Author Topic: CubeSat and NanoSat Technology  (Read 106032 times)

Offline jongoff

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Re: CubeSat and NanoSat Technology
« Reply #260 on: 08/29/2018 09:54 PM »
Smallsats and cubesats for planetary missions BLEO.

www.sciencemag.org/news/2018/08/tiny-spacecraft-are-breaking-out-earth-s-orbit

We just presented our paper (mentioned in the depot thread in this NSF category) on using micro depots to enable smallsat launch vehicles to do dedicated deep space launch. I'll link to the article and the writeup in another thread once we've put our finishing touches on it, but it's relevant to this planetary/BLEO smallsats discussion--we were getting results suggesting you could use a LauncherOne (refueled on-orbit with a dry-launched/LEO-fueled storable biprop kick stage) to send an 90-450kg net payload almost anywhere in the inner solar system, out to Jupiter.

~Jon
The alternative to refuelling is to deliver earth departure stage on separate flight, rendezvous in orbit and move satellite to earth departure stage. Mission complexity is not lot different, still need to rendezvous, just trade between swapping fuel and payload(satellite).

If done at an unmmanned robotic station, then robotic capabilities of station could help reduce risk. Checkout the satellite before sending BLEO or do minor repairs. The station would also allow for assembly of satellite, eg add large lite weight solar array built at station.

First, in order to get a full stage in this case, you'd need a much bigger launcher--(LauncherOne payload to LEO is like 475kg, a fully-fueled LauncherOne stage is over 2500kg). Second, I really have a hard time believing swapping stages is going to be easier than propellant transfer. The Russians have been doing non-cryo transfer since long before I was born, and cryo transfer is only a little bit harder, but also rapidly increasing in TRL. But we should probably take more discussions on depots themselves over to the depot thread.

~Jon
« Last Edit: 09/16/2018 05:21 AM by jongoff »

Offline TripleSeven

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Re: CubeSat and NanoSat Technology
« Reply #261 on: 08/29/2018 09:58 PM »
Smallsats and cubesats for planetary missions BLEO.

www.sciencemag.org/news/2018/08/tiny-spacecraft-are-breaking-out-earth-s-orbit

We just presented our paper (mentioned in the depot thread in this NSF category) on using micro depots to enable smallsat launch vehicles to do dedicated deep space launch. I'll link to the article and the writeup in another thread once we've put our finishing touches on it, but it's relevant to this planetary/BLEO smallsats discussion--we were getting results suggesting you could use a LauncherOne (refueled on-orbit with a dry-launched/LEO-fueled storable biprop kick stage) to send an 90-450kg net payload almost anywhere in the inner solar system, out to Jupiter.

~Jon

curious...so to do this would the stratolaunch airplane be "better"...two launches at "near the same time" one carries the payload and the other "prop"...or use launcher one and two launches at a short interval?

I am just asking?

Offline TrevorMonty

Re: CubeSat and NanoSat Technology
« Reply #262 on: 09/13/2018 05:25 PM »
spacenews.com/gapsat-places-geo-smallsat-order-with-terran-orbital/

GEO comms smallsat, no size given but Terran Orbital specialize in 10-100kg cubesat and smallsats. Being delivered direct to GEO by LV, which is unknown at present.

With likes of Made In Space and SSL working ways to add lite weight solar arrays and large radio reflectors in orbit.  Smallsats could make large in roads into GEO market. They are also getting their own range of dedicated LVs from 200-1250kg (LEO) some of which with right 2nd or 3rd stage could deliver few 100kgs direct to GEO.
« Last Edit: 09/13/2018 05:33 PM by TrevorMonty »

Online gongora

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Re: CubeSat and NanoSat Technology
« Reply #263 on: 09/13/2018 05:34 PM »
spacenews.com/gapsat-places-geo-smallsat-order-with-terran-orbital/

GEO comms smallsat, no size given but Terran Orbital specialize in 10-100kg cubesat and smallsats. Being delivered direct to GEO by LV, which is unknown at present.

It doesn't explicitly say the LV will put it in GEO (it's possible for a larger sat to carry smaller sats to GEO).  If it is going directly to GEO on the LV I'd guess it would be on a Russian rocket?  Who else really offers that?

Offline TrevorMonty

Re: CubeSat and NanoSat Technology
« Reply #264 on: 09/13/2018 10:21 PM »
spacenews.com/gapsat-places-geo-smallsat-order-with-terran-orbital/

GEO comms smallsat, no size given but Terran Orbital specialize in 10-100kg cubesat and smallsats. Being delivered direct to GEO by LV, which is unknown at present.

It doesn't explicitly say the LV will put it in GEO (it's possible for a larger sat to carry smaller sats to GEO).  If it is going directly to GEO on the LV I'd guess it would be on a Russian rocket?  Who else really offers that?
Here is quote.  After reading it again not quite sure what they mean.

GapSat-1 will launch in the third quarter of 2020 directly into the geostationary arc 36,000 kilometers above the Earth, according to the company.

Offline TrevorMonty

Re: CubeSat and NanoSat Technology
« Reply #265 on: 09/16/2018 01:12 AM »


techcrunch.com/2018/09/14/california-is-launching-our-own-damn-satellite-to-track-pollution-with-help-from-planet/?guccounter=1

California state have commissioned pollution detecting 6U? cubesat that Planet will build and operate for them.
Not stated, but Planet may also do data analysis.




Offline TrevorMonty


Offline TrevorMonty

Re: CubeSat and NanoSat Technology
« Reply #267 on: 11/08/2018 04:06 PM »
Cubesat water tanker demo mission.

spacenews.com/orbit-fab-to-test-refueling-technology-on-iss/

There are a few companies offering thrusters that use water, Tethers Unlimited and DSI to name two. I think both are flight ready if not flying. 

With in orbit refuelling not only can life of cubesat be extended it also opens up more mission options.
1) fly lower giving higher resolution images eg move from 500km to 250km doubles resolution. Cubesat deorbits in months in case of failure not years.
2) retrieval vehicles to remove debris and dead satellites.
3) have tankers stationed at higher orbits eg GTO or EML1 to allow cubesats to go BLEO without requiring much more than 2kms DV.


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