Why Do Stars Have Spikes? ( JWST star diffraction spikes explained )

Рет қаралды 1,100

4 күн бұрын

This video demonstrates where star spikes come from in the Hubble and Webb space telescopes. I show how to add them if you like them, or remove them if you don't.
#stars #Hubble #jwst #telescope #astronomy #diffraction
3D Printable Diffraction Spike Mask by fdoffin: www.thingiverse.com/thing:126...
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KZfaq NOTES:
1) This video complies with the KZfaq Community Guidelines and Terms of Service.
2) All sound tracks and sound effects were used with permission from my video editing suite, Camtasia.
3) This video does not contain offensive material, children, or bad language.
Questions Answered:
1) What causes stars to have spikes?
2) What are diffraction spikes?
3) Can we eliminate diffraction spikes?
#dobsonian #diffraction #aigrettes
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#reflector
#reflactor
@reflactor

Пікірлер: 38

@factChecker01 Күн бұрын

Very interesting! One thing I like about the diffraction spikes is that you can tell which are stars and which are galaxies.

@reflactor Күн бұрын

Yes. They do come in handy in several circumstances like that.

@hednik 2 күн бұрын

Something I never knew before! Thanks!

@johngiromini5745 2 күн бұрын

Those batwings are pretty neat; hadn't seen them before. I worked on the SmartSense Explorer DX 130AZ this afternoon. And now a word from our sponsor: NoSweat Spritzer. It's a spray application and totally seals the skin pores to prevent the expulsion of sweat. Of course, the body swells up but hey, everyone needs a way to be funny. Now back to our regular program. I worked on getting the 130AZ "aligned" better by just using a cap hole. And while the image is in focusa, I'm not sure it improved. Fixed the red dot finder scope. Put the 25mm lens in and it looked great; nice sharp image. Packed it up and sent it back to the client. Will need to establish a time to actually view something at night preferably in December.

@reflactor 2 күн бұрын

Congrats on getting it all fixed up. It's always a challenge when the bolts won't come loose, lol. Hopefully there were no broken bolts involved!

@Acc-kb9mf 2 күн бұрын

I have always wondered what the visible contribution of the support obstructions is. Very cool to finally know

@reflactor 2 күн бұрын

This was a really fun subject to dive into. Thank you for watching!

@dff19707 Күн бұрын

I’ve never heard of these batwings, and, truthfully, I’ve never seen a discussion about diffraction spikes. So, this was a fascinating video on how to cause and diminish diffraction spikes. I don’t see me trying batwings, though, because I like diffraction spikes. That said, I still think of Pluto as a planet, so YMMV.

@reflactor Күн бұрын

Thanks for watching - this was a fun experiment. There are 3D printable masks made for specific refractors whose sole purpose is to add diffraction spikes. I guess people just expect to see them! Personally, I prefer the diffraction spikes too!

@BA-cn3rk 12 сағат бұрын

All your videos are so helpful !! I did know about diffraction spikes, since I use both reflectors and refractors, but I didn't know that the curved holders prevented them. (I like learning something everyday) I like the spikes in my images, it adds beauty to the stars. I use a Bahtinov mask for focusing, but I've found that just using the diffraction spikes for focusing does just as well. Get them as thin as possible. Keep up the good work.

@reflactor 10 сағат бұрын

I'm glad you found it interesting. Thank you for watching!

@BobGeogeo 2 күн бұрын

I believe diffraction spikes have been used in research as a way to find the center of the image of a bright star.

@reflactor 2 күн бұрын

That's pretty fascinating. Thank you for sharing!

@curronhill2744 Күн бұрын

Very interesting, i prefer to not have them in my astro photos, but like them on the star atop our Christmas tree!

@reflactor Күн бұрын

Yes, they look good in some photos for sure. :)

@FelipeCardimF Күн бұрын

Amazing content as always! Cheers from Brazil!

@reflactor Күн бұрын

Wow, all the way from Brazil! Thank you for watching!

@AmatureAstronomer 2 күн бұрын

I have diffraction spikes when using my reflectors, but not when using my refractors. Oh, like he said.

@reflactor 2 күн бұрын

Same here. In the video, I show how you can add diffraction spikes back into your refractor images (using pizza box cardboard).

@SonoranAstro Күн бұрын

hahaha i’m guilty of using guitar wire on my 70-200 lens to get diffraction spikes 😂 i love the look of them

@reflactor Күн бұрын

Now that's an interesting way to generate them!

@tommes9537 Күн бұрын

great video. I learned a lot. Thanks

@reflactor Күн бұрын

Thank YOU for watching. Clear skies!

@eparhas9162 5 сағат бұрын

Ive always considered it best to go with whats natural for the scope. Adding them to refractors or removing them from reflectors seems equally silly to me

@reflactor 2 сағат бұрын

It was eye opening for me. On Thingiverse, there are special masks made for specific refractors just to add in diffraction spikes. Everybody has their preference. :) I personally like the spikes.

@Slartyfartblarst Күн бұрын

Educational.

@reflactor Күн бұрын

Thank you for watching. Clear skies!

@tubedude54 Күн бұрын

Very interesting. I did learn something I didn't know, which is now so obvious once you mentioned it, and that was that the Webb has 8 spikes and not the 6 I figured it did. Also, how much light is blocked by the 'bat' wings?

@reflactor Күн бұрын

It's kindof a neat bit of trivia because the horizontal diffraction spikes are on the short side. I didn't notice any reduction in light from the batwings.

@tubedude54 Күн бұрын

@@reflactor Well, we both know they have an impact just like the secondary does in blocking light... I'll leave it to you to calculate their area though as that's a 'few' years past my last calculus class! lol

@dumpydalekobservatory Күн бұрын

Ah diffraction spikes the Marmite of astronomy you either love them or hate them, I must be weird as I hate them whereas my other half loves them. I've seen Newtonians with curved & weird shaped spider vanes to try & stop them to.

@reflactor Күн бұрын

You either love them or hate them. :) Thank you for watching.

@robertsonsid Күн бұрын

That GSKYER star image isn't that great. I wonder if the collimation (hard to adjust in that unit) is off. I have a used Meade 90mm that gave awful images until I discovered the previous owner had the objective flipped over. Excellent video!

@reflactor Күн бұрын

You are correct. Aside from the primary lens, the Gskyer is pretty nice. The tripod is good. Vixen mount. Fantastic rack & pinion (no slop!). And yet, the primary lens is not good. Just.... barely acceptable. Thanks for watching! (I'll have to see if the previous owner took it apart and flipped it!)

@glhmedic 2 күн бұрын

Are still playing on a video dealing with power seeker 127 scope?

@reflactor 2 күн бұрын

I am. I have a big pipeline of videos lined up. :)

@AmatureAstronomer 2 күн бұрын

@@reflactor I have been thinking of buying a "power seeker 127", proportly the worst telescope in the world. Sounds lie a challenge to use for celestial photography.

@glhmedic 2 күн бұрын

@@reflactor ok sorry to bother you.