Dusty iceballs left over from the birth of the Solar System, comets are most famously known for their tails: long diffuse veils of ejected gas and reflective frozen material streaming out from their nucleus millions of miles away from the Sun. And even though we’ve typically been seeing it as a rugged rubble pile, Rosetta’s comet 67P/Churyumov-Gerasimenko is jetting material out into space – as seen in this beautiful contrast-enhanced OSIRIS image acquired on November 22.
The closer comet 67P gets to the Sun, the more active its jets will become as volatile material beneath its surface is warmed and sublimates. Currently over 517 million km away, 67P will reach perihelion on August 13.
“This is still the beginning of the activity compared to what we expect to see in summer this year,” says OSIRIS principal investigator Holger Sierks from the Max Planck Institute for Solar System Research in Germany. “From the last perihelion passage we know that the comet will evolve by a factor of 100 in activity at that time compared to now.”
Captured from a distance of 30 km from Comet 67P/C-G, the image resolution is 2.8 meters per pixel.
(And if you’ve ever wondered how a comet that is darker than coal can look so bright in images, click here to find out.)
Unlike NAVCAM images, which are released fairly regularly by the Rosetta team, high-resolution OSIRIS images are managed by a different organization and are released to the public much less frequently. As such, every one is seen as a treat by space fans!
Image credit: MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA