8
It's moving far too fast and is far too massive to "move" anywhere. If it was a threat to earth we might be able to shove it a tiny bit so that it and earth aren't at the same spot at the same time... that's about all we could hope to do.8603103a":11ufh95b said:how about move the asteroid to a lagrange point and we will acheive lagrange colonization,this is our oppurnityto acheive space colonization.
I'm guessing that even though apophis will be nearby in its close approaches to Earth, the delta-v needed to land a probe on it - or to closely orbit it - would be about the same as that needed to put that same probe in it's own (similar) orbit. I may be worng about this.SteveCNC":2co053q5 said:It might be a good one to drop a probe on to though since it will be nearby .
My thinking is a small probe wouldn't require as much fuel to aquire delta V and would therefore be more doable being it could be remotely guided in for final approach with less lag due to the close proximity . This is the kind of mission the hybrid would be a good choice for the leo to neo run .csmyth3025":3oc4cy62 said:I'm guessing that even though apophis will be nearby in its close approaches to Earth, the delta-v needed to land a probe on it - or to closely orbit it - would be about the same as that needed to put that same probe in it's own (similar) orbit. I may be worng about this.SteveCNC":3oc4cy62 said:It might be a good one to drop a probe on to though since it will be nearby .
It might be useful to put an RTG powered beacon or, at least, a reflector on it to make it easier to track. The cost for such a limited-purpose mission might be prohibitive, though (about $140 million according to Wikipedia). Still, if the thing bangs into a space rock or an iceball big enough to just slightly change its orbit, it would be nice to know about it early on - just in case.
This brings up a question: How much of apophis's orbit are we actually able to track?
Chris
No, you are absolutely correct. It passes earth at relative speed of ~ 6 km/sec.csmyth3025":1e39cdrt said:I'm guessing that even though apophis will be nearby in its close approaches to Earth, the delta-v needed to land a probe on it - or to closely orbit it - would be about the same as that needed to put that same probe in it's own (similar) orbit. I may be worng about this.SteveCNC":1e39cdrt said:It might be a good one to drop a probe on to though since it will be nearby .
The biggest unknowns are actually various effects of solar radiation, the Yarkovsky and YORP effects. Having a radio transponder on the surface would allow considerable refinement of the orbit (though it is very well known) and continuous monitoring of the changes caused by these subtle radiation pressures.It might be useful to put an RTG powered beacon or, at least, a reflector on it to make it easier to track. The cost for such a limited-purpose mission might be prohibitive, though (about $140 million according to Wikipedia). Still, if the thing bangs into a space rock or an iceball big enough to just slightly change its orbit, it would be nice to know about it early on - just in case.
Well, when it's close, and not behind the sun we can track it. The last visual obs were taken Jan 9, 2008, the discovery obs on Mar 15 2004 with a total of 1410 visual observations (and 6 rejected as outliers). In addition to the visual obs, Arecibo made 2 radar range observations, and 5 doppler velocity measurements between January 2005 and May 2006 at it's last close approach. These made the orbit extremely accurate, probably the most accurate for any asteroid.This brings up a question: How much of apophis's orbit are we actually able to track?
Chris
They would probably also want to take 100 years worth of spare parts and a couple of pairs of small children (male and female - not related) so that the children of those children can take care of their parents in their old age.MeteorWayne":d4z74awg said:ROFL...a hundred year supply of food and water? Have you calculated the mass and cost????? :lol: :lol: :lol:
how old are you???8603103a":2k44m6kz said:We will build a telescope,bio center and a small town over there,i prefer the town name is Celestia, which means the space town always face the space.But , we have to acheive some tech to permanently providing oxygen on there.Can someone figure out how to provide the gas permanently to the colony.
Yeah,some folks are really ignorant.Maybe China or Russia ( they are rushing up ) will make it first if america still does not develop more advanced tech.raptorborealis":59ayv9o8 said:When I read a thread like this, my first hope is that it is intended to be a joke.
Are people really this ignorant of the level of our space technology?
Hey folks, we still cross our fingers when an astronaut exits the ISS to fasten a bolt.