Help on Collision

New to Unity and need some help about dealing with collisions properly.
I want the "Player" to stick on the Object (Planet) on collision. This works. But when i want to move away from the Object, there is another collision from the object i was befor and it behaves weird. (moves slightly away from the object, see gif)

collision_problem.gif

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using System.Threading;
4. using UnityEngine;
5.  
6. public class SwipeScript : MonoBehaviour
7. {
8.     private Vector2 startPosition, endPosition, direction;
9.     private float touchTimeStart, touchTimeFinish, timeInterval;
10.  
11.     [Range(1f, 3f)] public float throwForce = 1f;
12.  
13.  
14.  
15.     // Start is called before the first frame update
16.     void Start()
17.     {
18.        
19.     }
20.  
21.     // Update is called once per frame
22.     void Update()
23.     {
24.         if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began)
25.         {
26.             touchTimeStart = Time.time;
27.             startPosition = Input.GetTouch(0).position;
28.         }
29.  
30.         if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Ended)
31.         {
32.             touchTimeFinish = Time.time;
33.            
34.             timeInterval = touchTimeFinish - touchTimeStart;
35.             endPosition = Input.GetTouch(0).position;
36.  
37.             direction = startPosition - endPosition;
38.  
39.             GetComponent<Rigidbody2D>().bodyType = RigidbodyType2D.Dynamic;
40.             GetComponent<Rigidbody2D>().transform.parent = null;
41.             GetComponent<Rigidbody2D>().AddForce(-direction * throwForce);
42.  
43.         }
44.     }
45.  
46.     void OnCollisionEnter2D(Collision2D col)
47.     {
48.         print("Collision");
49.         if (col.gameObject.tag == "Planet")
50.         {
51.             Debug.Log("Planet Collision");
52.             GetComponent<Rigidbody2D>().velocity = Vector3.zero;
53.             GetComponent<Rigidbody2D>().bodyType = RigidbodyType2D.Static;
54.             transform.SetParent(col.transform);
55.         }
56.     }
57.  
58.     void OnCollisionExit2D(Collision2D col)
59.     {
60.         print("CollisionExit");
61.         if (col.gameObject.tag == "Planet")
62.         {
63.             //col.transform.parent = null;
64.         }
65.     }
66. }
67.  

Maybe there is another way to do this or did i miss something?

Glad for any help from you guys.