If you’ve ever wondered what it would be like to fly over a comet in a jet airplane, soak in these photos. This past Saturday, the Rosetta spacecraft swung within 3.7 miles (6 km) of the surface of Comet 67P/C-G. Pictures for the mosaic image (above) were taken from an altitude of just 29,000 feet, nearly 10,000 feet lower than a typical transatlantic flight.
It really is like looking out the plane window especially when you consider you’re viewing a chunk of landscape barely a mile across. You and I could walk across that mosaic in less than 20 minutes! Assuming no obstacles of course.
Closest approach occurred over the Imhotep region on the comet’s large lobe. What caught my eye was the long, layered mesa-like feature in the lower left of the frame. In the cropped version, you can make out the outlines of several raised, near-circular structures with smooth floors. Boulders, ranging in size from 12 feet (a few meters) to a 35 feet (10 meters) lie scattered across the whole surface of the comet. The big boulder near the top of the mosaic and seen up close below is named Cheops. It’s 148 feet or about 45 meters across.
Download the mosaic to your desktop and take a few minutes to explore it. You’ll find flows, depressions, more of of those circular features and a delightful assortment of boulders of all shapes and sizes. What are those things – dust-covered ice chunks?
Rosetta is now moving out for a far view of the comet and will reach a distance of about 158 miles (255 km) from the comet’s center tomorrow. Stop by in a day or two for new pictures of 67P’s atmosphere or coma. In the meantime you can download a zip file of the 16 individual frames comprising the mosaic here.