This is an N-body ephemeris program.
It is a combination of two packages:
The basic idea of the package is to
take the elements for a given epoch and to compute osculating elements
for an epoch in the middle of the ephemeris interval. These elements are
then transfered to the two-body ephemeris program to compute the ephemeris.
Therefore, if you require a high-precision ephemeris it is suggested to
use a short time interval (up to several months), otherwise the osculating
elements used in the two body ephemeris will not represent the correct
elements at the beginning and end of the interval. In case non-gravitational
effects are considered, they are only taken into account in the evolution
of osculating elements.
a numerical integrator of the equations
of motion under gravitational forces (RADAU, order 15 by Everhart), including
the effects of non-gravitational forces
a two-body ephemeris program from JPL
Have a look to a README
file with more information on how to download and run the package.
There are compressed tar files with
the code and the required data files (try the Save option to download them):
A DOS executable version (eph.exe
zipped - 184 KB) is also available. The data files are available separetely
- 1.3 MB.
A large file including orbital elements
for more than 30.000 asteroids (1.4 MB) eph.tar.Z
or (1.5MB) eph.zip
A small file without asteroid
elements (140 KB) ephs.tar.Z
or (235 KB) ephs.zip
Some people has requested a file named DOSXMSF.EXE
required to run the DOS version.
FC - Depto.
Astronomia; Facultad Ciencias; Montevideo, Uruguay
Contact me at gonzalo_at_fisica.edu.uy
Tristan Narvaja 1674
Tel : (598-2) 41 80 04
Fax : (598 2) 42 19 57
to Instituto de Fisica