ROSA was pushed slightly retrograde from ISS, so its orbital period (time it takes to go around Earth) is now very slightly less than ISS. So since this was an impulsive maneuver ROSA's orbit still intersects the orbit of ISS, but the phase difference means they shouldn't intersect again for years -- long enough for ROSA to de-orbit on its own due to effects of atomic oxygen still present at that altitude. Right? Or I'm wrong and ROSA has some delta-V and can de-orbit itself, maybe?
mspencer712 No, it's not moving nearly fast enough to have any meaningful change in altitude. something that light and with that much surface area will de-orbit rather quickly.
But why would a satellite need to retract its solar array? They wanted it to retract here for cleaner disposal, that's all. If it didn't, I don't think it impacts the end goal for that solar array.
I do not know the reason behind its development; but normal solar panels are not designed to retract after they are deployed because they do not need it in space. -> This could be usefull for things that would use the upper atmosphere for aerobraking or had to pass through the "coma" of a comet or a gas giant planet´s rings.
1) They didn't mean to, it was meant to fold back and be placed in Dragon's trunk, which would have been jettisoned after a deorbit burn. 2) Something with such a high drag coefficient in such a low orbit (400 km) isn't going to stay there for more than a couple years. 3) Space debris are mostly a problem between 600-1000 kms up. Because of atmospheric drag, there aren't much spacecraft or debris at the ISS's altitude.
ROSA is succesful because it tested a deploy method using High Strain Composite materials to push something as heavy as that Sollar Array "blanket" in such lenght/manage to maintain shape/produce current out of it etc. Simmilar deploy is and will be even more widely used because it has very small volume in packed configuration. See simmilar tech here /watch?v=ORc6DqYUytg (very useful even for cube sats). Retract could be cool/useful but not the most important part.
Imagine some rich astroid mining CEO a century later put this on a public exhibition amongst all of his private space collectables; on some orbital hotel....
there goes your years of work. is there any reason to not just keep it? and what does the PI say to this? will them attempt another test of a second ROSA before Demonstration? and why fly to station if this could have been done by any other satellite with multiple video downlinks?
@MrVipitas You've written rubbish. It was the end of a successful test - read the video introduction where it's all explained. The panel was to be rolled up & burned during Dragon reentry anyway.
it was a technology demonstration hardware. it was mean to go up, let scientists collect data ned then it would get disposed. the data was the product not the hardware. the hardware was worth very little, the bulk of the money gets spent on the research and figuring out how to make something. knowledge of how to make something is worth a lot. a scale copy of it is worth very little.
btw, station is a platform, you can send hardware and attach it to station. station would do all the management, control, communication and everything else. so, it's actually cheaper to send test hardware to station than to send it out on a separate craft that will need a full independent spacecraft as well as all the ground support that goes with it. station also has a large mass which was useful for vibration testing.
Just one more example of why a shuttle type vehicle is needed. ROSA would have been brought back down for examination, instead of being just thrown away.
@Soren so, by that logic, if I buy 5 liters of water and use it in a chemical experiment, get my valuable data and end up with water as side product, then I have to drink the water because disposing it is a waste of water? how dense can you be? the panel was a small scale prototype, it wasn't designed for long term use, it was too small to be useful for ISS. and the main users of it in the future are meant to be satellites not ISS. as the mission profile suggest, it was a tech demo, the value was on the data that was collected not in the hardware
But if we already have gotten all we paid for, is that a waste? It was a solar panel, they are inexpensive, specially the roll-out ones, which is part of the appeal of this project. If they were disposing of a functional craft or a rover... Then maybe I would be on your side.
How about these agencies stop with their lies and open up about the truth. Then spend all the money they would have used for lies to build infrastructure and education to the people in these underdeveloped nations.
You can fool some of the people some of the time But not ALL of the people All of the time. :) Oh BTW Im not a Flat Earther I just KNOW film & something in this gave you away :) I'll leave it for others to see for themselves
I would have taken that if you guys didn't want it. :)
It's free for pick up. First come, first serve.
lol there s an upcoming ariane flight ; maybe it can make a quit detour to go for it !
iRobot Radio sorry but I got dibs :)
ROSA was pushed slightly retrograde from ISS, so its orbital period (time it takes to go around Earth) is now very slightly less than ISS. So since this was an impulsive maneuver ROSA's orbit still intersects the orbit of ISS, but the phase difference means they shouldn't intersect again for years -- long enough for ROSA to de-orbit on its own due to effects of atomic oxygen still present at that altitude. Right?
Or I'm wrong and ROSA has some delta-V and can de-orbit itself, maybe?
mspencer712 Rosa has no engines (as far as I know) so it will just wait for the orbital decay
mspencer712 No, it's not moving nearly fast enough to have any meaningful change in altitude. something that light
and with that much surface area will de-orbit rather quickly.
This guy ksp's
markus ford i think you read his comment wrong, he didnt say that change in altitude would cause it to slow
stocchinet Indeed I do!
Do not go gentle into that good night.
That's OK, keep trying until we succeed. 💪
They did succeed though...
+Robert Elmer only half the deployment system worked, it wouldn't retract
But why would a satellite need to retract its solar array?
They wanted it to retract here for cleaner disposal, that's all. If it didn't, I don't think it impacts the end goal for that solar array.
I do not know the reason behind its development; but normal solar panels are not designed to retract after they are deployed because they do not need it in space.
-> This could be usefull for things that would use the upper atmosphere for aerobraking or had to pass through the "coma" of a comet or a gas giant planet´s rings.
What was the source of propulsion to move it away from the ISS? I did not see any thrust nor any push.
Wanted to see it burn up in atmosphere
It will take months or years before that happens.
1) They didn't mean to, it was meant to fold back and be placed in Dragon's trunk, which would have been jettisoned after a deorbit burn.
2) Something with such a high drag coefficient in such a low orbit (400 km) isn't going to stay there for more than a couple years.
3) Space debris are mostly a problem between 600-1000 kms up. Because of atmospheric drag, there aren't much spacecraft or debris at the ISS's altitude.
ROSA is succesful because it tested a deploy method using High Strain Composite materials to push something as heavy as that Sollar Array "blanket" in such lenght/manage to maintain shape/produce current out of it etc. Simmilar deploy is and will be even more widely used because it has very small volume in packed configuration. See simmilar tech here /watch?v=ORc6DqYUytg (very useful even for cube sats). Retract could be cool/useful but not the most important part.
Gracias nasa es hermoso y maravilloso detalle
2021. and now the other IROSA 240kw installed, 6 of em.
Imagine some rich astroid mining CEO a century later put this on a public exhibition amongst all of his private space collectables; on some orbital hotel....
why did the gold plank go bye bye?
You guys have GOT to learn about this music thing.
Ctrl+T, pick your favorite music, press play, come back to original tab
Here try this: www.youtubemultiplier.com/5951b40e63415-rosa-solar-panel-jettison.php
Dex Dude u literally spent the time to do this lmfao
You da real MVP
@ByteMe took maybe 5 minutes and I thought it was funny, so worth it.
there goes your years of work.
is there any reason to not just keep it?
and what does the PI say to this? will them attempt another test of a second ROSA before Demonstration?
and why fly to station if this could have been done by any other satellite with multiple video downlinks?
@MrVipitas You've written rubbish. It was the end of a successful test - read the video introduction where it's all explained. The panel was to be rolled up & burned during Dragon reentry anyway.
it was a technology demonstration hardware. it was mean to go up, let scientists collect data ned then it would get disposed. the data was the product not the hardware.
the hardware was worth very little, the bulk of the money gets spent on the research and figuring out how to make something. knowledge of how to make something is worth a lot. a scale copy of it is worth very little.
btw, station is a platform, you can send hardware and attach it to station. station would do all the management, control, communication and everything else. so, it's actually cheaper to send test hardware to station than to send it out on a separate craft that will need a full independent spacecraft as well as all the ground support that goes with it. station also has a large mass which was useful for vibration testing.
I don't think you an unbalance a spacecraft in microgravity in such an orbit.
it was not a demonstration - it was an experimental test.
The un-rolling was the important part no? Kinda good that it was nice and strong.
yes, un rolling it was the most important part
You should call it the Harambe Solar Array :'(
Just one more example of why a shuttle type vehicle is needed. ROSA would have been brought back down for examination, instead of being just thrown away.
It looked like ROSA took some weeds..
Ahhaha! NASA, you are always so hilariously entertaining. 🙂
kind of sad to see such a great piece of engineering and an assload of taxpayer money (my self included) actually burn up
Bombing Blody you didn't read the mission summary.
@Soren
so, by that logic, if I buy 5 liters of water and use it in a chemical experiment, get my valuable data and end up with water as side product, then I have to drink the water because disposing it is a waste of water? how dense can you be?
the panel was a small scale prototype, it wasn't designed for long term use, it was too small to be useful for ISS. and the main users of it in the future are meant to be satellites not ISS. as the mission profile suggest, it was a tech demo, the value was on the data that was collected not in the hardware
But if we already have gotten all we paid for, is that a waste?
It was a solar panel, they are inexpensive, specially the roll-out ones, which is part of the appeal of this project. If they were disposing of a functional craft or a rover... Then maybe I would be on your side.
what a waste, an african kid could have eaten that solar array!
This is bullcrap. That solar array could of fed starving children in Africa.
and those children would have grown up and have more starving children of their own.
How about these agencies stop with their lies and open up about the truth. Then spend all the money they would have used for lies to build infrastructure and education to the people in these underdeveloped nations.
What a waste
What a joke.
You can fool some of the people some of the time But not ALL of the people All of the time. :) Oh BTW Im not a Flat Earther I just KNOW film & something in this gave you away :) I'll leave it for others to see for themselves
What a load of BS. The whole Earth is covered in CLOUDS. NASA, GTFOH
incidentally, you can stop the BS and GTFOH
the white stuff are clouds
I believe this moron claim, that earth covered by clouds in this videos for the purpose of faking the space flights.