My crab gif. 20 years of expansion

[adamphillips]

I spent a lot of time trying to get the colors to match the original hubble image. it turned out better than I thought it would. the hubble image is from 2000, and the new one is from 2019. almost 20 years of expansion. remember this is expanding at about 1500 meters per second. 

 

[Brian Maurer]

Very cool!

[Craney]

Nice one.   Is the Crab particularly 'fast', compact, recent or close for us to see this in as little as 20 years...??   

I wonder if other SNR  show the same type of effect.   Fascinating.

[carastro]

Extremely well done.

Carole 

[Skipper Billy]

Fascinating - it looks like its 'breathing'!

 

[Mr Spock]

Quite a bit of movement for just 20 years. I wonder how it compares to much older images.

[vlaiv]

Very nice indeed.

I have couple of suggestions for you if you are up to it.

- Try doing a bit of frequency restoration on your image - using wavelets transform like it's done in planetary imaging. This will make rather noisy image but rate of expansion should be easier to see.

- Maybe do calculation vs measurement on your image?

We have approximate distance to the object and measured expansion rate of 1500m/s - it's rather easy to calculate what sort of angular size difference there would be in 20 years. You can then compare that with measurements from these two images - measure difference in pixels and convert to arc seconds from sampling rate of your system.

[adamphillips]

8 hours ago, vlaiv said:

Very nice indeed.

I have couple of suggestions for you if you are up to it.

- Try doing a bit of frequency restoration on your image - using wavelets transform like it's done in planetary imaging. This will make rather noisy image but rate of expansion should be easier to see.

- Maybe do calculation vs measurement on your image?

We have approximate distance to the object and measured expansion rate of 1500m/s - it's rather easy to calculate what sort of angular size difference there would be in 20 years. You can then compare that with measurements from these two images - measure difference in pixels and convert to arc seconds from sampling rate of your system.

yes I do know the calculation for size with known distance and arcseconds. it would be tough to get it perfect but I might try it out. im kinda nerdy like that. im just think it would be pretty approximate based on these two different images. but it will be fun