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Nancy Grace Roman Space Telescope

science.nasa.gov

61–70 of 115 posts

Re: Nancy Grace Roman Space Telescope

#61

Earlier quoted context omitted.

I suppose we should be grateful he didn’t force his own name at the last minute. I suppose he still has time.

[flagged]

Tell me you don’t know anything about the ACA’s history without telling me you don’t know anything about the ACA’s history.

Re: Nancy Grace Roman Space Telescope

#62
post #51

Earlier quoted context omitted.

Even if it is a publicity stunt it was not lobbied by Elon Musk. Also Jeff Bezos Blue Origin got more money for the Artemis program.

I see. And how do you you know that elon, a notably close supporter of the president didn't have anything to do with the Artemis program? I notice that Chinese electric vehicles are essentially banned in the US, but probably that had nothing to do with Elon as well right? And what does it matter if Blue Origin also made money on the Artemis program?

No need to be so combative.

Re: Nancy Grace Roman Space Telescope

#63

Earlier quoted context omitted.

> * https://nextspaceflight.com/launches/details/6983/ 06:25 AM Window Open 06:26 AM Window Close Is it really just a 1 minute launch window? That seems incredibly tight. If there's any hitch in the countdown, that would pretty much mean a scrubbed launch. Not being well versed in orbital mechanics, why would the window be so short?

There's some discussion about a similar launch ~10 years ago (in that case going to L1) https://www.reddit.com/r/spacex/comments/2vb5kv/1second_laun...

Based on that, I guess the one upside would be that you have the window available every day as the L1/L2 positions never move relatively. Unlike a launch to Mars or other solar system body where you definitely want everything to be lined up efficiently.

Re: Nancy Grace Roman Space Telescope

#64

Part of the story is everyone being shocked at being under budget and ahead of schedule. I don't know everything, but I think this is reasonably attributable to the fact that this is a retrofit of an obsolete spy satellite. The leftovers of the security sector will be the most advanced scientific space surveyor. I have to wonder what things would look like with different priorities.

Isn't that also how Hubble started? I'd assume there's a lot of lessons learned to avoid costly research on conversion of the platform.

Hubble was the result of an open competition between a variety of companies and technologies. But the winners were the people who built the KH-11 spy satellite, who could offer the cheapest and best proved options because of their experience with KEENAN.

Both KH-11 and Hubble had similar sized mirrors, but that wasn't because of design reuse, it was because that was the biggest primary mirror you could fit in the Space Shuttle cargo bay (1). In actual fact no KH-11 went into space on a Shuttle, but the plan up until the Challenger disaster had been for the STS to carry all US satellites into space, including the KH-11, which was designed around that cargo bay.

1: The space shuttle cargo bay was sized the way it was for NRO payloads, but it seems clear that the USAF wasn't thinking about KEEENAN when they requested that size- a design like that would be better if it was wider and didn't need to be nearly as long. My suspicion is, when NASA asked them what size they wanted for the bay, they took the last design they had- the just cancelled KH-10 Manned Orbiting Laboratory, and used that.

Re: Nancy Grace Roman Space Telescope

#65
post #3

I'm still holding my breath on this one, will be most amazing telescope in my lifetime parked in L2 a million miles away with 500mbps data transfer rate (1.5TB per DAY) we've made it past DOGE destroying it we've made it past him renaming it after himself and putting his mugshot on it but Musk still needs to send it out of orbit without explosions, so here's hoping (Falcon Heavy, don't tell me the odds) * https://nex…

> * https://nextspaceflight.com/launches/details/6983/ 06:25 AM Window Open 06:26 AM Window Close Is it really just a 1 minute launch window? That seems incredibly tight. If there's any hitch in the countdown, that would pretty much mean a scrubbed launch. Not being well versed in orbital mechanics, why would the window be so short?

It is important to point out, since you did not note the timezone with that quote, that the launch is actually scheduled for NET 07:26am EDT or 11:26:00 UTC.

You can get live countdowns and updates at https://www.spacex.com/launches which will link to first-party livestream coverage during the launch.

No need to go through third-party and advertising-laden dot-com sites.

The Falcon 9 and Falcon Heavy are intolerant to countdown holds late in the sequence. In particular, after propellant has been loaded, there must be no delay in launch. Any countdown holds will necessarily turn into a scrub for the day, as the propellant must be completely unloaded and the process restarted to prepare for launch. With the instantaneous window, it'll either be "go/no-go" at 07:26am EDT, or they'll go-around to another opportunity on Monday morning, around 07:22am.

Re: Nancy Grace Roman Space Telescope

#66

Earlier quoted context omitted.

> * https://nextspaceflight.com/launches/details/6983/ 06:25 AM Window Open 06:26 AM Window Close Is it really just a 1 minute launch window? That seems incredibly tight. If there's any hitch in the countdown, that would pretty much mean a scrubbed launch. Not being well versed in orbital mechanics, why would the window be so short?

It is important to point out, since you did not note the timezone with that quote, that the launch is actually scheduled for NET 07:26am EDT or 11:26:00 UTC. You can get live countdowns and updates at https://www.spacex.com/launches which will link to first-party livestream coverage during the launch. No need to go through third-party and advertising-laden dot-com sites. The Falcon 9 and Falcon Heavy are intolerant t…

The timezone has no bearing on the the one minute wide window. This was not posted as an advertisement of launch time. I provided the link the info was taken. If you click on it, it shows you the localized time. Not really sure why you feel like this was the important part of the question.

Re: Nancy Grace Roman Space Telescope

#67
I will never understand why NASA doesn't build at least two copies of expensive space telescopes like this. One single launch failure and boom (literally), the entire project is a failure?

It wouldn't double the cost assuming they do it with even a modicum of efficiency and intelligence. And hey - assuming that the launch goes smoothly, you can get double the benefit

Re: Nancy Grace Roman Space Telescope

#68

I will never understand why NASA doesn't build at least two copies of expensive space telescopes like this. One single launch failure and boom (literally), the entire project is a failure? It wouldn't double the cost assuming they do it with even a modicum of efficiency and intelligence. And hey - assuming that the launch goes smoothly, you can get double the benefit

why build one when you can build two for twice the price?

Re: Nancy Grace Roman Space Telescope

#70

Part of the story is everyone being shocked at being under budget and ahead of schedule. I don't know everything, but I think this is reasonably attributable to the fact that this is a retrofit of an obsolete spy satellite. The leftovers of the security sector will be the most advanced scientific space surveyor. I have to wonder what things would look like with different priorities.

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