Re: Calculation of Iridium Flares

From: Johannes Bauer via Seesat-l <>
Date: Sat, 06 Jun 2015 21:40:58 +0200
Hi Alan,

On 05.06.2015 21:36, Alan Madill wrote:

> I don't know where you are with your project but I have been working
> away on a similar one for the last 4 months.  A couple of list members
> have been helping with the testing and have been providing some
> feedback.  I'm using Visual Basic for the application, C++ for the SGP4
> library, with Visual Studio Express 2013 as an IDE.  It's in the public
> domain and uses a fair bit of borrowed code.

Ah, very interesting. SGP4 was a keyword that got me a lot further, I
didn't know this was the de-facto standard model for artificial
sattelite movement.

> If you are interested take a look at it, you will find it at
> The source code is available on GitHub at

Very cool, thank you so much. Already cloned it.

> Feel free
> to download and try it.  The SGP4 engine is in a separate DLL that might
> be useful to you.  You will need the Visual Studio Express 2013 which is
> a free download.

The problem is that I have no Windows machines around here, everything
is running on Linux. But the source code is pure gold! From a first
glance it doesn't even to be too unwilling to compile under gcc (with a
few hacks here and there).

> The documentation is (of course) out of date.  I haven't done anything
> specific to do with flares but it would be a useful feature.  I'm about
> to start with the predict mode code.  It's been an interesting project
> and I would welcome feedback and/or co-developers.

Unfortunately, I have zero expericene with VB :-/ I'm trying to use
Python and I'm also only interested in command-line computation. Thanks
to your keyword I've also found this, which seems to be a almost literal
translation of the C++ source:

Very interesting indeed, all the source code seems to trace back to one
first source? Is there a paper that explains the equations that are used
in the SGP4 model a bit?

> I've got a little bit more to do with the user option screens before I
> re-announce it on the SeeSat-L list.  I think I have it to the point
> where it is a useful tool.  However it will be a long time in
> development before it is a feature rich as something like HeavenSat.

Yes, I do know what you mean. It's also just a hobby project for me and
progress can be pretty slow. I'm mainly just interested in learning how
this stuff works. So we'll see how it all ends up.

> Is this you?

It is not, but I'm pretty sure that I've been in touch with Johannes on
one occasion (we were confused for each other). That said, "Johannes
Bauer" is about the German equivalent of "John Wilson" or something like
that, pretty common.

Best regards,

Seesat-l mailing list
Received on Sat Jun 06 2015 - 14:41:47 UTC

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