AstroBin

AstroBin

AstroBin

Red-shift compensation? [Deep Sky] Processing techniques · Crimsus · ... · 7 · 359 · 0

Crimsus 0.00
Crimsus
...
· 
·  1 like
·  Share link
I had a crazy thought the other day.

Has anyone ever played around with correcting the RGB channels of an image to compensate for red-shift?

Sometimes I get bored and come up with weird ideas. smile

-Crimsus
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
TiffsAndAstro 1.81
TiffsAndAstro
...
· 
·  1 like
·  Share link
I had a crazy thought the other day.

Has anyone ever played around with correcting the RGB channels of an image to compensate for red-shift?

Sometimes I get bored and come up with weird ideas.

-Crimsus


are amateurs even capable of taking images of stuff so distant that red shift is an issue? 
 using NB Ha filter, the shift would move it outside of the filters bandpass so it would be blocked anyhow?

Still an interesting question though.
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
TimH
Tim Hawkes
...
· 
·  1 like
·  Share link
TiffsAndAstro:
I had a crazy thought the other day.

Has anyone ever played around with correcting the RGB channels of an image to compensate for red-shift?

Sometimes I get bored and come up with weird ideas.

-Crimsus


are amateurs even capable of taking images of stuff so distant that red shift is an issue? 
 using NB Ha filter, the shift would move it outside of the filters bandpass so it would be blocked anyhow?

Still an interesting question though.

Actually - if you use an SII filter then you can pick up HA in the coma cluster - shift ca 16 nm - so it is possible with thought but would have to be tailored for different objects at different recessional  distances?
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
Crimsus 0.00
Crimsus
Topic starter
...
· 
·  2 likes
·  Share link
Tim Hawkes:
are amateurs even capable of taking images of stuff so distant that red shift is an issue?
using NB Ha filter, the shift would move it outside of the filters bandpass so it would be blocked anyhow?

Still an interesting question though.

Actually I worked in Space Command for 10 years working on hyper-spectral satellite systems. I didn't mean my question to sound like an amateur. I was just keeping it casual.

I'm talking about something like an image taken by an RGB camera, but in post, adjusting the colors to represent their true wavelength based on the red-shift. I left filters out since the filters can't account for red-shift, plus the bandpass for each channel would have to be pretty generous so the light we want doesn't get filtered out. The filters would be more of a hindrance than helpful. Capturing the light without a filter would give any adjustments to the channels ample room so nothing gets lost.

The challenge is finding a target that can be captured that is far enough away, but not too far. The rest is simple math to calculate the red-shift and adjusting the channels accordingly.

-Crimsus
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
TiffsAndAstro 1.81
TiffsAndAstro
...
· 
·  Share link
Tim Hawkes:
are amateurs even capable of taking images of stuff so distant that red shift is an issue?
using NB Ha filter, the shift would move it outside of the filters bandpass so it would be blocked anyhow?

Still an interesting question though.

Actually I worked in Space Command for 10 years working on hyper-spectral satellite systems. I didn't mean my question to sound like an amateur. I was just keeping it casual.

I'm talking about something like an image taken by an RGB camera, but in post, adjusting the colors to represent their true wavelength based on the red-shift. I left filters out since the filters can't account for red-shift, plus the bandpass for each channel would have to be pretty generous so the light we want doesn't get filtered out. The filters would be more of a hindrance than helpful. Capturing the light without a filter would give any adjustments to the channels ample room so nothing gets lost.

The challenge is finding a target that can be captured that is far enough away, but not too far. The rest is simple math to calculate the red-shift and adjusting the channels accordingly.

-Crimsus


I would love a CV with something called space command on it
​​​​​​
been a while but 1 billion light years is about 0.08?
But, maybe redshifted gamma rays from black hole emissions? Would need to be very distant to shift them down to visible light ranged and probably far too weak.
I'll leave this to pros like yourself on here, but this is still a very interesting idea.
Edited ...
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
MaksPower 1.20
MaksPower
...
· 
·  1 like
·  Share link
TiffsAndAstro:
are amateurs even capable of taking images of stuff so distant that red shift is an issue? 
 using NB Ha filter, the shift would move it outside of the filters bandpass so it would be blocked anyhow?

Still an interesting question though.

Roland Christen imaged the Einstein cross with his 10" maksutov, so yes it is possible. Many distant galaxies, quasars and Einstein rings within grasp of amateur scopes, many images of them right here on AstroBin.

It's on my to-do list, but I need more practice before I attempt one of these with mine. I never cease to be amazed at what's possible with the current gear, compared to when I started 50 years ago.
Edited ...
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
MaksPower 1.20
MaksPower
...
· 
·  Share link
The answer is yes there are objects with big redshifts within the grasp of amateur scopes.

One example is a quasar recently discovered at 13B light years which looks like a boring dim orange star - at magnitude 16 - until someone measured its  spectrum and realised its not a star at all. https://www.ndtv.com/science/brightest-known-object-in-the-universe-was-hiding-in-plain-sight-for-decades-study-5135352/amp/1

The challenge however is whether amateur scopes are capable of doing spectroscopy on such targets with sufficient spectral resolution to measure the redshift.  That’s a whole different challenge and I suspect the answer is no.
Edited ...
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
Gondola 8.11
Tony Gondola
...
· 
·  Share link
For objects that are close enough to show significant detail in typical amateur apertures, I suspect that it really wouldn't matter much.
Like
×

Sorry :-(

Editing a post is only allowed within 24 hours after creating it.
×

Share this forum post

Copy the URL below to share a direct link to this post.

Close
×

Post editing not available

This post cannot be edited using the classic forums editor.

To edit this post, please enable the "New forums experience" in your settings.

Go to Settings Close
 
Register or login to create to post a reply.
×

Warning!

This operation will reload the current page. If you have any unsaved information in a form, it will be lost.

You can also dismiss this window, and your operation will be applied at the next page navigation.