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A real satellite project?

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8:05 am
January 13, 2010


Luke Maurits

Adelaide, Australia

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Here's a very tentative suggestion (or more of a question, really, I'm not super invested in it) about another project.

First of all, I am very aware that "project bloat" would be a bad thing.  We are so small right now that we can't really even handle two projects (whenever things are going well for CLLARE, OHKLA is stagnant and vice versa).  I don't want us to go mad starting up projects we don't have the infrastructure to handle.

That said, at the same time I have come to realise that maybe we can do a lot of really good work much faster than previously thought.  For some reason, a lot of our early planning seems to have completely ignored the possibility of using commercial launch vehicles.  There's been a mentality that we'll need to build ourselves a small sounding rocket, then build up to something from that which can put a microsatellite into LEO, then build that up, etc., etc.

Now, let me be clear:  I would love for us to eventually develop our own launch vehicle technologies and I think we should try to do it.

But, if we limit ourselves at any time to only projects that we can launch ourselves, we're going to waste a lot of time where we could be very productive.  We'll be playing with microsatellites at best for years.  Now, we've already warmed up a lot to the idea of launching the CLLARE stack onboard a Falcon 9.  Well, the Falcon 1 can put 420 kg into LEO for $8.9 million, today.  Why not do projects using commercial launchers while we are busy developing our own launchers?

Why don't we consider designing a satellite of some kind to be launched on a Falcon 1?

There was an idea mentioned a long time ago about an open source space telescope.  That's something we could probably plan and it would be a piece of cake compared to CLLARE.  No life support, no large propulsion once in space – basically just a telescope of some kind, a solar power system, a cold gas RCS and a communication system.  We could sell time on it to fund ourselves: for $1000 an hour, people can point the telescope wherever they want and the results are CC licensed.  This is a much less expensive or ambitious project than CLLARE, but would still produce useful experience for CLLARE (especially comms experience), and is far less trivial than OHKLA.  It's also 100% practical:  this is the kind of thing that astrophysics departments from respectable universities could actually throw their weight behind without appearing crazy.

Thoughts?

Main CLLARE workgroups: Mission Planning, Navigation and Guidance. I do maths, physics, C, Python and Java.

9:29 am
January 13, 2010


brmj

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I don't think I'd be opposed to such a thing once we've completed OHKLA. We'd have to see just how cheap we could make it and how much we could sell teliscope time for. We may want to use gyros rather than cold gas so it could last longer.

For the mirror, I have a potentially crazy idea to make it cheap and high quality: use a liquid mirror, with electorstatic force serving as a stand in for gravity.

Main work groups: Propulsion (booster), Spacecraft Engineering, Computer Systems, Navigation and Guidance (software)

5:00 pm
January 13, 2010


Rocket-To-The-Moon

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Post edited 11:03 pm – January 13, 2010 by Rocket-To-The-Moon


The first thing that came to my mind was that this would be spreading us even more thin than we are now. With our current membership we have no way of supporting a third complex project. The idea of an open source space telescope is a fine idea and I support it, but only if we make a real effort to contact universities so that they can develop the hardware (presumably organized through CSTART). I don't realistically expect that the telescope would even remotely approach Hubble in terms of resolving power so it can't compete directly with that. It needs to offer something that ground based telescopes can't. With modern adaptive optics ground based telescopes can overcome much of the thermal protuberances in the atmosphere (therefore able to produce sharp images) but they still can't see the part of the spectrum that is absorbed by the atmosphere. Therefore, any telescope that is developed would need to perform observations outside of visible or radio wavelengths.

See Atmospheric Window

RCS is a suboptimal way to point a space telescope. Telescopes do need RCS for orbit maintenance and for canceling out unwanted angular momentum (as a result of reaction wheel friction). Any satellite that needs to maintain a fixed gaze employs reaction wheels. A reaction wheel uses the conservation of angular momentum to cause the spacecraft to spin in the opposite direction of the wheel. If you have a reaction wheel with a mass of .5kg and a satellite with a mass of 1000kg, turning the reaction wheel .1º in one direction will cause the 1000kg mass to turn (sorry, not a mathematician)º in the opposite direction. In other words, reaction wheels can produce extremely fine control of an object.

Basically, I like the idea, but I don't think we can do it unless we get universities to take charge of it.

Main Workgroups: Propulsion & Spacecraft Engineering

5:25 pm
January 13, 2010


Luke Maurits

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I certainly had a non-optical telescope in mind, to maximise its usefulness.  We actually have had a few people show up on the board who either have or have started astrophysics degrees, I'm sure they could give us advice on what part of the spectrum might be the most useful/interesting.

I also have no delusions about getting anywhere close to Hubble's performance.  Something considerably less powerful, but open to be used by academics, amateur astronomers and as a teaching resource astronomy students, would still be hugely succesful, I think.

Reaction wheel control is fine by me, I didn't realise RCS was so inappropriate for a telescope.  Whatever works best is what we should go with.

We would definitely need a larger userbase to support this kind of thing, but part of the appeal of such a project is that recruitment should be easier.  CLLARE has a stigma about it of being too unrealistic, a project for dreamers.  It's also complicated, with lots of subsystems that few people could hold all in their head at once.  An open source space telescope wouldn't be like that.  I think we could pick people up from /r/space and from universities pretty easily and there's not that much to discuss so we could keep the group tightly focussed.

Maybe we could at least write something up explaining our interest in doing this and solicit feedback from /r/space.  We might get a good response.  If it was clear that there would be a lot of people out there who would be interested, I don't see why we would have to wait until after OHKLA to do this, since there is no technical dependence.  This project could be a good way to generate awareness of CSTART, and getting real partnerships going with real universities would make us look quite respectable.

Main CLLARE workgroups: Mission Planning, Navigation and Guidance. I do maths, physics, C, Python and Java.

9:15 pm
January 13, 2010


Luke Maurits

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Post edited 3:16 am – January 14, 2010 by Luke Maurits


Here's something interesting that's very relevant to what we are discussing here.  I haven't been able to find much authoritative information on the project, what I'm pasting below is taken from a mailing list.

Hi all,

I know this is an old topic, but I just returned from vacation. The
Amateur Space Telescope was a project run in the 80's by students
and faculty at Rensaeller Polytechnic Institute (RPI) in Troy, NY and
the University of Rochester in Rochester, NY. The AST was to fly
in a "get-a-way special" (GAS) canister on the shuttle. I don't know for
sure, but I believe the shuttle explosion effectively ended the GAS
program, thus ending the AST program.

The GAS program offered low cost launches as add-on cargo during a
mission dedicated to other programs. The GAS canisters were small
cylinders with just a few feet square of volume, lightweight, and with limited
power. Also, orbit choices were limited (they had to be reasonably close to
the orbit of the main shuttle payload of which they were a part because any
additional thrust or propulsion components had to fit within the same GAS
canister as the AST). The AST had to be designed to work within those limits.

I believe that construction proceeded quite far on engineering mock-ups
and test platforms. I don't believe the final vehicle was ever built, nor were
optics ever made.

I could be very wrong about any of this. My involvement was only vicarious
(a friend of mine at that time was a student-member of the AST team). Maybe
there are parts still in existence? Maybe we can find a member of that team
with more information? Resurrecting the AST would be a great boon to
amateurs and professionals alike.

Although this was apparently an optical telescope, tracking down people who were involved in this project might be a good and easy way to quickly build up a competent team to work on a new CSTART open source telescope.  Importantly, I notice that one of the universities involved was in Rochester, which is where brmj is.  It may even be the same university brmj is attending!  If he were interested he may be able to ask around to find people who were involved and chat to them face to face.

I'm really starting to feel like getting enough support for us to be able to manage this project may be fairly achievable.

Main CLLARE workgroups: Mission Planning, Navigation and Guidance. I do maths, physics, C, Python and Java.

9:27 pm
January 13, 2010


Rocket-To-The-Moon

Altus, Oklahoma, USA

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There could definitely be professors who remember this project. RIT would be a prime candidate for a participating university. Finding other universities to participate could be made easier through academic channels.

Main Workgroups: Propulsion & Spacecraft Engineering

9:49 pm
January 13, 2010


Luke Maurits

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Absolutely.  If a few professors at RIT were onboard word would pretty quickly spread to other universities.  Chances are any decent sized university should have at least one and possibly several grad students who would be excited to help out.  Some of them may eventually come to also work on CLLARE (or at least spread word of CLLARE to fellow students from engineering, etc.).

Main CLLARE workgroups: Mission Planning, Navigation and Guidance. I do maths, physics, C, Python and Java.

1:20 am
January 14, 2010


Rizwan

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Although the idea of space telescope is very appealing. I am afraid we are adding projects faster than we are able to add members. Maybe once we have good member base, we can take care of this kind of stuff.

Also it will be bad PR if we keep adding projects and none of them materialise.

3:40 am
January 14, 2010


Luke Maurits

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Rizwan said:

Also it will be bad PR if we keep adding projects and none of them materialise.


This is very true.  I think we should approach this idea slowly – see if we can find people from the old project and see if they are still interested and can agree on what sort of telescope would be most useful today.  We could try to get rough numbers of likely interested students etc. and not actually name/announce the project until it was clear there would be enough interest to support it.

Main CLLARE workgroups: Mission Planning, Navigation and Guidance. I do maths, physics, C, Python and Java.

7:42 pm
January 15, 2010


brmj

Rochester, New York, United States

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Luke Maurits said:

Although this was apparently an optical telescope, tracking down people who were involved in this project might be a good and easy way to quickly build up a competent team to work on a new CSTART open source telescope.  Importantly, I notice that one of the universities involved was in Rochester, which is where brmj is.  It may even be the same university brmj is attending!  If he were interested he may be able to ask around to find people who were involved and chat to them face to face.


It's not my university, but I can get in touch with them if we decide we are interested in this project.

Main work groups: Propulsion (booster), Spacecraft Engineering, Computer Systems, Navigation and Guidance (software)

7:44 pm
January 15, 2010


brmj

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Rizwan said:

Although the idea of space telescope is very appealing. I am afraid we are adding projects faster than we are able to add members. Maybe once we have good member base, we can take care of this kind of stuff.

Also it will be bad PR if we keep adding projects and none of them materialise.


Good points. I would suggest only taking on this project once we are done with OHKLA, and only then if we can get significant outside support.

Main work groups: Propulsion (booster), Spacecraft Engineering, Computer Systems, Navigation and Guidance (software)

4:36 pm
January 16, 2010


Rocket-To-The-Moon

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brmj said:

Rizwan said:

Although the idea of space telescope is very appealing. I am afraid we are adding projects faster than we are able to add members. Maybe once we have good member base, we can take care of this kind of stuff.

Also it will be bad PR if we keep adding projects and none of them materialise.


Good points. I would suggest only taking on this project once we are done with OHKLA, and only then if we can get significant outside support.


These are my feelings also. I just don't think we can support this project at the moment.

Main Workgroups: Propulsion & Spacecraft Engineering

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