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The variable that needs to be looked at is not time of perigree, but distance. On March 30 Elenin was still in the asteroid belt and thus potentially subjected to a number of perturbations. As more observations are made and as it gets closer we also get a more accurate estimate on how fast it is going. This is going to change the date of perigree.
This means that on March 30, October 17 was not the estimated date for when Elenin is closest. The estimated distance of perigree however, has remained constant. On January 17, the distance was estimated at .24 AU. Presently the distance is estimated at .233. This equates to a change of 2.9% over the course of 7 months. I'd say that their estimates of perigree distance have been spot on the entire time and that there is absolutely no risk for impact. In fact based on 2218 observations the margin of error for perigree is .0092%.
I understand one can use time machine to go back and view the source, have you done this?
Originally posted by CaptainInstaban
reply to post by Xcalibur254
Do you have a link to that pic, or is the OP pic fake, and yours automatically the real deal? Why couildn´t you find an Oct. 17 pic?
reply to post by trueperspective
If everyone would just verify my data from the source and stop making fun of my horrible cropping skills, we would be having a different debate.
Originally posted by trueperspective
I want an explaination as to why there is such a massive difference.
Originally posted by Xcalibur254
reply to post by trueperspective
I've seen no one mocking your cropping. I have however seen you ignore the verifiable evidence we have presented that the elenin.org picture is wrong. Elenin was never predicted to be .4 AU away on October 17. SatoriTheory has shown that elenin.org used a broken Java applet and I have provided a picture of the JPL orbit diagram of Elenin from March 30 showing the estimates for October 18 and it is consistent with current estimates. The problem here is not with NASA or JPL, but with elenin.org providing faulty information. Once again, there are no glaring discrepancies between the March 30 estimates and the current estimates.
Originally posted by CaptainInstaban
reply to post by trueperspective
I still don´t get why your pic would be off, I can hardly believe it´s because of a Java error, i also find it hard to believe someone there would fake the pic, so I don´t know.edit on 12-8-2011 by CaptainInstaban because: (no reason given)
The applet was given incorrect orbital elements. Garbage in, garbage out.