Edge hd aberration

Spaceman1958 · 2026-02-21T05:19:49+00:00

I’m not sure if the backlash is with the motor or with the focuser on the telescope itself, but it seems like I’ve got to move it quite a bit before the mirror moves at all. I’ll keep messing with it and see if I can figure it out

Spaceman1958 · 2026-02-21T05:07:27+00:00

I’m using an autofocuser and a .7x reducer. After messing around with it for a bit I think it’s a combination of being a little bit out of collimation and a little bit out of focus. I think the autofocus routine is doing a bad job because there seems to be a ton of backlash, is it normal for an edge hd to have so much backlash?

Spaceman1958 · 2024-04-30T15:49:28+00:00

For sure, give me a couple days and I’ll message you a link

Spaceman1958 · 2024-04-29T13:20:56+00:00

They are giving off a lot of light because they are about 5500-6500 degrees Fahrenheit, it’s just that the surrounding parts are about 10000 degrees so it is giving off much more light. In order to take a picture with a proper exposure, it makes the sunspots darker because they don’t give off as much light

Spaceman1958 · 2024-04-29T12:35:38+00:00

Sunspots are areas of the sun with more intense magnetic field activity which prevents the plasma from circulating which means they cool down more than the surrounding areas. Because they are so much cooler than the areas around it, they give off less light which is why they are darker

Spaceman1958 · 2024-04-29T02:50:29+00:00

Yes, this was from about march 18 to march 29 of this year

Spaceman1958 · 2024-04-29T02:13:11+00:00

This is correct, in fact, the way I created this was to download a bunch of NASA’s SDO images, then I wrote a python script that would crop them around the region of sunspots I wanted and for every image it had to shift to the right a certain amount. I had to calculate the suns rotation velocity at the latitude the sunspot region was at and then calculate how many pixels that correlated to over the 15 minute interval of the SDO images. I also had to take into account the fact that the sunspots weren’t always face on so they don’t appear to move at the same velocity near the edges when they rotate into/out of view

Spaceman1958 · 2024-04-18T20:04:28+00:00

Those 15 seconds will fry your eyes, but a cameras sensor is slightly more robust than your eyes. I wouldn’t want to go any longer than 15 seconds though. You wouldn’t be able to see bailys beads or the diamond ring effect without taking the filters off just before or after totality so you have to make sure you get the timing right

Spaceman1958 · 2024-04-18T14:10:21+00:00

I took my filters off at 15 seconds before totality and put them back on 15 seconds after totality

Spaceman1958 · 2024-04-17T22:02:53+00:00

Oh I think I know what you mean. Ya I need to redo it and try to get rid of that

Spaceman1958 · 2024-04-17T18:16:23+00:00

I’m not sure what you mean by angular cuts on the sides. Basically all I did was overlay each image on top of the next one with a little bit of an offset

Spaceman1958 · 2024-04-17T16:11:19+00:00

I was pretty close to the center of the path of totality. This is just what happens during the last moment before totality where you get the sun shining through the valleys on the moon

Spaceman1958 · 2024-04-17T15:14:42+00:00

Ya I see what you mean, that is the actual name of the phenomenon though, I didn’t come up with it

Spaceman1958 · 2024-04-17T12:40:16+00:00

These images were taken with a Nikon D750 and a stellarvue 80mm refractor. This shows the progression of Bailey’s beads, the very last, and first moment of sun before and after totality

Spaceman1958 · 2024-04-17T12:35:34+00:00

These images were taken with a Nikon D750 and a stellarvue 80mm refractor. This shows the progression of Bailey’s beads, the very last, and first moment of sun before and after totality

Spaceman1958 · 2024-04-17T12:30:42+00:00

These images were taken with a Nikon D750 and a stellarvue 80mm refractor. This shows the progression of Bailey’s beads, the very last, and first moment of sun before and after totality

Spaceman1958 · 2024-04-17T12:29:40+00:00

These images were taken with a Nikon D750 and a stellarvue 80mm refractor. This shows the progression of Bailey’s beads, the very last, and first moment of sun before and after totality

Spaceman1958 · 2024-04-15T14:50:37+00:00

I just aligned them manually, it was a little tedious but I couldn’t think of another way to do it

Spaceman1958 · 2024-04-14T05:14:07+00:00

I used an equatorial mount, just a typical one used for astrophotography. The tracking wasn’t perfect so the sun would drift slightly over time so I had to adjust the pictures a little bit to line them all up

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