Getting current coordinates

Hi,
I'm very new to J3d, I'm creating a solar system simulator for a uni project and I've got most of it working. The issue I have is that when I stop the animation and want to adjust the view point to look at another planet say mars I can't seem to figure out how to get the current coordinates of the planet as they wil have changed from their current position code for creating mars
      * this private method creates the planet mars
     private BranchGroup createMars(){
          BranchGroup marsBG = new BranchGroup();
          TransformGroup mars = new TransformGroup();
          mars.setCapability(TransformGroup.ALLOW_LOCAL_TO_VWORLD_READ);
          mars.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
          mars.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
          TransformGroup marsRot = new TransformGroup();
          marsRot.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
          TransformGroup rotMarsSun = new TransformGroup();
          rotMarsSun.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
          rotMarsSun.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
          rotMarsSun.setCapability(TransformGroup.ALLOW_LOCAL_TO_VWORLD_READ);
          //perform rotations
          rotation(5000, marsRot);
          rotation(75000, rotMarsSun);
          //get textures
          TextureLoader marsTex = new TextureLoader(MARS, null);
          //set position
          Transform3D marsX = new Transform3D();
          marsX.setTranslation(new Vector3f(20.0f, 0.0f, 0.0f));
          mars.setTransform(marsX);
          //set Apperance
          Appearance marsApp = new Appearance();
          marsApp.setTexture(marsTex.getTexture());
          //set Material
          Material material = new Material();
          material.setDiffuseColor(white);
          material.setAmbientColor(white);
          material.setSpecularColor(white);
          marsApp.setMaterial(material);
          //create planets
          Sphere venusS = new Sphere(0.4f, Sphere.GENERATE_TEXTURE_COORDS
                    | Sphere.GENERATE_NORMALS, 40, marsApp);
          marsRot.addChild(venusS);
          mars.addChild(marsRot);
          rotMarsSun.addChild(mars);
          marsBG.addChild(rotMarsSun);
          return marsBG;
     }//end of create marscode for rotate
     private void rotation( int v, TransformGroup target ) {
          Alpha a = new Alpha( -1, v );
          rotInter = new RotationInterpolator( a, target );
          rotBehaviours.add( rotInter );
          rotInter.setSchedulingBounds( BIGBOUNDS );
          rotInter.setTarget( target );
          alphaVector.add( rotInter );
          target.addChild( rotInter );
     } // end rotationnow when I call the marsBG.toString method it shows me all the current coordinates but am unable to get them out unless I use some elaborate regex. Their must be an easier way to do it just can't put my finger on it.
Thanks in advance

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