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The James Webb Space Telescope and stuff


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On 12/6/2021 at 6:31 AM, NFUN said:

Each day that passes without it getting pushed back is further confirmation of the date

I won't believe all is good until telescope unfurls and sends first good quality pictures.

I still remember massive, gut-wrenching disappointment of seeing first photos Hubble sent.

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So, Insert_Name prophetically warned about the clamps way back in May.*

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The recent break between ariane 5 launches has been revealed to be related to an issue with vibrations from the faring separation mechanism, JWST may be delayed due to the backlog that occurs from this.

Of course, the clamp issue did raise its ugly head and threaten Webb.

 

 

 

 

But where was the warning about cabling?

 

 

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Edited by Minmus Taster
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3 hours ago, Minmus Taster said:

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Yes, but I had scheduled my vacation to possibly include the launch on the 22nd.   Now I’ll have to watch it online like a peasant.  

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5 hours ago, SunlitZelkova said:

Aren't all of these delays a good thing? Better to have a problem fixed on the ground then have a disaster in flight.

I think it's not so much the delay, as disappointment over the fact that there are so many problems to be fixed after this many delays and inspections.

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The standard science-communicator line is that JWST will stop operating after its stationkeeping fuel runs out. Since it's not going to be in Earth's shadow anyway, what would actually break? Couldn't they try to keep the comms dishes pointed at each other by carefully monitoring the drift away from L2? Is it a question of attitude control?

Unrelated thought, the sunshield is designed to minimize the infrared light that makes it to the detector side. Does that make it it a backwards stealth shield?

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21 minutes ago, HebaruSan said:

Does that make it it a backwards stealth shield?

It makes it a sombrero.

Hydrazine is used for station keeping, while attitude is controlled by reaction wheels. However, reaction wheels saturate and need some sort of rocket engine to desaturate. without hydrazine, reaction wheels will not be capable of maintaining attitude.

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3 hours ago, Shpaget said:

It makes it a sombrero.

Hydrazine is used for station keeping, while attitude is controlled by reaction wheels. However, reaction wheels saturate and need some sort of rocket engine to desaturate. without hydrazine, reaction wheels will not be capable of maintaining attitude.

Now I assume they could simply rotate the opposite way observing new targets and keep  the target list so they never saturate? 
On the other hand they have to keep the sun shield against the sun so its not like most space telescopes. 
 

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On 3/27/2018 at 6:23 PM, Hesp said:

Shouldn't GEO be enough for that?

Anyway, a dollar bill is 0.11mm thick. 9B$ = 990km

You are forgetting the trick about how many times you can fold a piece of paper to make it thicker. If you fold it enough times and either use origami to hold it sufficiently or glue it money truly could be the solution to all problems! 8)

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On 12/18/2021 at 3:16 PM, Shpaget said:

It makes it a sombrero.

Hydrazine is used for station keeping, while attitude is controlled by reaction wheels. However, reaction wheels saturate and need some sort of rocket engine to desaturate. without hydrazine, reaction wheels will not be capable of maintaining attitude.

If they had designed it today... they would have included an option for robotic refueling.    That’s well within the capabilities of modern commercial launches.     And given the cost of the telescope and the reasonably low cost of this sort of mission, it makes fiscal sense to have included it.       But this wasn’t even a possibility when it was first deigned. 

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3 hours ago, Gargamel said:

If they had designed it today... they would have included an option for robotic refueling.    That’s well within the capabilities of modern commercial launches.     And given the cost of the telescope and the reasonably low cost of this sort of mission, it makes fiscal sense to have included it.       But this wasn’t even a possibility when it was first deigned. 

Curious...if they were designing JWST today, what approach would they use for robotic refueling? Something like Progress?

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5 hours ago, Gargamel said:

If they had designed it today... they would have included an option for robotic refueling.    That’s well within the capabilities of modern commercial launches.     And given the cost of the telescope and the reasonably low cost of this sort of mission, it makes fiscal sense to have included it.       But this wasn’t even a possibility when it was first deigned. 

As @sevenperforce said, Progress has been doing this for decades, so it was clearly a possibility.

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