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OUTER PLANETS
You are entering the Jovian Twilight Zone
by Staff Writers
Pasadena CA (JPL) Mar 06, 2018

JunoCam's raw images are available for the public to peruse and process into image products here. Image courtesy NASA/JPL-Caltech/SwRI/MSSS/Gerald Eichstadt. For a larger version of this image please go here.

This image captures the swirling cloud formations around the south pole of Jupiter, looking up toward the equatorial region.

NASA's Juno spacecraft took the color-enhanced image during its eleventh close flyby of the gas giant planet on Feb. 7 at 7:11 a.m. PST (10:11 a.m. EST). At the time, the spacecraft was 74,896 miles (120,533 kilometers) from the tops of Jupiter's clouds at 84.9 degrees south latitude.

Citizen scientist Gerald Eichstadt processed this image using data from the JunoCam imager. This image was created by reprocessing raw JunoCam data using trajectory and pointing data from the spacecraft. This image is one in a series of images taken in an experiment to capture the best results for illuminated parts of Jupiter's polar region.

To make features more visible in Jupiter's terminator - the region where day meets night - the Juno team adjusted JunoCam so that it would perform like a portrait photographer taking multiple photos at different exposures, hoping to capture one image with the intended light balance. For JunoCam to collect enough light to reveal features in Jupiter's dark twilight zone, the much brighter illuminated day-side of Jupiter becomes overexposed with the higher exposure.

JunoCam's raw images are available for the public to peruse and process into image products here


Related Links
Juno at SWRI
The million outer planets of a star called Sol


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OUTER PLANETS
Europa and Other Planetary Bodies May Have Extremely Low-Density Surfaces
Tucson AZ (SPX) Jan 25, 2018
Spacecraft landing on Jupiter's moon Europa could see the craft sink due to high surface porosity, research by Planetary Science Institute Senior Scientist Robert Nelson shows. Nelson was the lead author of a laboratory study of the photopolarimetric properties of bright particles that explain unusual negative polarization behavior at low phase angles observed for decades in association with atmosphereless bodies including asteroids 44 Nysa, 64 Angelina and the Galilean satellites Io, Europa and G ... read more

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