initial version of OsirisRex

open/osirisRex.md

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+Overview
+-------------------------------------------
+
+* What is OSIRIS-REx and where is it going?
+  - Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer
+* Why? What is the scientific goal?
+* Why this particular asteroid?
+   - Feasible to reach or scientifically especially interesting.
+* What sensors does the spacecraft have for the science?
+* What will OSIRIS-REx do that's never been done before?
+* When did it launch? How long do we expect the trip to be?
+
+* The spacecraft itself
+  - sizes, weights
+  - bus systems (not scientific) 
+
+
+How to get there - and back
+-------------------------------------------------------
+* Slingshot. Explain.
+* What is the required precision wrt. to timing, locations, etc.
+  to make such a slingshot work?
+* Can a slingshot change the orbital plane/inclination?  
+  (Bennu is six degrees off ...) I thought one can only 
+  boost "in plane"?
+* How have previous missions helped NASA perfect the art of the gravity assist?
+* How do you monitor, control, the orbit
+* Which kinds of trajectory-altering burns are necessary
+* Longer "sleep" phases?
+* What kind of propulsion? Chemical vs. Electric?
+
+
+
+Redezvous/Landing
+------------------------------------------------------
+* More like a "docking" as in Rosetta? Or real "landing"?
+  - What is the gravitational situation like?
+  - How does it "anchor" itself to the asteroid?
+
+* How do you technically grab the sample? Drill?
+
+Sample Return
+------------------------------------------
+* Why not do the science there?
+  - is it easier to get material back vs.
+  - bringing the lab there 
+* What kind of science do we hope to gain from studying Bennu, 
+  especially with samples here on Earth?
+* How do you determine when and where to get the sample from Bennu?
+
+* How to get back? 
+  - "Reverse" the trajectory to get there feasible?
+  - How long will it stay? The asteroid will have moved on wrt. earth
+    at the time of return. Different trajectory?
+
+* When back? arrive at Earth in 2023.
+
+Other science
+--------------------------------------------
+* map the asteroid in exquisite detail
+* study its orbit and interior
+* coincidental? Pictures of Jupiter.
+
+Notes
+----------------------------------------------
+LBT "sees" OsirisRex:
+  https://www.nasa.gov/image-feature/goddard/2017/large-binocular-telescope-snags-first-glimpse-of-osiris-rex