How big?

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Gfamily
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How big?

#1

Post by Gfamily »

In preparing the slides on "What's Up In December" for our astro club, I mentioned the upcoming conjunction of Jupiter and Saturn, and included the attached showing the conjunction relative to the size of the full moon.
Screenshot_20201129-111940__01__01__01__01.jpg
In looking a bit more at the scale of the orbits of Jupiter's outer moons, I was astonished to find that the diameter of the orbits would cover 3° across the sky - at Jupiter's current position (about the width of Orion's Belt.
Screenshot_20201129-113230.jpg
When at opposition (and therefore at about the closest distance) the outermost moons orbits would cover 5° of the sky - more than the distance between Castor and Pollux.

It surprised me at least.
LS8 Meade SCT
SW 127 Mak
Star Adventurer
www.midcheshireastro.co.uk for astro company
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helicon
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Re: How big?

#2

Post by helicon »

Definitely surprising!
-Michael
Various scopes, 10" Zhumell Dob f/4.9, ES AR152 f/6.5, AWB 5.1" Onesky newt, Oberwerk 25x100 binos, two eyeballs. Camera: ZWO ASI 120
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Gfamily
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Re: How big?

#3

Post by Gfamily »

And as of today, Pasiphae (one of the outer moons) is further from Jupiter than Saturn is.
Pasiphae.PNG
LS8 Meade SCT
SW 127 Mak
Star Adventurer
www.midcheshireastro.co.uk for astro company
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