GRS and Jupiter's Rotation

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jrkirkham United States of America
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GRS and Jupiter's Rotation

#1

Post by jrkirkham »


Has anyone on here taken time to watch Jupiter's Great Red Spot as it moves past the central meridian? I think Sky & Telescope's app looks like the best online source for timings. How long before it reaches the central point should I start watching? How long does it take from first contact to last contact with the central meridian?
Rob
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Re: GRS and Jupiter's Rotation

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Post by Star Dad »


A 10 hour rotation. I saw the GRS just past center and then 3 hours later it was half over edge. So you are basically talking the rotation of 3 widths time. so let's see that would be about 30,000 miles and Jupiter's diameter is 88,000 miles... so let's make it easy 3/9ths of 5 hours = 1.66 hours give or take.
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Re: GRS and Jupiter's Rotation

#3

Post by JayTee »


I use calsky.com. I found it to be a better user interface and just as accurate as S&T.

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Re: GRS and Jupiter's Rotation

#4

Post by jrkirkham »


Thank you. Those are helpful comments.
Rob
Telescopes: 50mm refractor, ED80 triplet, 90mm makcass, 10" dob, 8"SCT, 11"SCT
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Re: GRS and Jupiter's Rotation

#5

Post by Lady Fraktor »


As planetary viewing is one of my favorite things I watch the GRS as much as possible.
I have used Calsky for years for observation planing. An excellent tool.
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Re: GRS and Jupiter's Rotation

#6

Post by jrkirkham »


On the charts it looks like the GRS will transit the central meridian at 11:50 CDT, my time. I live in west central Illinois. Perhaps I'll get lucky and see it.
Rob
Telescopes: 50mm refractor, ED80 triplet, 90mm makcass, 10" dob, 8"SCT, 11"SCT
Mounts: Celestron CGX, Orion Sirius + several camera tripods
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Re: GRS and Jupiter's Rotation

#7

Post by jrkirkham »


Thank you for your help everyone. I had a good night out and came away with a couple of pictures and times of the GRS. In one picture I think I caught it just about as central on the meridian as possible. The shadow of Ganymede is just above the GRS and Io is just to the left of the planet. The transparency was great, but seeing was terrible. The stars were twinkling to the zenith and if I tried to add more power to the camera Jupiter danced around like a bouncy blob. I was going to try and get a third shot, but the conditions didn't hold, so I quit and went to bed.
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GRS crossing the central meridian  lr.jpg
Rob
Telescopes: 50mm refractor, ED80 triplet, 90mm makcass, 10" dob, 8"SCT, 11"SCT
Mounts: Celestron CGX, Orion Sirius + several camera tripods
Cameras: Canon 6D, Canon 80D, ZWO-ASI120MC
Binoculars: 10x50, 12x60, 15x70, 25-125x80
Observatory: SkyShed POD XL3 + 8x12 warm room
AL Projects Completed: Lunar #645, Outreach #0280, Universe Sampler #93-T, Binocular Messier #871, Messier #2521, Messier Honorary #2521, Constellation Hunter Northern Skies #112, Planetary Transit Venus #1, Galileo #26, Outreach Stellar 0280, Meteor Regular #157, Solar System Telescopic #209-I, Observer Award #1
AL Projects Currently in Process: Double Stars, Comet, Lunar Evolution
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