[zxyzzxxx]

I'm guessing they will measure the increased rate of orbit decay then the sails are deployed?

[xenophonf]

If I recall correctly from Bill Nye's AMA, this is just a technology test. They're launching the real mission next year. I'll see if I can dig up the link for you.

Edit: Here's the link - https://www.reddit.com/r/IAmA/comments/35q9z7/i_am_bill_nye_...