public void MakeAsteroid()
{
var obt = Orbit.CreateRandomOrbitNearby(vessel.orbit);
var seed = (uint)UnityEngine.Random.Range(0, int.MaxValue);
var ast = DiscoverableObjectsUtil.SpawnAsteroid("Ast. N" + seed, obt, seed, UntrackedObjectClass.E, 5e5, 1e6);
ast.vesselRef.DiscoveryInfo.SetLevel(DiscoveryLevels.Owned);
}