Rotation of Jupiter First Try (Steve Lantz)

Contains: Solar system body or event

Rotation of Jupiter First Try

I had to take the dogs out at 3:30 am, saw Jupiter and went for it. Through the eyepiece things looked promising. But my antique mount for my 10 inch Newtonian failed me -- the RA axis kept slipping and I ended up having to manually get Jupiter in the frame (no controllable motors for Dec and RA) and hold the counterweight shaft with enough pressure to offset the slip -- which worked pretty poorly because of vibration and some uncorrected drift. After each of about 20, 15s videos with around 10 minutes every time Jupiter drifted out of the field when I let go of the counterweight shaft, I was soon battling the light of dawn and deteriorating seeing. All in all, using stacking of 24 frames per video out of 960 frames I was able to generate 10 images which were not terrible, more or less. I decided not to waste the images so I set out to make a gif of Jupiter rotating over about an hour's time. The ten images were not evenly distributed over time so I used WinJUPOS to take one of my images either at the beginning or end of a gap and rotate them to the times during the gap that I needed more images. In this way I generated another 5 images for 15 total. I then made a gif. The rotation is not perfectly free of skips, but the synthetic images helped. All of this is a trial effort (1) to not waste some hard earned images and (2) to practice the technique of making gifs of Jupiter rotating. Now I have to think about getting a modern mount for the telescope and a night of good seeing to hopefully put the real thing together!

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