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Cities at night: Extraordinary Rosetta images

OSIRIS image of urban regions on Earth

14 November 2007
ESA's Rosetta has returned extraordinary images captured 13 November 2007 as the comet-chasing spacecraft completed a critical Earth swing-by at 45 000 kilometres per hour.

The images - captured by Rosetta's OSIRIS instrument - comprise a view of the Earth's night side including urban regions in Asia, Africa and Europe, and a view of the Earth's limb over Antarctica.

The first image was taken with the OSIRIS Wide Angle Camera (WAC) at 19:45 CET, about 2 hours before the closest approach of the spacecraft to Earth. At the time, Rosetta was about 80 000 km above the Indian Ocean where the local time approached midnight (the angle between Sun, Earth and Rosetta was about 160°).

Islands of artificial lights created by human habitation are sparsely distributed over the part of the globe seen in the picture.

Scroll down for an annotated version.

Earth's limb high over Antarctica

Earth limb seen by OSIRIS

This image was taken with the Wide Angle Camera (WAC) at 20:05 CET, about 2 hours before the closest approach of the spacecraft to Earth. At the time Rosetta was about 75000 km from Earth. A sun-illuminated crescent can be seen around Antarctica. The image is a colour composite combining images obtained at various wavelengths.

OSIRIS image of urban regions on Earth - annotated

This is an annotated version of the first image, showing various geographical and population features.

The images were captured between 19:45 and 20:05 CET, about two hours prior to Rosetta's gravity-assist passage past Earth, as the spacecraft flew 75 000 to 80 000 km over Earth's surface.

OSIRIS

The image series was captured by the spacecraft's OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) instrument, which includes a wide-angle camera and a narrow-angle camera to obtain high-resolution images of the destination comet's nucleus and the asteroids that Rosetta passes on its voyage to Comet 67P/Churyumov-Gerasimenko.

OSIRIS will also help in identifying the best landing sites for the on-board lander. The Principal Investigator is H.U. Keller, of the Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany.

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