China's Space Program News Thread

[PhSt]

 

[taxiya]

So I suppose they will start taking these ultra wide scans to get a general view of the area and then focus on potential points of interest using the detailed scan?

Yes.

Do you know why they are still using a similar resolution as Hubble uses.
I mean this is a 30-year old telescope. They couldnt't try to use a bigger mirror for such a project or was the technology not there?

I don't know, but the same question can be asked about LSST

Please, Log in or Register to view URLs content!

LSST began construction of its mirror in 2007 and

Please, Log in or Register to view URLs content!

for the engineering camera expected in October 2022. Its main sensor is only slightly better than Xiuntian, essentially on the same technical level. And most importantly it is ground based meaning no construction and space constraint than Xiuntian.

Regarding the size of mirror, the constraint of space launching has not changed in the past 30 years, so the size.

 

[anzha]

I mean this is a 30-year old telescope. They couldnt't try to use a bigger mirror for such a project or was the technology not there?

Best thing to do for a space telescope is segmented. Just not in as a stupid manner as the JWST. Man, that program is cursed.

1.

Please, Log in or Register to view URLs content!

 

[gelgoog]

The problem with the JWST is it was made to be huge yet use current launchers available back then.
This meant they had to make it really complicated to cut down on weight and launch size.
Something the size of Hubble was about the limit with that launch technology.
Theoretically you could make something larger with Falcon Heavy.

 

[voyager1]

Sigh. On one hand i am excited about it but on the other I am underwhelmed. When will we be able to see clearer pictures of celestial bodies?

As a fan of space watching, it seems we have stagnated since Hubble's first photos.

So with this telescope what is more exciting is the 300x more FoV, it would be a magnificent photo!


Well, we will rest our hopes with JWST ("Webb") with its 6.5m diameter mirror!! It will be infrared but whatever, it will be better than the usual "boring" 2-2.5m telescopes we have now. I am very scared that something will happen and it wont work though. It is an extremely complex machine and it couldn't work if something small breaks down

Man, this JWST design is so complicated and easy to break...........

 

[winword]

If the same CCD sensor has 300 times of view, then yes its angular resolution would be 1/300 when used for wide FOV. But I think there are three sets of sensors responsible for different scans.

I don't know the abbreviations GS and WFS. I guess GS means "general scan" and WFS means "Wide Field Scan"? The CCD sensor gives the highest resolution, while the WFS may give the 300 times of FOV. Of course, they must have corresponding optics. It is as if the telescope has three lenses (or one lens with 3 focal lenghs).
View attachment 71865

Actually I was wrong, according to this link the FOV (1.5 degrees) is 25 times of the Hubble's FOV (0.06 degrees) (???), guess the 300 times means ~25*25 (but that would be 625)? I'm not sure how reliable it is and whether things have changed since then though. Hopefully there will be an official website soon cause these info seem a bit confusing to me.

Please, Log in or Register to view URLs content!

It also says the angular resolution is 0.15", the angular resolution of Hubble is 0.04" according to:

Please, Log in or Register to view URLs content!

 

[taxiya]

Actually I was wrong, according to this link the FOV (1.5 degrees) is 25 times of the Hubble's FOV (0.06 degrees) (???), guess the 300 times means ~25*25? I'm not sure how reliable it is and whether things have changed since then though. Hopefully there will be an official website soon cause these info seem a bit confusing to me.

Please, Log in or Register to view URLs content!

It also says the angular resolution is 0.15", the angular resolution of Hubble is 0.04" according to:

Please, Log in or Register to view URLs content!

Can you quote the part that says 25 times?

 

[winword]

Can you quote the part that says 25 times?

Just this image. I don't know where this slide come from. The FOV of Hubble is close to what I can find from Nasa's website. The angular resolution of Hubble is wrong though (unless they are not talking about visible light).

 

[longmarch]

Realistically, the majority of people who paid attention tuned away when it said it landed in the ocean.

Lots of disappointment from the space watchers who are repeating "China got lucky".
Maybe they just like disaster porn, or they want to see consequences for things they don't like.
Kinda horrid either way for these so-called intellectuals.

No it's not watching disaster porn. They were masterbating but the climax never came.

 

[j17wang]

Best thing to do for a space telescope is segmented. Just not in as a stupid manner as the JWST. Man, that program is cursed.

1.

Please, Log in or Register to view URLs content!

I'm surprised at how little American telescopes I see in this picture. The native hawaiians do seem to have some impressive assets though.