[Ground-station] Ground-Station Digest, Vol 20, Issue 10

[Thomas Parry]

Hi Michelle,

Concerning the orbit, I uploaded a document to the Slack showing that the
Busek does not have sufficient thrust to meet GTO to GEO in a realistic
time frame (39 years).  Going from LEO to GEO would be even worse
increasing the required delta V by a factor of 2.4 - so 93 years to
circularise the orbit.  I have attached the calculations to this email.

I would think a trade study of available thrusters is a good place to
start.  The pace of propulsion development in the last few years has been
intense and there are now thrusters on the market that achieve reasonable
timeframes to circulise (less than a month).

Cheers,
Thomas

On Tue, Nov 19, 2019 at 8:30 PM
<ground-station-request at lists.openresearch.institute> wrote:

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>    1. Document in progress, opening it up to further review
>       (Michelle Thompson)
>
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 19 Nov 2019 11:27:47 -0800
> From: Michelle Thompson <mountain.michelle at gmail.com>
> To: Michelle Thompson via Ground-Station
>         <ground-station at lists.openresearch.institute>
> Subject: [Ground-station] Document in progress, opening it up to
>         further review
> Message-ID:
>         <
> CACvjz2Vx2-iv4XaKU8-jJvowsmVnVowFP3LqCsiYrsEWMZ-AhQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Here's a document and initial review input.
>
> Please read and reply if this is in your area of expertise or interest.
>
> -Michelle W5NYV
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-
> Reviewer 1:
> I think this might be better as three documents. The first would be a
> master to-do list, not trying to be a comprehensive planning document but
> just a bullet list of specific tasks that have been written up. Sort of a
> ?job jar?. This would be a living document, with tasks being added as they
> are written up and checked off as task teams make progress and either
> complete the task or spin off their own more detailed planning efforts. It
> would start out with just two items, with links to the other two documents:
> one for orbit concept studies and one for subsystem 3D models.
>
> These would all start out as short documents, and I think that?s ok.
>
> ?There are limited launch opportunities for this but ~40kG is not
> excessive.? I don?t know what the 40 refers to, why it?s not excessive,
> with respect to what. Needs some explanation. I assume you mean a mass, in
> which case it should be kg, not kG (kiloGauss).
>
> Longtime space hams will be familiar with the term GTO, geostationary
> transfer orbit, which was one of the steps into the Phase 3 Molniya orbits.
> It would be good if the orbit studies document explained the relationship
> between that orbit concept and the ones under consideration here.
> -=-=-=-=-=-=-=-=-=-=-=-=-=-
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