Jim. You need only one of the MPCORB files. Guide will read either one
after you place the zipped file into the main Guide folder and unzip it,
then click on the "use MPCORB" button. The "Add MPC Comets/Asteroids'
button is for adding the daily orbit update file or the elements from the
MPECs. Some computer systems need the "cr" file which starts each asteroid
on a new line. Nice for looking at the file but not necessary for Guide to
access the data.

Bob Elliott


At 10:33 2000-09-29 -0700, Jim wrote:

>Hi Bill-
> I am using the Aug 8, 2000 upgrade of Guide but my Extras menu choice
>USE MPCORB is unselectable (grey). I have installed recent downloads of
>mpcorb.dat and MPCORBcr.dat in the asteroid folder. I notice that these
>appear to be in different formats from astorb and I suspect that the older
>astorb is the asteroid file that continues to be used in spite of the fact
>that I have selected 'Add MPC Comets/Asteroids'.