Welcome, Guest. Please Login.
Gravity Simulator
11/20/17 at 20:41:02
News: Registration for new users has been disabled to discourage spam. If you would like to join the forum please send me an email with your desired screen name to tony at gravitysimulator dot com.
Home Help Search Login


Pages: 1
Send Topic Print
A new moon for Earth (Read 4264 times)
Tony
YaBB Administrator
*****




Posts: 1051
Gender: male
A new moon for Earth
06/16/07 at 14:49:10
 
Earth may have a temporary 2nd moon.  Captured into Earth orbit in June 2006, JPL considers this object manmade space junk, but scientists are becoming more confident that it is indeed a rock, about 4 meters wide.  Read more here:  http://en.wikipedia.org/wiki/6R10DB9
 
Here are the results of a simulation using starting conditions supplied by JPL Horizons.  It show 6R10DB9 from its June 2006 capture into Earth orbit to its September 2007 escape.  
 
The first image is from the top looking down, the second is from the ecliptic.


 
If you want to try this simulation yourself, here's the link to the simulation:
http://orbitsimulator.com/gravity/simulations/6R10DB9.gsim
Back to top
 
 
Email View Profile WWW   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A new moon for Earth
Reply #1 - 06/16/07 at 17:04:02
 
Any idea were this "thing" comes from if you go back in time ? I tried to get the ephemerides of this body in the Near Earth site of JPL but didn't find it ( "unknown") . How did you manage to get his coordinates ?
Back to top
 
 
Email View Profile   IP Logged
Tony
YaBB Administrator
*****




Posts: 1051
Gender: male
Re: A new moon for Earth
Reply #2 - 06/16/07 at 18:01:14
 
Quote from frankuitaalst on 06/16/07 at 17:04:02:
How did you manage to get his coordinates ?

I use data from JPL Horizons.  I use a stand-along program that I wrote to automate the process of making .gsim files from Horizons data.  I'll start a new thread describing the program.
Back to top
 
 
Email View Profile WWW   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A new moon for Earth
Reply #3 - 06/17/07 at 09:26:28
 
I didn't manage to find the 6R10DB9 in the JPL-database , but ran the above .gsim reversed in time in a rotating frame rotating with earth and centered on earth .  
The agif hereunder shows the body as it is trapped by earth and escapes in 2006 . Surprisingly this body must have been close to earth between 22/03/1979 and 26/01/1980 as can be seen at the end of the gif . ( The body appeared suddenly , so I wasn't able to pinpoint a more accurate date ) . Taking this close approach into account it may be manmade ...
Back to top
 

6R10D89.gif
Email View Profile   IP Logged
frankuitaalst
Ultimate Member
*****


Great site

Posts: 1507
Gender: male
Re: A new moon for Earth
Reply #4 - 06/18/07 at 09:01:29
 
The body came close in 1979 as can be seen hereunder . However at its closest approach it was still outside the moon orbit (if calculations are right while the sun pressure is not taken into account ) . So little change it is manmade I think .
Back to top
 

DistEarth.gif
Email View Profile   IP Logged
Pages: 1
Send Topic Print