,
             duration: tof,
-            dateOfStart: this._lastStepEndDate
+            dateOfStart: this._lastStepEndDate,
+            startM: 0
         });
         this._vesselState = periapsisState;
         this._secondArcsData.push({
@@ -284,6 +294,7 @@ class TrajectoryCalculator {
             drawAngles: drawAngles,
             duration: tof,
             dateOfStart: this._lastStepEndDate,
+            startM: 0,
             flyby: flybyDetails
         });
         const exitState = Physics3D.orbitElementsToState(flybyOrbit, body, exitAngle);
@@ -339,6 +350,7 @@ class TrajectoryCalculator {
             drawAngles: drawAngles,
             duration: arcDuration,
             dateOfStart: this._lastStepEndDate,
+            startM: 0,
             maneuvre: maneuvre
         });
         this._vesselState = encounterState;
@@ -376,6 +388,7 @@ class TrajectoryCalculator {
             drawAngles: drawAngles,
             duration: arcDuration,
             dateOfStart: exitDate,
+            startM: 0
         });
         this._vesselState = preDSMState;
         this._preDSMState = preDSMState;
@@ -408,7 +421,8 @@ class TrajectoryCalculator {
             drawAngles: { begin: 0, end: soiExitAngle },
             duration: tof,
             dateOfStart: this._lastStepEndDate,
-            maneuvre: maneuvre
+            startM: 0,
+            maneuvre: maneuvre,
         });
         const exitState = Physics3D.orbitElementsToState(ejOrbit, depBody, soiExitAngle);
         this._vesselState = exitState;
@@ -424,7 +438,8 @@ class TrajectoryCalculator {
             angles: { begin: 0, end: 0 },
             drawAngles: { begin: 0, end: TWO_PI },
             duration: 0,
-            dateOfStart: lerp(dateMin, dateMax, dateParam)
+            dateOfStart: lerp(dateMin, dateMax, dateParam),
+            startM: 0
         });
     }
 }

dist/dedicated-workers/trajectory-optimizer.js

@@ -67,6 +67,7 @@ class TrajectoryOptimizer extends WorkerEnvironment {
                 this._deltaVs[i] = this._newDeltaVs[i];
             }
         }
+        this._bestTrajectory.computeStartingMeanAnomalies();
         sendResult({
             popChunk: this._evolver.popChunk,
             fitChunk: this._evolver.fitChunk,

src/dedicated-workers/libs/trajectory-calculator.ts

@@ -194,6 +194,15 @@ class TrajectoryCalculator {
         infos.duration = Math.max(minLegDuration, infos.duration);
     }
 
+    public computeStartingMeanAnomalies(){
+        for(let i = 1; i < this.steps.length-1; i++){ // ignore begin and end circular orbits
+            const step = this.steps[i];
+            const {orbitElts, angles} = step;
+            const e = orbitElts.eccentricity;
+            step.startM = Physics3D.meanAnomalyFromTrueAnomaly(angles.begin, e);
+        }
+    }
+
     /**
      * Recomputes the second arc of a all legs accounting this time for SOI enter points,
      * thus providing a more precise visualization of the orbit.
@@ -247,6 +256,7 @@ class TrajectoryCalculator {
             drawAngles:  {begin: 0, end: TWO_PI},
             duration:    0,
             dateOfStart: this._lastStepEndDate,
+            startM:      0,
             maneuvre:    maneuvre
         });
     }
@@ -317,7 +327,8 @@ class TrajectoryCalculator {
             angles:      angles,
             drawAngles:  drawAngles,
             duration:    tof,
-            dateOfStart: this._lastStepEndDate
+            dateOfStart: this._lastStepEndDate,
+            startM:      0
         });
 
         // Store the state of the vessel at periapsis for further
@@ -457,6 +468,7 @@ class TrajectoryCalculator {
             drawAngles:  drawAngles,
             duration:    tof,
             dateOfStart: this._lastStepEndDate,
+            startM:      0,
             flyby:       flybyDetails
         });
 
@@ -536,6 +548,7 @@ class TrajectoryCalculator {
             drawAngles:  drawAngles,
             duration:    arcDuration,
             dateOfStart: this._lastStepEndDate,
+            startM:      0,
             maneuvre:    maneuvre
         });
 
@@ -598,6 +611,7 @@ class TrajectoryCalculator {
             drawAngles:  drawAngles,
             duration:    arcDuration,
             dateOfStart: exitDate,
+            startM:      0
         });
 
         // Store the pre-DSM state to use it in the second arc maneuver calculation
@@ -656,7 +670,8 @@ class TrajectoryCalculator {
             drawAngles:  {begin: 0, end: soiExitAngle},
             duration:    tof,
             dateOfStart: this._lastStepEndDate,
-            maneuvre:    maneuvre
+            startM:      0,
+            maneuvre:    maneuvre,
         });
 
         // Compute the state of the vessel relative to the exited body when exiting its SOI
@@ -679,7 +694,8 @@ class TrajectoryCalculator {
             angles:      {begin: 0, end: 0},
             drawAngles:  {begin: 0, end: TWO_PI},
             duration:    0,
-            dateOfStart: lerp(dateMin, dateMax, dateParam)
+            dateOfStart: lerp(dateMin, dateMax, dateParam),
+            startM:      0
         });
     }
 }

src/dedicated-workers/trajectory-optimizer.ts

@@ -110,6 +110,8 @@ class TrajectoryOptimizer extends WorkerEnvironment {
             }
         }
 
+        this._bestTrajectory.computeStartingMeanAnomalies();
+        
         sendResult({
             popChunk:   this._evolver.popChunk,
             fitChunk:   this._evolver.fitChunk,

src/types.d.ts

@@ -215,6 +215,7 @@ type TrajectoryStep = {
     drawAngles:  ArcEndsAngles,
     dateOfStart: number,
     duration:    number,
+    startM:      number,
     maneuvre?:   ManeuvreInfo,
     flyby?:      FlybyInfo
 };