The Orbital and Celestial Mechanics Web Site
What’s New
To upgrade purchased software, simply download
the zipped file again and extract the new or updated contents using the
password provided with the original purchase.
March 10, 2010
The executable program and PDF documentation
for Rise and Set of Earth Satellites
has been uploaded to the Freeware section.
March 8, 2010
The source code and PDF documents for A MATLAB Script for
Preliminary Earth-to-Mars Mission Design and A MATLAB Script for Preliminary Earth-to-Mars
Interplanetary TCM Optimization have been updated in the Interplanetary
Mission Analysis section.
February 28, 2010
The executable program, three example input
files and documentation for A Computer
Program for Converting Between True-of-Date and
EME2000 Coordinates” which uses subroutines from NOVAS 3.0 has been
uploaded to the Freeware section.
February 27, 2010
The executable program, An Initial Guess Generator for Lunar Mission Analysis, in the Lunar Mission Analysis
section is now freeware.
The executable program, A
Computer Program for Gravity-assist Trajectory Design and Analysis, in the Interplanetary
Mission Analysis section is now freeware.
February 24, 2010
The executable program, A
Computer Program for Patched-Conic Trajectory Design and Optimization, in the Interplanetary
Mission Analysis section is now freeware.
February 21, 2010
The executable program, several example input
files and documentation for “Partial Coverage Constellation Design and Analysis”
has been uploaded to the Freeware section.
February 17, 2010
Added two technical reports in PDF format to
the Technical Reports section.
SAO Special Report No.
223, “The Short-period Drag Perturbations of the Orbits of Artificial Satellites”,
by L. Sehnal and Sara B. Mills.
SAO Special Report No. 234, “Note on
Expressions for Second-period Short-periodic Perturbations”, by Yoshihide Kozai.
February 16, 2010
The executable program, several example input
files and documentation for “Closest Approach Between
the Earth and Heliocentric Objects” has been uploaded to the Freeware
section. Please note that the DE405
option has be replaced with a DE421 ephemeris option. An input data file for the asteroid Apophis is provided.
Current simulations are predicting a close approach to the Earth of less
than 40,000 kilometers on April 13, 2029.
November 11, 2009
The
executable for the “Closest Approach Between a
Spacecraft and Celestial Body” computer program is now available as freeware. It
can be found in the Interplanetary Mission Analysis section.
November 8, 2009
The
executable for the “Closest Approach Between a
Spacecraft and the Moon” computer program is now available as freeware. It
can be found in the Lunar Mission Analysis section.
November 6, 2009
The
PDF document for the application, “A Matlab Script
for Parametric Analysis of Minimum TLI Delta-V, Two-Body Lunar Transfer
Trajectories” has been updated. It can
be found in the Lunar Mission Analysis section.
The main script and several support functions have also been updated.
September 3, 2009
Added
a PDF document, “The Laplacian and Gaussian Orbit
Methods” by Samuel Herrick to the Technical Reports section.
July 4, 2009
Added a Numerit program that
performs a primer vector analysis of coplanar Hohmann
transfers to the Orbital Mechanics with Numerit
section. A
PDF document that describes this application is also included.
July 2, 2009
A
link for downloading the INPOP08a binary ephemeris file has been added to the
Orbital Mechanics with Matlab and the Orbital
Mechanics with Fortran pages.
June 22, 2009
A
new program that demonstrates phasing analysis of coplanar Hohmann
transfers has been added to the maneuvers section of Orbital Mechanics with Fortran.
June 20, 2009
The
following demo programs have been updated in the Orbital Mechanics with Fortran section: griseset.zip,
frozen2.zip, g3body.zip and grmotion.zip. The updates are mainly in the graphics area
of each demo program. A new program that
demonstrates a primer vector analysis of coplanar Hohmann
transfers has also been added to the maneuvers section of Orbital Mechanics
with Fortran.
June 15, 2009
June 4, 2009
A MATLAB script that performs a phasing/rendezvous
analysis between two coplanar circular orbits has been added to the Maneuvers
section of the Orbital Mechanics with Matlab
suite. The PDF document for the
Maneuvers software suite has been updated.
June 1, 2009
Added a graphical primer vector
analysis to the lambert1 script of the Orbital Mechanics with Matlab suite. Also added a Lambert
function due to Geza Gedeon
to the suite. FreeMat
versions are also available.
Updated A MATLAB Script for
Ballistic Interplanetary Trajectory Design and Optimization to include an
asteroid or comet as one of the celestial bodies.
May 31, 2009
Added a new Matlab
script to the Interplanetary Mission Analysis page. The script is a Differential Evolution version
of A MATLAB Script for Ballistic Interplanetary Trajectory Design and
Optimization.
The Optimal Orbital Transfer Analysis Matlab script has been updated to include a graphical
primer vector analysis of two impulse transfer trajectories. The PDF document has been updated.
May 30, 2009
Added a primer vector Matlab script to the Maneuvers part of the Orbital
Mechanics with Matlab suite. This script performs a graphical primer
vector analysis of coplanar Hohmann transfers. Updated the Maneuvers PDF
document. A FreeMat
version of this script has been added to the Orbital Mechanics with FreeMat software suite.
April 20, 2009
Added several scripts, functions and output text
files that demonstrate the use of the JPL MICE software to the Downloads section
of the Orbital Mechanics with Matlab page.
April 19, 2009
Added a link for downloading the
INPOP binary ephemeris file from within the Orbital Mechanics with Matlab page.
April 8, 2009
Added three PDF documents related to lunar
coordinate transformations to the Lunar Mission Analysis section.
November 24, 2008
Added many new sites and companion
links to the Useful Links page. Organized the links into
sections (Organizations, Software, Publications, etc.)
November 19, 2008
Added a Fortran version of
Scott Campbell’s routine that converts an ECI state vector to a two line
element set (TLE) to the Orbital Mechanics with Fortran software suite. A demo program can be found in the Utility
section of the web page.
November 10, 2008
Added several new sites and
companion links to the Useful Links page.
October 24, 2008
Added a “HOW TO SPECIFY THE EPHEMERIS TO USE” explanation to the ephemeris.html file
found in the Orbital Mechanics with Fortran website.
October 19, 2008
Fixed
link to frozen2.zip on the Orbital
Mechanics with Fortran page.
Added link to GMAT – General Mission Analysis Tool
on the Useful Links page.
August 13, 2008
Added
a PDF version of the Long-term Orbit Predictor (LOP) user’s manual to the
technical reports area. This is JPL Publication
EM 312/86-151 dated June 30, 1986.
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