Hi Sebastià,

There are two things you can do here.

You can click on Extras... Edit Comet Data, and you'll see that
(89) Julia is in the list. Click on this. You will see a "Delete"
button. Click on this, then on "OK" to confirm that yes, you want
to delete these elements for (89) Julia.

Guide will then go back to its "original" elements for Julia.

However, you probably have _many_ asteroids loaded in this manner.
Here is how to get rid of many or all of them at once. Edit the file
'comets.dat' in Notepad or Wordpad or a similar text editor. Delete
any or all of the asteroid lines.

There is a number at the top of 'comets.dat' that tells Guide how
many objects to expect. Subtract the number of lines you have removed,
and change the number at the top of the file accordingly.

Again, once you start Guide again, it will go back to the original
elements for those asteroids.

-- Bill