| Re: Orbital mechanics routines? [message #3920] |
Mon, 27 March 1995 04:54 |
zawodny
Messages: 121
Registered: August 1992
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Senior Member |
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In article <3kur0a$a2t@ra.nrl.navy.mil> nicholas@uap.nrl.navy.mil (Andy Nicholas) writes:
> I'm looking for routines that will give me lat/lon and radial distance
> from
> orbital parameters (inclination,apogee,perigee,...). Do they already
> exist somewhere or should I just take the plunge and code them up.
> Don't wanna re-invent the wheel.....
I have a suite of IDL routines with widget interface that do just what
you want and a whole lot more. Unfortunately, we have recently been
made aware here at NASA LaRC that there is a processess and set of
standards for the release of Gov't developed software. Since, I do
not want to write a users manual, I may not be allowed to release it.
I'll check in to it.
--
Joseph M. Zawodny (KO4LW) NASA Langley Research Center
Internet: j.m.zawodny@larc.nasa.gov MS-475, Hampton VA, 23681-0001
TCP/IP: ko4lw@ko4lw.ampr.org Packet: ko4lw@n4hog.va.usa.na
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| Re: Orbital mechanics routines? [message #3924 is a reply to message #3920] |
Sat, 25 March 1995 18:47  |
chris
Messages: 22
Registered: October 1994
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Junior Member |
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Andy Nicholas (nicholas@uap.nrl.navy.mil) wrote:
: I'm looking for routines that will give me lat/lon and radial distance
: from
: orbital parameters (inclination,apogee,perigee,...). Do they already
: exist somewhere or should I just take the plunge and code them up.
: Don't wanna re-invent the wheel.....
: Thanks,
: Andy
I wouldn't take the plunge just yet. There are a number of routines
availible related to astronomy in the Johns Hopkins Library, and
also in the Goddard Library (managed by Wayne Landsman) I don't
know exactly what you want, but I have written a routine which
drive the JPL Ephemeris & its fortran programs, from IDL. My
program gives you the 3-Vector position of the Sun Earth, and
Moon and All major planets, with respect to any other body
(Or the solar system barycenter). However it sounds like you
might want to input orbital elements of say, comets, and get
their positions. I don't have anything which does this.
Another option is to look for such aprogram in another language
C, or prefferably FORTRAN, and translate it. This is usually
much faster than writing it yourself, assuming you have some
knowledge of the other language, and that you can trust the
original code. Comparison is straight forward.
-Chris
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