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James Webb Telescope

Started by Hydra009, December 19, 2021, 09:26:21 PM

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PopeyesPappy

Quote from: Hydra009 on December 29, 2021, 12:39:42 AM
Sunshield deployed!

Not quite. The booms are out, but it hasn't been tensioned yet. The tensioning is one of the most complicated parts of the deployment. They are currently looking at the temperatures of some of the motors involved along with the power systems.

https://www.space.com/james-webb-space-telescope-sunshield-tension-delay
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Gawdzilla Sama

I was watching a docu on the Perseverance rover last night. I'm surprised there aren't more burnouts.
We 'new atheists' have a reputation for being militant, but make no mistake  we didn't start this war. If you want to place blame put it on the the religious zealots who have been poisoning the minds of the  young for a long long time."
PZ Myers

Hydra009

Quote from: PopeyesPappy on January 02, 2022, 08:34:38 PM
Not quite. The booms are out, but it hasn't been tensioned yet. The tensioning is one of the most complicated parts of the deployment. They are currently looking at the temperatures of some of the motors involved along with the power systems.

https://www.space.com/james-webb-space-telescope-sunshield-tension-delay
Well, it is now.  https://www.yahoo.com/news/james-webb-space-telescope-sun-170243955.html

PopeyesPappy

Quote from: Hydra009 on January 04, 2022, 11:20:22 PM
Well, it is now.  https://www.yahoo.com/news/james-webb-space-telescope-sun-170243955.html

Seems to be working too. The average temperature difference between the hot and cold side is 368 F (205 C).

Deployment of the secondary mirror has started.
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SGOS

With that much heat radiation, they could have powered it with a steam engine.

Gawdzilla Sama

Somebody let me know if it spots intelligent life anywhere in the universe.
We 'new atheists' have a reputation for being militant, but make no mistake  we didn't start this war. If you want to place blame put it on the the religious zealots who have been poisoning the minds of the  young for a long long time."
PZ Myers

Hydra009

Quote from: Gawdzilla Sama on January 05, 2022, 07:11:14 PMSomebody let me know if it spots intelligent life anywhere in the universe.
I don't know if it could do that even if pointed at Earth.

Gawdzilla Sama

Quote from: Hydra009 on January 05, 2022, 07:16:28 PM
I don't know if it could do that even if pointed at Earth.
Note the wording I used.
We 'new atheists' have a reputation for being militant, but make no mistake  we didn't start this war. If you want to place blame put it on the the religious zealots who have been poisoning the minds of the  young for a long long time."
PZ Myers

PopeyesPappy

Quote from: SGOS on January 05, 2022, 11:43:35 AM
With that much heat radiation, they could have powered it with a steam engine.

Not usually hot enough to generate steam, but a Sterling engine might work.
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Hydra009


Hydra009

I know recent events have sorta put this on the back burner, but I just want you guys to know that the telescope has completed its journey to L2!  1.46 milllion km!  Now, it's just the relatively simple matter of aligning/calibrating the mirrors (for a scant 5 months) before the images start pouring in!

PopeyesPappy

Quote from: Hydra009 on January 26, 2022, 09:35:46 AM
I know recent events have sorta put this on the back burner, but I just want you guys to know that the telescope has completed its journey to L2!  1.46 milllion km!  Now, it's just the relatively simple matter of aligning/calibrating the mirrors (for a scant 5 months) before the images start pouring in!

I don't know about pouring in. Many of the images are going to be multiple long exposures.

For example the Hubble Ultra Deep Field:
QuoteThe image required 800 exposures taken over the course of 400 Hubble orbits around Earth. The total amount of exposure time was 11.3 days, taken between Sept. 24, 2003 and Jan. 16, 2004.

That's just exposure time. Image processing time is not included.

The good news is most of the images probably won't take that long so maybe we will see some of the early targets fairly quickly after the alignment is complete. Maybe...
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Blackleaf

I've been seeing this picture floating around. Is this an actual photograph of Pluto from James Webb?

[spoiler=Spoilered due to large size][/spoiler]
"Oh, wearisome condition of humanity,
Born under one law, to another bound;
Vainly begot, and yet forbidden vanity,
Created sick, commanded to be sound."
--Fulke Greville--

Hydra009

Quote from: Blackleaf on January 26, 2022, 07:37:34 PM
I've been seeing this picture floating around. Is this an actual photograph of Pluto from James Webb?
https://www.youtube.com/watch?v=GM-e46xdcUo

Circa 2016.  Almost certainly a false color image created from this image taken from the New Horizons Pluto flyby in 2015.  https://solarsystem.nasa.gov/resources/933/true-colors-of-pluto/

Blackleaf

Ah. I was thinking it was a lot more colorful than I was expecting. Oh well.
"Oh, wearisome condition of humanity,
Born under one law, to another bound;
Vainly begot, and yet forbidden vanity,
Created sick, commanded to be sound."
--Fulke Greville--