jquery trigger hover on anchor

I'm using jQuery to develop in web environment.

I want to know why

 $("#a#trigger").trigger('mouseenter');
 $("#a#trigger").trigger('hover');
 $("#a#trigger").trigger('mouseover');

All 3 of those aren't working to activate a hover function that I have.

$(function() {


        $('a#trigger').hover(function(e) {
          $('div#pop-up').show();

             }, function() {
          $('div#pop-up').hide();
        });

     });

      });

a#trigger is the name of the anchor, and #pop-up is a div element in my web.

The problem is that I want to mouse over some event in FullCalendar plugin and those functions aren't working. Thanks.