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Originally posted by OrionsWitness
reply to post by smurfy
Thanks mate, the link is interesting..and it backs up our assertions, no one knows for sure as you say.
And the distance estimated is very very small (21,000 miles...considering the rock is traveling at approx 27,000 miles per hour (from memory).
Re: [MPML] 2012 DA14 recovered < Prev Next >
Posted By: geraldspace geraldspace Send Email
Thu Jan 10, 2013 7:32 pm |
I was going off the JPL numbers. Two days ago, they were giving a close
approach distance of 0.0002337995 AU (34,976 km), based on the observations
through May. With the new data, JPL now shows a nominal close approach of
0.000228014368 AU (34,110 km). That's were I got the 800 km difference I
mentioned in my earlier email (actually about 866 km). It looks like their new
value for q is pretty close to yours.
>From: Bill Gray pluto@...>
>Sent: Jan 10, 2013 10:50 AM
>To: Gerald McKeegan geraldspace@...>
>Cc: MPML email@example.com>
>Subject: Re: [MPML] 2012 DA14 recovered
> I'd have said it was nudged in by more like 3700 km (per my previous
>message: before, q was 37810 +/- 9000 km; now, I'm getting 34106
>+/- 226 km.) Much depends on the weighting of observations, though.
> Pseudo-MPEC is at
> The recovery was about an arcminute off prediction. The predicted mag was
>about 24.2, though it was observed to be around 23.4. Maybe it was caught
>at a bright part of the light curve. That might also explain why, though
>the (304) data has residuals of a bit over an arcsecond, they're all within
>.1 arcsecond of the predicted track.
Originally posted by rickymouse
Why do some of the distance calculations use the center of the earth as the reference for distance instead of the surface of the earth? I noticed that on a close asteroid last year.
It will according to the latest NEA predictions , travel approx 0.009 LDs
THey may be using Colgate or not, but all I say is keep an eye out.
"2012 DA14 will definitely not hit Earth," emphasizes Yeomans. "The orbit of the asteroid is known well enough to rule out an impact."
"The odds of an impact with a satellite are extremely remote," he says. Almost nothing orbits where DA14 will pass the Earth.