Trajectory2D not accurate

Hello,

I'm spawning a meteor around a planet on which i apllied a script to get rotational gravity. I apply a force to the meteor on spawn and try to get its trajectory. I putted gravity scale and drag to 0 and mass to 1. But the trajectory is not accurated. Here's my code, sorry for useless variables sometimes, i'm trying to figuring out :

Code of Gravity

   using System.Collections;
     using System.Collections.Generic;
     using System.Diagnostics;
     using UnityEngine;
 
     public class Gravity : MonoBehaviour
 
     {
         Rigidbody2D rb;
     Vector2 lookDirection;
 
     float lookAngle;
 
     [Header("Gravity")]
 
     // Distance where gravity works
     [Range(0.0f, 1000.0f)]
     public float maxGravDist = 150.0f;
 
     // Gravity force
     [Range(0.0f, 1000.0f)]
     public float maxGravity = 150.0f;
 
     // Your planet
     public GameObject planet;
 
 
 void Start()
 {
     rb = GetComponent<Rigidbody2D>();
 }
 
 void FixedUpdate()
 {
         //if (!(Input.GetMouseButton(0))) // Does not affect the comet while the player is still touching the screen
        // {
             // Distance to the planet
     float dist = Vector2.Distance(planet.transform.position, transform.position);
 
         // Gravity
     Vector2 v = planet.transform.position - transform.position;
     rb.AddForce(v.normalized* (1.0f - dist / maxGravDist) * maxGravity);
 
 
         // Rotating to the planet   Pas besoin en 2D je crois
         //lookDirection = planet.transform.position - transform.position;
         //lookAngle = Mathf.Atan2(lookDirection.y, lookDirection.x) * Mathf.Rad2Deg;
 
         //transform.rotation = Quaternion.Euler(0f, 0f, lookAngle);
         //}
     }
 }

Code of spawning Meteor :

 using Microsoft.Win32;
 using System.CodeDom;
 using System.Collections;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
 using UnityEngine;
 
 public class Spawn_Object : MonoBehaviour
 {
 
     public Rigidbody2D prefab;
     public Rigidbody2D clone;
     public LineRenderer lr;
 
     // Your planet
     public GameObject planet;
     public Vector2 position;
     private Vector2 velocity;
     private Vector3 pos;
     private Vector2 power;
 
 
 
     public Vector2 worldPosition;
 
 
     // Update is called once per frame
     void Update()
     {
 
         if (Input.GetMouseButtonDown(0))
         {
 
             worldPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             //DragStartPos = worldPosition;
 
 
             clone = Instantiate(prefab, worldPosition, Quaternion.identity);
             clone.constraints = RigidbodyConstraints2D.FreezeAll;
 
             lr = clone.GetComponent<LineRenderer>();
 
             
 
 
 
         }
 
         if (Input.GetMouseButton(0))
         {
 
             velocity.x = 0;
             velocity.y = 0;
             
 
             position = worldPosition;
             power = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             power = worldPosition - power ;
             power *= 100f;
             
             UnityEngine.Debug.Log(power);
             velocity += power;
             Vector3 posActual = worldPosition;
             
             for (int i = 0; i < 200; ++i)
             {
                 pos = position;
                 posActual = pos;
                 lr.SetPosition(i, pos);
                 float dist = Vector2.Distance(planet.transform.position, posActual);
                 Vector2 v = (planet.transform.position - posActual);
                 Vector2 AccOfGravity = (v.normalized * (1.0f - dist / 150) * 150);
                 velocity += AccOfGravity * Time.fixedDeltaTime;
 
                 position += velocity * Time.fixedDeltaTime; // move point
                 //UnityEngine.Debug.Log(position);
                 // Plot the predicted point visually
 
                 
                 
                 
             }
 
 
         }
 
         if (Input.GetMouseButtonUp(0))
         {
             //Vector2 DragEndPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             //Vector2 _velocity = (DragEndPosition - DragStartPos) * power;
 
             //clone.velocity = _velocity;
 
             UnityEngine.Debug.Log(Time.fixedDeltaTime);
             clone.constraints = RigidbodyConstraints2D.None;
             clone.velocity += power;
         }
     }
 
 
     }

Thanks for your help :)