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Juno is in a highly elliptical orbit, which will take it within 5000km of Jupiter's cloud tops. This photo was taken from much further away than that. In short, check back in about a month. :)

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Agreed, and to add more detail for comparison - the current distance is around 2 million kilometers, so resolution should jump by a factor of about 500 (per dimension, not number of pixels) at closest range.

EDIT: For a comparison to Hubble - at closest approach JunoCam will get 5 kilometers per pixel [1], while Hubble gets in the region of 120 kilometers per pixel [2]. So, giant jump in quality, though the field of view from up close will be limited.

[1] http://planetary.org/blogs/emily-lakdawalla/2011/3133.html

[2] http://www.spacetelescope.org/images/heic0910q/

Current distance is 2.7 million miles, or 4.3 million km, according to the NY Times caption.

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