How to calculate the orbit of a minor planet?

[neptunecs]

Hello all:
I'm interested in minor planet.Could you tell me how to calculate the orbit of a minor planet accurately? Is there any software to calculate it?
And how to get the latest information of the minor planets?Any websites of famous international institutes who observe and research minor planets?
Thank you very much.
neptunecs.

 

[D H]

http://ssd.jpl.nasa.gov/?horizons

 

[Chronos]

Keplers laws is the short answer.