The OrbFit software system is
growing in complexity and scope: to keep up with this growth, this web
site also needs to be restructured. Please be patient while
work is in progress.
OrbFit has undergone another major upgrade.
The version 5.0 results from the merge of the previous
operational version 4.2, including the new astrometric error model and
various other improvements, with the version 4.3 which has never been
distributed because was under test. In practice, the capabilities from
4.3 which have been incorporated include the capability to determine
the semiempirical parameters appearing in the non-gravitational
perturbations on asteroids, such as the direct radiation pressure, the
Yarkovsky effect, and cometary outgassing. Thus covariance matrices
can be up to 10x10, rather than just 6x6. Of course solution without
non-gravitational parameters are still possible, but please note that the format for the
orbits and covariances has been updated to make room for the new
dynamical parameters and their uncertainties.
OrbFit is divided into
|Requirements||The software we are providing has been developed under LINUX and is distributed in a package allowing for automatic compilation on whatever target computer with a LINUX operating system; compilation is possible under the free Fortran95 compiler gfortran, although we mostly use the commercial compilers Intel and Lahey.|
|The OrbFit Consortium||
The idea of creating the OrbFit software came from Prof. Andrea Milani
Comparetti (University of Pisa, Italy), who developed most of the
algorithms and wrote a large part of the code.
Other authors of the OrbFit software are scientists working in the field
of celestial mechanics, with specific experience of dynamics and orbit
determination for both natural celestial bodies (asteroids, comets,
satellites, planets) and artificial spacecraft (satellites,
The OrbFit software has been created, and is currently being
maintained and expanded, by a Consortium of researchers working in
Currently the OrbFit Consortium has the following Board of Directors:
Questions about this software can be addressed to
orbfit [at] adams.dm.unipi.it