Under normal guiding circumstances, DEC doesn't move, but we can pulse it to account for cyclic error, or missing polar alignment. When it is pulsed, it is tight against one side of the worm gear or the other, and the motor is stopped again, correct?

The next adjustment would use the full backlash, or no backlash, depending on the direction of the previous adjustment. If the direction is the same as previous, the worm is tight and no backlash should be added to the pulse. If the direction is opposite the last pulse, the full backlash comes into play and should be added before the mount would move the scope. I don't understand why a percentage would be used here. I would rather that the variability is accounted for in the pulse width, and not the backlash, where we already have some ability to set things like aggressiveness. The backlash is fairly fixed for a session I would think. The caveat being a meridian flip where the first pulse might be way off. It could be off by as much as 2x the backlash, but after the first correction, the full or nothing works again.

Read More...

Isn't the calculation more involved than a percentage? For example, if I am not guiding, my mount will be tight against the worm gear on one side with just tracking. The worm is already engaged at one side of the backlash. If the guide pulse is additive in the direction of the tracking, you would want to add in all the backlash to the pulse. If the pulse is slowing tracking, it is already against the engaged worm gear and you would want to apply no backlash adjustment, just the straight up calculated pulse.

Read More...

Jim replied to the topic 'ASI driver sends image after ABORT' in the forum. 2 weeks ago

I just experienced this for the first time last night on a fresh build off master. I, too, expect an aborted capture to be discarded, and am quite certain it was in the past. This is easy to reproduce as well. Start capturing with guiding, set things up to abort if guiding is lost, and manually abort the guiding. The frame being captured will be written, and the new exposure starts from the time left when in this mode.

I had some guiding issues last night that had this manifest multiple times. I have things set to abort if the guide deviation is above a threshold, and at one point it did abort after abort and wrote frames, increasing the frame count each time until my set 30 frames was expended. They ended up being all junk, of course as there was no duration to the exposure. This seems to be a very recent change as I do not recall this happening before.

Jim

Read More...

The arm architecture is compiled for Fedora with a cross-compilation, so it certainly can be done. It is just a question of where you want to spend your time to keep the build configuration up to date vs. building natively.

copr.fedorainfracloud.org/coprs/xsnrg/ks...eding/build/2618948/

If you are so inclined, there are compilation logs linked in there that may help with cross-compiler flags to use.

Read More...

Jim replied to the topic 'Discord server?' in the forum. 1 month ago

I'd be game to give it a try if somebody sets one up. Slack is another option that allows live calls, screen sharing, etc.

Read More...

I do wonder if the simple sine oscillation is a tumbling satellite. If so, it being non-uniform in shape would catch sunlight in a repeating pattern. An example, consider a satellite with solar panels off each side. If it is spinning as it travels, then one side solar panel will catch the light and then the other.

The other thing I thought about is it could still be a mount issue. The stars in the attached image seem to be oblong in the same direction as the peaks of the sine wave. If the satellite travel was perpendicular to the error in the mount, it would show up the most vs the lower, fainter trail in the right corner, the fainter trail runs more parallel to the potential mount error. Parallel to the error would greatly reduce the magnitude of the error appearing in the trail as a much larger component of the oscillation is along the trail instead of perpendicular to it.

It seems too linear and uniform in pattern to be a firework I think.

Read More...

Jim replied to the topic 'New Targets tool?' in the forum. 2 months ago

There is a website that I use for this, telescopius.com/. Having this function in one place would be quite nice. Telescopius does have some other features that are neat such as uploading your own images that would not make sense, so it still has its place too.

Jim

Read More...