code: def to_hdf5(self, f):
          
  
          f = super(Orbit, self).to_hdf5(f)
  
          if self.potential is not None:
              import yaml
              from ..potential.potential.io import to_dict
              f['potential'] = yaml.dump(to_dict(self.potential)).encode('utf-8')
  
          if self.t:
              quantity_to_hdf5(f, 'time', self.t)
  
          return f
docs: Serialize this object to an HDF5 file.
  
          Requires ``h5py``.
  
          Parameters
          ----------
          f : str, :class:`h5py.File`
              Either the filename or an open HDF5 file.