Jump to content

James Webb vs Spitzer


Recommended Posts

Recently I saw comparison between an image taken by Spitzer and an image taken by James Webb space telescope (here, for example: https://www.planetary.org/space-images/spitzer-vs-jwst-in-infrared ).

Why there are those rays of light visible around bright starts on the James Webb image (but not on the Spitzer image)? BTW, Is there a specific English term for this effect?

Also, does anybody know what could be the exposition time needed to make these pictures (both, Spitzer and James Webb)?

Link to comment
Share on other sites

I see.

So it seems the effect is especially pronounced for 'overexposed' stars. So I guess they can have certain control by using proper exposition time.

But, since we know how the effect is caused, shouldn't we be able to simply remove the effect from the image numerically? If this can be done, I guess they didn't do it just because the image looks more interesting to general population with all those rays sparkling around.

Link to comment
Share on other sites

48 minutes ago, Danijel Gorupec said:

I see.

So it seems the effect is especially pronounced for 'overexposed' stars. So I guess they can have certain control by using proper exposition time.

But, since we know how the effect is caused, shouldn't we be able to simply remove the effect from the image numerically? If this can be done, I guess they didn't do it just because the image looks more interesting to general population with all those rays sparkling around.

Do they need to remove the effect?

Link to comment
Share on other sites

I imagine the removal of the effects would depend on the goal of the picture. It would be a corruption of data if you were investigating an area of sky near the star, but I imagine you can put an aperture in place if you were looking at the star itself. As noted, those particular stars are overexposed, so you've already screwed up if you were trying to determine their luminosity.

If it's just for PR, it's a neat effect that some people probably like.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.