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NASA's ARM Will Take a Boulder From an Asteroid and Put It In Lunar Orbit
coondoggie writes NASA officials today said they have picked the specific asteroid mission and offered new details for that mission which could launch in the 2020 timeframe. Specifically, NASA's associate administrator Robert Lightfoot said the Asteroid Redirect Mission (ARM) will rendezvous with the target asteroid, land a robotic spacecraft on the surface, grab a 4 meter or so sized boulder and begin a six-year journey to redirect the boulder into orbit around the moon for exploration by astronauts.
In order to account for binary systems, I generally look at the central axis of rotation - if it's inside one of the bodies, that body is the 'primary' - IE a planet, sun, whatever. If it's outside, then it's a double system.
I don't read AC A human right
They rotate around a common center of gravity. But that center of gravity is inside the Earth. Or to put it another way, no.
Rendezvousing with asteroids is actually really tricky, especially if you want to get the same one twice. Hell with astronauts--putting this boulder somewhere that we can reach it over and over again, even just with probes, is a real big win. Especially considering how the last asteroid mission went... I don't think astronauts are the important part of the equation so much as the lunar orbit part is.
Even then I'm wondering how easy it is to get this thing back to Earth surface intact. If it was tiny, then sure, stuff it in aerogel, but this thing is going to be somewhere on the order of 800,000 kilograms (napkin estimate)...that's almost half the mass that the Space Shuttle was when full of fuel, and one hell of a lot more than its payload-to-landing! Anything you wrap it in is going to wreck fine features of the surface when you decelerate--for scientific purposes, it's a lot more fragile than astronauts. You need to pickaxe parts off of it gently for transport and study. I'm not sure how good our teleoperated waldos are in practice, so...astronauts.