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Add MPC comets/asteroids
Use MPCORB
Enter Time
Fixed levels
Line of variation
Toggle user datasets
Make PostScript file
Make .BMP File
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Find conjunction
Show eclipse
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Install to hard drive

   The "DSS/RealSky Images" option leads to a dialog box in which
images from the Digital Sky Survey and RealSky datasets can be
extracted and their display controlled.  This is discussed in detail
starting on page 54.

   "Get A1.0/A2.0 data" provides some options to access two huge
star catalogs created by the USNO (US Naval Observatory),  and to
control their display.  This is discussed starting on page 56.

   In the "Edit Comet data" option you may add new comets and asteroids
by entering their orbital elements (detailed instructions on page 77).
                                                                 
   The MPC (Minor Planet Center) has very kindly provided orbital
elements for comets and asteroids,  suitable for use in Guide, on its
Web site.  You can get data for currently visible comets, "Critical
List" minor planets, and distant minor planets (those beyond the orbit
of Saturn).  The files can be downloaded from

http://cfa-www.harvard.edu/iau/Ephemerides/Soft02.html

   in either ASCII text or HTML format (Guide can use both,  so it
doesn't matter which you use.)  Once you have downloaded the data you'd
like to use,  click on the "Add MPC comets/asteroids" option.  Guide
will ask for the name of the file you've downloaded;  provide it,  and
Guide will add new objects and update old objects using that data.

   Alternatively,  if you subscribe to the Minor Planet Electronic
Circular (MPECs) distributed via e-mail by the MPC,  you can specify a
file containing one or more Circulars. Guide will comb through it for
orbital data,  and add the orbits to its database.
                                             
   The "Use MPCORB" option is grayed out by default.  It allows you to
switch between Guide's built-in asteroid data,  or the data in a file
of asteroid elements downloaded from the MPC's ftp site.  This file is
available at:

ftp://cfa-ftp.harvard.edu/pub/MPCORB

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