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Ian ReganMay 16, 2017

Cassini's 'Grand Finale' Portrait of Saturn

In the early hours of April 13, 2017, a veteran NASA probe captured this breathtaking and unique visage of the Saturnian system as it coasted through space in the shadow of the gas giant.

Cassini's “Grand Finale” Saturn portrait (13 April 2017)

NASA / JPL-Caltech / SSI / Ian Regan

Cassini's 'Grand Finale' Portrait of Saturn
Cassini captured 96 individual photos on April 13, 2017, used to create this stunning mosaic of the ringed planet.

Using its Wide-Angle Camera (part of the Imaging Science Subsystem), Cassini snapped 96 individual digital photos: these images consisted of Red, Green, and Blue-filtered frames, covering a total of 32 ‘footprints’. These 32 color frames were painstakingly combined to produce the final mosaic.

The veteran spacecraft took nearly four hours to collect these data. In that time, Cassini was slowly cruising away from the planet, en route to apoapse (the point farthest from Saturn in any given orbit) of Revolution 269. The distance to the planet increased by 82,000 km in that time, and in the end, the distance to the cloud-tops equaled 650,040 km.

All components of the main ring system are visible, seen here illuminated from behind: a vantage point technically known as a ‘high-phase angle’. In this geometry, a peculiar reversal happens: the thinner and more translucent rings shine out brightly, while the more opaque and thicker regions are relatively dark.

Only two moons — Janus and Mimas — can be picked out in this uncalibrated and compressed data, in addition to a red-giant star in the constellation of Gemini: Tejat (μ Gem).

For more information about the Cassini-Huygens mission visit and The Cassini imaging team homepage is at

Read more: pretty pictures, Cassini, data art (was amateur image processing), Saturn's irregular moons, full-globe view, Saturn, explaining image processing, Mimas, Saturn's rings

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Ian Regan

Contributor for Apollo Lunar Surface Journal
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