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OSIRIS-REx is a NASA robotic sample return mission going to near-Earth asteroid Bennu. Bennu is a primitive asteroid, roughly spherical and 1/2 km across in an orbit mostly between Earth and Mars. (There isn't really a comparable object in the Kerbol System.) OSIRIS-REx launches at around sunset on an Atlas V 411 rocket. It has a wet mass of 2110 kg. There are numerous images of the at dslauretta.com. Below is also a file with collection of spacecraft drawings from a design review. All of these are approved for distribution, so between the photos and the drawings you should have a tremendous insight into the design. CAD Drawings (PDF) My name is Dr. Jason Dworkin and I am the Project Scientist for the mission and I have made a few versions of OSIRIS-REx, including the this (PDF) in stock 1.0.5 parts. But is far too heavy, the center of mass is not well aligned with the center of thrust, and I have been unsatisfied with my use of mods to articulate the solar arrays and sampling arm. I did a launch with Launchers Pack, OSFairings, TweakScale, InfernalRobotics, and some mass edits to some stock parts but there were still issues. I'll bet you can do better. I challenge this community to create, launch, rendezvous, and return a sample. I look forward to your results. Detailed rules below. The contest closed October 8, 2016 at 7:05pm EDT.
If you are in the Denver area, here is an opportunity to see a the OSIRIS-REx spacecraft before it launches in September 2016. You can also use the experience to help you model this and other probes. http://www.nasa.gov/social/osiris-rex-preview