Upon submission, you get a PDF certificate too.
http://www.planetary.org/get-involved/messages/hayabusa-2/
Deadline Extended: August 9, 5:00PM (PST)
The Planetary Society and Japan Aerospace Exploration Agency (JAXA) invite you to send your name and message to Asteroid 1999 JU3 and return to Earth on Hayabusa-2.
The Japan Aerospace Exploration Agency (JAXA) is scheduled to launch the asteroid explorer Hayabusa-2 in 2014. Hayabusa-2 will arrive at an asteroid in 2018 to investigate it for one and half years, before returning to Earth in 2020.
How will my name or name and message be delivered?
You can select either option below, or both!
I. Your name will be recorded on the target marker that lands on Asteroid 1999 JU3 where it will remain.
II. Your names AND messages will be recorded in the memory chips that will be loaded onto the Hayabusa-2 re-entry capsule returning to Earth in 2020.
awesome. as long as they're not landing on LV-426.