[Action Script] can a round hit box be made? May,2012

So i'm making my first as3 game and its just a simple avoider style game. I've got most of the basics working but the objects that are being avoided are circles and since im using hitTestObject i get a square hit box :p. Is it possible to create a circular hit box?

Heres my code

ActionScript Code: package {    import flash.display.*;    import flash.events.*;    import flash.text.*;    import flash.utils.Timer;    import flash.utils.getDefinitionByName;        public class mattGame extends MovieClip {        var ship:Ship;        var gameTimer:Timer;        var army:Array;        var score:int = 0;        const speed:Number = 7.0;                public function mattGame() {                army = new Array();            var newEnemy = new Enemy( 250, -15 );            army.push( newEnemy );            addChild( newEnemy );                        ship = new Ship();            addChild(ship);                        gameTimer = new Timer( 25 );            gameTimer.addEventListener( TimerEvent.TIMER, onTick );            gameTimer.start();        }        public function onTick( timerEvent:TimerEvent ):void {            if ( Math.random() < 0.1 ){                var randomX:Number = Math.random() * 500;                var newEnemy:Enemy = new Enemy( randomX, -15 );                army.push( newEnemy );                addChild( newEnemy );            }            ship.x = mouseX;            ship.y = mouseY;                        for each ( var enemy:Enemy in army ){                enemy.moveDownABit();                if ( ship.hitTestObject( enemy ) ){                    gameTimer.stop();                }            }        }    }}
end the enemy class to

ActionScript Code: package {    import flash.display.MovieClip;    public class Enemy extends MovieClip     {        public function Enemy( startX:Number, startY:Number )         {            x = startX;            y = startY;        }                public function moveDownABit():void         {            y = y + 7;        }    }}
can a round hit box be made?

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