Hello, Pluto!

Images obtained by OSIRIS, Rosetta’s scientific imaging system, show dwarf planet Pluto shortly before the flyby of NASA's New Horizons.  On Sunday 12 July 2015, OSIRIS, the scientific imaging system on board ESA’s spacecraft Rosetta, took a glance away from Comet 67P/Churyumov-Gerasimenko to the edge of our Solar System, towards Pluto. Over five billion kilometres away, an exposure time of more than three hours, and sophisticated image processing, was necessary to detect Pluto in the images. Twenty images, each exposed for ten minutes, had to be stacked and carefully processed to reveal the tiny world. Pluto is thus the most distant body within the Solar System that Rosetta has ever looked at. NASA’s space probe New Horizons made its historic flyby of this distant world today, passing within about 12500 km. Being able to discern the 2370 km-wide body in OSIRIS images comes close to a small miracle, say the imaging team. “After all, OSIRIS is not a telescope, but a camera system designed to study Rosetta’s comet from up close," says OSIRIS Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS) in Germany. "Apart from the huge distance there was another difficulty," says OSIRIS team member Dennis Bodewits from the University of Maryland who worked on the images. “Comet 67P and Rosetta are by now surrounded by a dense atmosphere of gas and dust. It’s like watching Pluto through a blizzard.” The observation is particularly symbolic given that both Pluto and Comet 67P/C-G hail from the Kuiper Belt in the Outer Solar System. Comet 67P/C-G is now a Jupiter Family Comet and is currently in the inner Solar System, a month away from perihelion, the closest point to the Sun along its orbit. Pluto is a dwarf planet residing in the Kuiper Belt, and has an elliptical orbit around the Sun. Rosetta has imaged a number […]

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