[AZ-Observing] Re: Incoming Earth-grazer
- From: Brian Skiff <Brian.Skiff@xxxxxxxxxx>
- To: BillFerris@xxxxxxx
- Date: Thu, 18 Mar 2004 12:08:14 -0700 (MST)
A revised orbit was published this morning, which should be
reliable within a few arcminutes at the time of closest approach.
http://cfa-www.harvard.edu/mpec/K04/K04F26.html
Note that you wanna stick the second set of elements into software.
This one has epoch for yesterday, which because of the very substantial
perturbations, is necessary to find it "now". As you can see, the
orbit for the standard epoch several months from now is very greatly
changed in period, semimajor axis, inclination, etc.
Minimum distance is now only 30,000 miles (50,000 km).
You should be able to get ephemerides for your location (geocentric
won't be good enough) using either the MPC site:
http://cfa-www.harvard.edu/iau/MPEph/MPEph.html
...or the JPL Horizons site:
http://horizons.jpl.nasa.gov
...or the Univ of Pisa 'NEODys' page for this object:
http://newton.dm.unipi.it/cgi-bin/neodys/neoibo?objects:2004FH;main
\Brian
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