Hom much memory does a Jquery Element Reference Take Up?

If I have a plugin that makes reference to the same JQuery objects constantly I figure I should cache the reference.

I was wondering if anyone knew off hand how much memory a jquery reference takes up?

Also I do understand that the price of the JQuery lookup far exeeds the price of the reference itself.

$('sameElement') 

vs

this.sameElement = $('sameElement'); 
this.sameElement