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JWST Launch NASA Livestream
- marcodiego 5y agoWhy there's no "narration"? Looks like nasa tv employees are out on holidays?
- guerrilla 5y agoThe event hadn't started when you looked. Check now.
- deleted 5y ago[deleted]
- junon 5y agoEither going to be a huge, incredible, historic event, or a massive Christmas Day tragedy. Hoping for the former - good luck NASA! E: Wow, the coverage about the hurricane causing leaks in the buildings is wild. The pictures of tarps over computer desks makes me unreasonably uncomfortable.
- nabla9 5y agoSuper exiting. * JWST costs ~$10B, about the same as Large Hadron Collider or aircraft carrier. * JWST has 344 single-point-of-failures (SPOF), 80% of them related to deployment. * No ability for repair. JWST goes to orbit the Sun 1.5 million kilometers away from the Earth, almost 4 times the distance between Earth and Moon. * Ariane 5 launch failure rate is 0.045 --- assuming 0.045 launch failure probability, and 0.0001 failure probability for each SPOF, the mission failure probability is ~8%. 0.955×(1−0.0001)^344
- guerrilla 5y ago> 0.0001 failure probability for each SPOF Why did you choose this value for the assumption? Is that standard or a publicized detail?
- nabla9 5y agoI picked relatively high number 1/10000 as a starting point to get a ballpark. NASA has never tested deployment in the zero gravity. It's unlikely that the probability is higher. Ariane launch failure probability dominates if you add zeros. 0.00001 -> 4.8% 0.000001 -> 4.5%
- wiz21c 5y agoThis makes a 92% success rate... I'm not sure I would cross a road if I had that much chance to be hit by a car :-)
- efitz 5y agoI’m much more concerned about what will happen once the telescope is in operation. We can’t send astronauts to L2 to fix it like we could send them to Hubble on STS.
- pfdietz 5y agoWe can't yet, but doing so isn't entirely out of the question. It's easier than sending anyone to Mars. The one-way trip time for astronauts to L2 might be 25 days. https://www.wired.com/2012/04/100-day-mission-to-sun-earth-l2-1999/ https://www.wired.com/2012/04/100-day-mission-to-sun-earth-l...
- api 5y agoJWST apparently does have some kind of docking attachment so we can service it if we get the capability between now and EOL. Servicing once could likely double its useful life. Starship and Orion could do it AFAIK. Maybe Dragon with a service module.
- instagraham 5y agoI wonder what the Eye of God will look like through this telescope. It's much farther out than Hubble.
- chinathrow 5y agoI had to look this one up - https://en.wikipedia.org/wiki/Helix_Nebula https://en.wikipedia.org/wiki/Helix_Nebula
- perihelions 5y ago32 minute launch window starting at 12:20 UTC (07:20 EST). When this comment's indicated age is ~30 minutes. https://blogs.nasa.gov/webb/2021/12/21/james-webb-space-telescope-launch-update/ https://blogs.nasa.gov/webb/2021/12/21/james-webb-space-tele...
- Jellyspice 5y agoCountdown page https://jwst.nasa.gov/content/webbLaunch/countdown.html https://jwst.nasa.gov/content/webbLaunch/countdown.html
- ryzvonusef 5y agolaunch looks good!
- ryzvonusef 5y agohttps://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html
- dredmorbius 5y agoGood launch. And over 472k viewers on the livestream. Good service by YouTube. (I don't get to praise them often, credit where due.) All launch events seemed precisely on schedule and trajectory. The 2nd stage even caught the solar panel deploy on camera, which I believe was an unexpected bonus. Now we've got 30 days of deployment events, another 300 or so SPOFs to clear. Arrival at L2 in a month. Six months to chill and calibrate (with or without Netflix I'm not sure). Science starts in June.
- jacquesm 5y ago> 472k viewers on the livestream We had about 11K on STS 82, which I still think was the high point of my career. Back in the day with capacity being what it was that put a serious strain on the internet as a whole, shortly after that we had to move to the other side of the Atlantic be able to continue to operate.
- kurthr 5y agoI was a little disappointed, because I'd watched the animation last night. The only differences were in the first 4 seconds (before it hit the clouds) and after the spring launch, when we caught the solar panel deploy in the sun with earth below from the 2nd stage. At least everything went as planned! I was surprised at the timeline and how rapidly it slows before reaching the L2 orbit. It's already fallen from 4mps to 1.7mps in the first few hours. Even though it takes 30 days to reach L2, it will be 30% of the way there in the first day. https://webb.nasa.gov/content/webbLaunch/whereIsWebb.html https://webb.nasa.gov/content/webbLaunch/whereIsWebb.html
- Symbiote 5y agoAdditional comments on the ESA livestream (posted a few minutes before this one): https://news.ycombinator.com/item?id=29681636 https://news.ycombinator.com/item?id=29681636
- ravisutrave 5y ago"Webb will soon begin an approximately two-week process to deploy its antennas, mirrors, and sunshield." https://twitter.com/NASA/status/1474724928360525827 https://twitter.com/NASA/status/1474724928360525827
- magicalhippo 5y agoAnyone know why the trajectory dipped down during the second stage? To gain extra orbital velocity or something? Been too long since I played Kerbal Space Program.
- kingofpandora 5y agoFrom the broadcast: "Liftoff from a tropical rain forest at the edge of time itself." What does that mean?
- sjburt 5y agoIt was “to the edge of time itself” which I guess is some kind of reference to the telescope being able to observe the early universe? It seemed kind of cheesy.
- jacquesm 5y agoIt is 'to the edge of time' and what they mean with it is that the JWST can look very far back into our past to the earliest days of the universe with its instruments that are capable of observing severely red-shifted wavelengths.
- 95014_refugee 5y agoIt means that someone was paid to talk, because radio dies hard. The idea that commentary should be informative and that content can speak for itself is (still) deeply threatening to many folks in the broadcast industry. See any sports broadcast for examples.