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From: Dan on 17 Jun 2010 02:04
I was wondering if anyone could point me toward a Mathematica based
code or a package, commercial or otherwise, that can compute a
ballistic launch trajectory. I am envisioning something that provides
position, velocity, and acceleration state vectors as a function of
time in an earth centered inertial frame. Ideally, this would make use
of a standard gravitational model such as the one used in SGP4. I have
ported SGP4 to Mathematica, and I would like to add this function to
my tool suite.

Thanks in advance,
Dan Flatin

From: Chris Pemberton on 18 Jun 2010 01:24
On 06/17/2010 01:04 AM, Dan wrote:
> I was wondering if anyone could point me toward a Mathematica based
> code or a package, commercial or otherwise, that can compute a
> ballistic launch trajectory. I am envisioning something that provides
> position, velocity, and acceleration state vectors as a function of
> time in an earth centered inertial frame. Ideally, this would make use
> of a standard gravitational model such as the one used in SGP4. I have
> ported SGP4 to Mathematica, and I would like to add this function to
> my tool suite.
>
> Thanks in advance,
> Dan Flatin
>
>
Darn it Kim Jong-il, is that you? I told you _never_ contact the list
members; just lurk and learn. Anyway, it's all in that thumb drive I
sent you last summer; look in the "Family Vacation Pics" folder.

Yours,

V. Putin

From: Christopher Arthur on 18 Jun 2010 01:26
did you look at the astronomy package?

Dan a =E9crit :
> I was wondering if anyone could point me toward a Mathematica based
> code or a package, commercial or otherwise, that can compute a
> ballistic launch trajectory. I am envisioning something that provides
> position, velocity, and acceleration state vectors as a function of
> time in an earth centered inertial frame. Ideally, this would make use
> of a standard gravitational model such as the one used in SGP4. I have
> ported SGP4 to Mathematica, and I would like to add this function to
> my tool suite.
>
> Thanks in advance,
> Dan Flatin
>
>
>


From: Christopher Arthur on 19 Jun 2010 07:46
Yes it is a little bit suspicious.

Chris Pemberton a =E9crit :
> On 06/17/2010 01:04 AM, Dan wrote:
>
>> I was wondering if anyone could point me toward a Mathematica based
>> code or a package, commercial or otherwise, that can compute a
>> ballistic launch trajectory. I am envisioning something that provides
>> position, velocity, and acceleration state vectors as a function of
>> time in an earth centered inertial frame. Ideally, this would make use
>> of a standard gravitational model such as the one used in SGP4. I have
>> ported SGP4 to Mathematica, and I would like to add this function to
>> my tool suite.
>>
>> Thanks in advance,
>> Dan Flatin
>>
>>
>>
> Darn it Kim Jong-il, is that you? I told you _never_ contact the list
> members; just lurk and learn. Anyway, it's all in that thumb drive I
> sent you last summer; look in the "Family Vacation Pics" folder.
>
> Yours,
>
> V. Putin
>
>
>


From: Daniel Flatin on 22 Jun 2010 07:00
On 2010-06-18 01:24:38 -0400, Chris Pemberton said:

> On 06/17/2010 01:04 AM, Dan wrote:
>> I was wondering if anyone could point me toward a Mathematica based
>> code or a package, commercial or otherwise, that can compute a
>> ballistic launch trajectory. I am envisioning something that provides
>> position, velocity, and acceleration state vectors as a function of
>> time in an earth centered inertial frame. Ideally, this would make use
>> of a standard gravitational model such as the one used in SGP4. I have
>> ported SGP4 to Mathematica, and I would like to add this function to
>> my tool suite.
>>
>> Thanks in advance,
>> Dan Flatin
>>
>>
> Darn it Kim Jong-il, is that you? I told you _never_ contact the list
> members; just lurk and learn. Anyway, it's all in that thumb drive I
> sent you last summer; look in the "Family Vacation Pics" folder.
>
> Yours,
>
> V. Putin

Chris, that was hilarious! But for those of you who may not know, SGP4,
used by NORAD to maintain their satellite database, is a well
documented satellite trajectory propagation algorithm. Actually, it is
just one of a family of algorithms, all tuned to different
gravitational regimes. If you are interested, take a look at David
Vallado's Fundamentals of Astrodynamics and Applications. Code for SGP4
is available online in various languages (just not in Mathematica) at

http://celestrak.com/software/vallado-sw.asp

Note that I am aware of STK (http://www.stk.com), but I am interested
in doing as much of the problem at hand from within Mathematica, and I
don't particularly like using black box software tools for this sort of
thing.

I am still finding my way around this topic. I sincerely appreciate all
the good responses I have received.

Dan


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