Saturday, May 12, 2018

sorted Jupiter issues

Chris shared a link to some Jupiter opposition imagery by Nikita Misiura. It included a short video showing the gas giant turning with a moon transiting. Nicely done.

Reminiscing of our backyard observing at very low power, I showed Rhonda. She enjoyed it. Then she said she liked the shadow as well. Huh? I argued she was mistaken, that it was the outline of the moon. But she was right. On closer examination, I could see a very faint shadow falling on the cloud tops offset from the moon, right where rho said it was, at the 5 o'clock position. I don't call her Hawkeye for nothing.

I offered to simulate it in software. First, I checked the AstroBin link in search of details. I immediately encountered my first issue. The AstorBin page did not render correctly at all, no graphics. I gave up reloading after several attempts and just noted the key fields.
  • Date: May 8, 2018
  • Time: 05:22
  • Locations: Houston, TX
I suspected the time was local and not UT. I recreated the instance in SkyTools 3 Professional and didn't see anything. After some fiddling, I got a moon transiting, along with it's shadow, around 5:22 AM CST, May 9. But it wasn't Io.

simulated view of Jupiter and Europa

Pinged Chris and reported my findings. He concurred.

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