Author Topic: LIVE: JAXA CubeSat deployment from JEM  (Read 63470 times)

Offline NASA_Aaron

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #20 on: 02/01/2012 11:12 pm »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Offline Space Pete

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #21 on: 02/02/2012 08:12 am »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Excellent, welcome to the site's forum. :)

I have some questions, if you have time:

1) What are the benefits of deploying cubesats from ISS, as opposed to hitching a ride on an LV?

2) Does deploying cubesats from ISS present any orbital debris/conjunction concerns to ISS? If so, how will they be mitigated?

Thanks!

Offline Ronsmytheiii

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #22 on: 02/02/2012 11:29 am »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Excellent, welcome to the site's forum. :)

I have some questions, if you have time:

1) What are the benefits of deploying cubesats from ISS, as opposed to hitching a ride on an LV?

2) Does deploying cubesats from ISS present any orbital debris/conjunction concerns to ISS? If so, how will they be mitigated?

Thanks!

And to add on to this, why not deploy the cubesats from a departing VV ala the recent Progress M-13M(45)? 

Great work by the way

Offline tul

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #23 on: 02/02/2012 12:50 pm »

1) What are the benefits of deploying cubesats from ISS, as opposed to hitching a ride on an LV?

Thanks!

JAXA wants to offer free launch opportunities for student's satellite projects on a regular way. The problem is, for FY 2012 there were no available launch vehicles beside the launch of the HTV. IGS is off-limit. (GCOM-W1 got delayed into FY 2012, but that one is already booked out). So the benefit is simply having a launch opportunity as opposed to have no launch opportunity.

Offline Danderman

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #24 on: 02/02/2012 03:40 pm »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Excellent, welcome to the site's forum. :)

I have some questions, if you have time:

1) What are the benefits of deploying cubesats from ISS, as opposed to hitching a ride on an LV?

2) Does deploying cubesats from ISS present any orbital debris/conjunction concerns to ISS? If so, how will they be mitigated?

Thanks!

And to add on to this, why not deploy the cubesats from a departing VV ala the recent Progress M-13M(45)? 

Great work by the way

Just a reminder that Progress M-13 raised its apogee by 100 km to facilitate deployment of Chibis. If VVs do not do so, orbital lifetime of deployed satellites will be very short.

Offline NASA_Aaron

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #25 on: 02/03/2012 03:12 am »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Excellent, welcome to the site's forum. :)

I have some questions, if you have time:

1) What are the benefits of deploying cubesats from ISS, as opposed to hitching a ride on an LV?

2) Does deploying cubesats from ISS present any orbital debris/conjunction concerns to ISS? If so, how will they be mitigated?

Thanks!

1) Our cubesat is being soft stowed in the pressurized storage of the HTV-3 vehicle.  This means significantly smoother ride to space.  The downside to this is that we have to go through the extremely strict Payload Safety Review Process for the ISS, which is harder than the interface control requirements for a regular launch vehicle. 

2) JSC and JAXA are performing conjunction analysis, and they have confirmed that there will be no recontact, we're responsible for our own orbital debris analysis.  Basically we have to ensure that we will remain in one piece (nothing ejected) throughout the duration of the flight, and that our ballistic coefficient is suitable to decay faster than the ISS.

Offline Fuji

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #26 on: 02/03/2012 07:00 am »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Great! I have a question regarding the communication experiment with Irridium or OrbComm.
I think this is the first time using inter-orbit communications such a small satellite.
Could you explain more detail?

Offline Space Pete

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #27 on: 02/03/2012 03:41 pm »
Thanks for the answers Aaron. Good luck with TechEdSat! :)

Offline NASA_Aaron

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #28 on: 03/20/2012 07:36 pm »
Awesome, I happened to google our project name and this thread came up! Thanks for finding (what I believe is) the first news article featuring TechEdSat!

I'm the Spacecraft Manager for TechEdSat, if you guys have any questions I'm subscribing to this thread.

Great! I have a question regarding the communication experiment with Irridium or OrbComm.
I think this is the first time using inter-orbit communications such a small satellite.
Could you explain more detail?

We're using the short burst data (SBD) modes of the two modems to transmit text message sized emails back to the ground, eliminating the requirement of a traditional satellite ground station.

Offline thuvt

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #29 on: 06/20/2012 03:50 am »
Hello everyone,
I'm Thu, the Project Manager for F-1 CubeSat. This is our first space mission so we are a little bit nervous but very excited. If there's any questions about our little bird I'll be happy to answer :)
Learn something new everyday

Offline Danderman

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #30 on: 06/20/2012 05:31 am »

Offline Space Pete

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #31 on: 06/20/2012 08:57 pm »
Hello everyone,
I'm Thu, the Project Manager for F-1 CubeSat. This is our first space mission so we are a little bit nervous but very excited. If there's any questions about our little bird I'll be happy to answer :)

Good luck with your project Thu! :)

Offline thuvt

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #32 on: 06/21/2012 02:50 am »
Good luck with your project Thu! :)
Thank you! The launch date is one month from now, and our little bird has just arrived at Tsukuba Space Center, waiting to be loaded in the J-SSOD together with other companion CubeSats. I hope that everything will go well as planned :)
Learn something new everyday

Offline Fuji

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #33 on: 06/21/2012 10:44 pm »
For reference. You can see the deploment order.

Offline thuvt

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #34 on: 06/22/2012 02:12 am »
Thank you Fuji for posting this. I've been told about the deployment order but it's always good to see the diagram.
Learn something new everyday

Offline Silmfeanor

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #35 on: 06/22/2012 09:22 am »
General question about this project - How long do you stay in orbit with a CubeSat launched like this from the ISS?
I know this depends on a number of factors, including solar wind, etc etc - but is there a minimum/maximum expected timeframe?
Weeks, months, years ( possible propulsion on board of the cubesats? )?

Any answers are greatly appreciated - and good luck to the people involved!
« Last Edit: 06/22/2012 09:23 am by Silmfeanor »

Offline thuvt

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #36 on: 06/22/2012 09:26 am »
Here's a rough estimation on orbital lifetime of a CubeSat without propulsion system deployed from the ISS:
- At 400km altitude: 250 days
- At 350km altitude: 100 days
« Last Edit: 06/22/2012 09:27 am by thuvt »
Learn something new everyday

Offline Skyrocket

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #37 on: 06/22/2012 10:41 am »
I simply do not understand, what the merits of this is.

Cubesats are usually deployed fro PPod dispensers (or similar), which can be strapped to nearly every launch vehicle upperstage without mich modification.

Why does JAXA carry these dispensers to the ISS, where a large mounting and handling structure is needed and where the manpower of the astronauts is needed, to deploy the cubesats. There are also no merits in having the cubesats on the station, as these are not serviceable in space (and Cubesats are cheap, so there is no point in servicing these in space).

It seems to me a rather big waste of resources, which could be utilized  much better.

Offline Space Pete

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #38 on: 06/22/2012 03:17 pm »
I simply do not understand, what the merits of this is.

Number one, launching CubeSats inside cargo vehicles, where they can be padded with foam etc, has a much lower vibration environment than mounting straight to a second stage. This means the CubeSats can be designed to cope with less stresses (and thus be cheaper), and also have more chance of making it to orbit alive.

Second, when mounting to a second stage, you are at the mercy of the launch date of the primary payload (primaries will not wait for secondaries) - so if you have development delays with your CubeSat and get bumped from your flight, it could be years before another rocket is available to your selected altitude and inclination. With ISS however, if your CubeSat is bumped from one flight, another one to the same orbit will soon follow due to the constant stream of ISS resupply flights.
« Last Edit: 06/22/2012 03:18 pm by Space Pete »

Offline Skyrocket

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Re: JAXA's Cubesat deploy plan from JEM
« Reply #39 on: 06/22/2012 03:31 pm »
I simply do not understand, what the merits of this is.

Number one, launching CubeSats inside cargo vehicles, where they can be padded with foam etc, has a much lower vibration environment than mounting straight to a second stage. This means the CubeSats can be designed to cope with less stresses (and thus be cheaper), and also have more chance of making it to orbit alive.

Cubesats are generally cheap and are also pretty robust.

Second, when mounting to a second stage, you are at the mercy of the launch date of the primary payload (primaries will not wait for secondaries) - so if you have development delays with your CubeSat and get bumped from your flight, it could be years before another rocket is available to your selected altitude and inclination. With ISS however, if your CubeSat is bumped from one flight, another one to the same orbit will soon follow due to the constant stream of ISS resupply flights.

Competely wrong - there are few flights available to ISS, as the material delivered in the pressurized cargo vehicles to ISS is a limited resource (both in mass and volume). Every cubesat flown is flown at the expence of material, which can be used and is needed on ISS.

On the other side, there are now plenty of flight opportunities on upper stages, where real spare performance can be used without cutting the real payload.

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