R26 oldtimer Posted December 15, 2021 Share Posted December 15, 2021 Bet you've seen that before... 1 1 Link to comment Share on other sites More sharing options...
Xgaze Posted December 15, 2021 Share Posted December 15, 2021 Launch on the 24th?? Need to check the santa tracker to avoid collision !! https://www.noradsanta.org/en/ 1 Link to comment Share on other sites More sharing options...
ONIKKINEN Posted December 15, 2021 Share Posted December 15, 2021 Remember that even if the spacecraft itself works perfectly, the launch vehicle can still malfunction. There is no such thing as a perfectly reliable rocket so it could turn into a 10 billion dollar fireworks show. Link to comment Share on other sites More sharing options...
kirkster501 Posted December 15, 2021 Author Share Posted December 15, 2021 Yes, the ten billion dollar fireworks. A bad day indeed that would be. Link to comment Share on other sites More sharing options...
Tomatobro Posted December 15, 2021 Share Posted December 15, 2021 The best engineers have to know the unknowable and foresee the unforeseeable and I am sure that a lot of folks have done all that they can to ensure success. Space engineering is now a well understood subject but there is still the human factor that can affect the outcome. Its hard to imagine what it must be like for the men and women who have put there whole careers into this project knowing that success or failure is now just round the corner. 1 Link to comment Share on other sites More sharing options...
Rapallokid Posted December 15, 2021 Share Posted December 15, 2021 Thanks for the tip about registering. All sorted. Link to comment Share on other sites More sharing options...
Tomatobro Posted December 16, 2021 Share Posted December 16, 2021 I just read about a problem called vacuum welding between moving parts in satellites and why designers of such craft hate moving parts and try to avoid them if at all possible. That's it. No more reading for me till its deployed and working. 1 Link to comment Share on other sites More sharing options...
jock1958 Posted December 16, 2021 Share Posted December 16, 2021 6 minutes ago, Tomatobro said: I just read about a problem called vacuum welding between moving parts in satellites and why designers of such craft hate moving parts and try to avoid them if at all possible. That's it. No more reading for me till its deployed and working. Couldn’t help myself after reading this thread and googled about some of the technical aspects and indeed there are lots of moving parts that need to work. I remember the news headlines after they launched the Hubble “Trouble with the Hubble” 😩 Link to comment Share on other sites More sharing options...
Swoop1 Posted December 16, 2021 Share Posted December 16, 2021 On 14/12/2021 at 19:12, tomato said: They’ve deployed and folded it up that many times on the ground, a lot of components must be someways into their working life… Still I’ll be willing it on next week and through the 30 days of terror.🤞🙏🙄 The thing is, most of the moving parts only need to work once more don't they? Once deployed, that is it. I am trying to imagine designing and engineering moving parts to operate in micro gravity. Here on planet Earth, gravity can be a big assist- want that big thing to drop into place- release the latch and let it go. Up there at L2, simple things like restraining cords and guys that help with the sunshade could float on loop and cause all sorts of trouble. Link to comment Share on other sites More sharing options...
Maideneer Posted December 16, 2021 Share Posted December 16, 2021 I read somewhere that there is no chance to ever do repairs to the unit once launched. Can someone smarter than me please explain why that is? 1 Link to comment Share on other sites More sharing options...
johninderby Posted December 16, 2021 Share Posted December 16, 2021 (edited) Simply too far away as it will be at the L2 point unlike Hubble that’s in a low orbit near the earth. https://www.nasa.gov/topics/universe/features/webb-l2.html Edited December 16, 2021 by johninderby Link to comment Share on other sites More sharing options...
Maideneer Posted December 16, 2021 Share Posted December 16, 2021 4 minutes ago, johninderby said: Simply too far away as it will be at the L2 point. https://www.nasa.gov/topics/universe/features/webb-l2.html Thanks for that link! On a side note, the article is dated from June 2010 and the last sentence reads "...and the Webb telescope will be heading out to L2 in the near future." lol I guess in astronomical terms, 11 years is a speck of sand. Link to comment Share on other sites More sharing options...
ONIKKINEN Posted December 17, 2021 Share Posted December 17, 2021 9 hours ago, Maideneer said: I read somewhere that there is no chance to ever do repairs to the unit once launched. Can someone smarter than me please explain why that is? 9 hours ago, johninderby said: Simply too far away as it will be at the L2 point unlike Hubble that’s in a low orbit near the earth. https://www.nasa.gov/topics/universe/features/webb-l2.html It is a bit far away, but i wouldn't call it impossible to send a crew there. From an engineering point of view the spacecraft going there and back in a timely manner needs a fair bit of delta V but not a crazy amount. Somewhere around the range of going to Lunar orbit and back perhaps, and a lot less if the most efficient route is taken (one that JWST takes, which takes weeks). Definitely not an amount that current rockets wouldn't be capable of. Being so far from Earth will mean that the magnetosphere is no longer there to prevent the crew from possible coronal mass ejections which would probably kill the crew, but this issue must be solved one day if a Mars mission were to be even considered. I could definitely see a JWST maintenance mission being a convenient excuse to practice further than LEO operations for crews. But of course NASA is not going to be interested in the idea if the mission fails so for now its "no chance". Link to comment Share on other sites More sharing options...
johninderby Posted December 17, 2021 Share Posted December 17, 2021 A repair mission would be possible if NASA got the billions in funding that would be needed but might be cheaper to build a new more advanced telescope. Link to comment Share on other sites More sharing options...
ONIKKINEN Posted December 17, 2021 Share Posted December 17, 2021 It would definitely not cost billions to send a repair crew since little new tech would be required. Maybe a modified SpaceX dragon with a radiation shielded habitation module in tow would be enough. Although that's not the NASA way, the true NASA way is to spend as much money as possible and develop everything from scratch, even if alternatives exist so it could very well be billions in that case. Link to comment Share on other sites More sharing options...
ScouseSpaceCadet Posted December 17, 2021 Share Posted December 17, 2021 12 hours ago, ONIKKINEN said: It would definitely not cost billions to send a repair crew since little new tech would be required. Maybe a modified SpaceX dragon with a radiation shielded habitation module in tow would be enough. Although that's not the NASA way, the true NASA way is to spend as much money as possible and develop everything from scratch, even if alternatives exist so it could very well be billions in that case. Wait two years or so and Mr Musk's Starship would likely be up to the job. Hopefully that's not required. I would not want to be one of those JWST engineers waiting for everything to work perfectly! Link to comment Share on other sites More sharing options...
Swoop1 Posted December 17, 2021 Share Posted December 17, 2021 12 minutes ago, ScouseSpaceCadet said: Wait two years or so and Mr Musk's Starship would likely be up to the job. Hopefully that's not required. I would not want to be one of those JWST engineers waiting for everything to work perfectly! I stand at home with a twitching sphincter every time I flick the switch after doing minor electrical repairs praying that I have been successful. I dread to think how the team will feel watching the launch then waiting for the telescope to send the signals that say "Yay, and verily thrice Yay! All widgets, woggles, lousepoodles and flanges have successfully deployed are working A OK." 1 2 Link to comment Share on other sites More sharing options...
kirkster501 Posted December 18, 2021 Author Share Posted December 18, 2021 On 17/12/2021 at 14:36, Swoop1 said: I stand at home with a twitching sphincter every time I flick the switch after doing minor electrical repairs praying that I have been successful. I dread to think how the team will feel watching the launch then waiting for the telescope to send the signals that say "Yay, and verily thrice Yay! All widgets, woggles, lousepoodles and flanges have successfully deployed are working A OK." We all feel like that after electrical work mate 🤣 2 Link to comment Share on other sites More sharing options...
Chefgage Posted December 18, 2021 Share Posted December 18, 2021 (edited) 4 hours ago, kirkster501 said: We all feel like that after electrical work mate 🤣 Definitely. Only the other day I had my fingers crossed whilst re-booting a scada panel after a repair. Edited December 18, 2021 by Chefgage Link to comment Share on other sites More sharing options...
Pixies Posted December 20, 2021 Share Posted December 20, 2021 On 18/12/2021 at 19:26, Chefgage said: Definitely. Only the other day I had my fingers crossed whilst re-booting a scada panel after a repair. Every time I try and start the campervan! 2 Link to comment Share on other sites More sharing options...
kirkster501 Posted December 21, 2021 Author Share Posted December 21, 2021 (edited) Three days and it's still a go for launch at midday on Friday 😱 The Launch - Webb/NASA Edited December 21, 2021 by kirkster501 Link to comment Share on other sites More sharing options...
Jonk Posted December 21, 2021 Share Posted December 21, 2021 Exciting! 1 Link to comment Share on other sites More sharing options...
JeremyS Posted December 21, 2021 Share Posted December 21, 2021 Interesting item here on following JWST after launch, imaging it thru Orion: https://britastro.org/node/26452 1 Link to comment Share on other sites More sharing options...
kirkster501 Posted December 21, 2021 Author Share Posted December 21, 2021 (edited) Yes, we should be able to image it, weather permitting. If anyone does, please share images here guys! Edited December 21, 2021 by kirkster501 1 Link to comment Share on other sites More sharing options...
kirkster501 Posted December 21, 2021 Author Share Posted December 21, 2021 37 minutes ago, Jonk said: Exciting! Isn't it just! I hope NASA will pull the plug on the launch if there is any doubt and that they do not feel compelled to launch it for "not-another-delay" embarrassment avoidance motives. After all this time, a few more weeks is not a big deal. Link to comment Share on other sites More sharing options...
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