JWST Launch NASA Livestream

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.

Re: JWST Launch NASA Livestream

#6

Post by 1_player » Sat, Dec 25, 2021, 11:19 AM UTC

junon wrote: post #5

Either 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.

My hope is that if it's the latter, building a new JWST from scratch will not take as much time and money as designing the first prototype did. I hope they have kept really good notes and backups :-)

Re: JWST Launch NASA Livestream

#7

Post by nabla9 » Sat, Dec 25, 2021, 11:24 AM UTC

Super 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

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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

Re: JWST Launch NASA Livestream

#8

Post by guerrilla » Sat, Dec 25, 2021, 11:36 AM UTC

nabla9 wrote: post #7

Super 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.…

> 0.0001 failure probability for each SPOF

Why did you choose this value for the assumption? Is that standard or a publicized detail?

Re: JWST Launch NASA Livestream

#9

Post by instagraham » Sat, Dec 25, 2021, 11:40 AM UTC

I wonder what the Eye of God will look like through this telescope. It's much farther out than Hubble.

Re: JWST Launch NASA Livestream

#10

Post by perihelions » Sat, Dec 25, 2021, 11:50 AM UTC

32 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-tele...