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So ... what does TAG day look like for me? First, I leave orbit to begin my journey to Bennu's surface, then perform the Checkpoint and Matchpoint burns to steeply descend to the surface, and then… it's sample collection time! https://twitter.com/OSIRISREx/status/1308516620130635776/video/1 …
Using my TAGSAM arm, I'll touch site Nightingale for several seconds. Once I sense contact with the surface, I'll fire a bottle of nitrogen gas to disturb the ground, and some of that material will be gathered in the sample collector head. Finally putting my arm to use 
pic.twitter.com/RIfjvCH1FG
My arm has a spring in its "elbow", so when I touchdown on the surface the spring will compress a little (kind of like a pogo stick). This compression is what signals the gas bottle to fire 
pic.twitter.com/PCAMyH3Ntl
Go time!
How fast will you be going as you approach Bennu?
"Fast" isn't the right word for it. I'll be traveling at an average speed of about 0.2 mph - the standard walking pace of a tortoise. 
all will go well
We’ve waited and watched a long time for this. Wow wow wow. What a journey so far. You rock! 
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