move a 2d item in a circle around a fixed point

Answer, adapted from https://www.reddit.com/r/Unity2D/comments/34qm8v/how_to_move_an_object_in_a_circular_pattern/

 public class Target : MonoBehaviour 
 {
 
     private float RotateSpeed = 5f;
     private float Radius = 0.1f;
 
     private Vector2 _centre;
     private float _angle;
 
     private void Start()
     {
         _centre = transform.position;
     }
 
     private void Update()
     {
 
         _angle += RotateSpeed * Time.deltaTime;
 
         var offset = new Vector2(Mathf.Sin(_angle), Mathf.Cos(_angle)) * Radius;
         transform.position = _centre + offset;
     }
  
  
 
 }