English: A colour image of Comet 67P/Churyumov-Gerasimenko composed of three images taken with the Narrow Angle Camera (NAC) of the scientific imaging system OSIRIS in red (centred at 744 nm wavelength), green (536 nm), and blue (481 nm) filters on 6 August 2014 from a distance of 120 kilometres. The image covers roughly 4 x 4 km at a resolution of about 3.9 metres per pixel.
Rosetta’s OSIRIS team have produced a colour image of Comet 67P/Churyumov-Gerasimenko as it would be seen by the human eye. As anticipated, the comet turns out to be very grey indeed, with only slight, subtle colour variations seen across its surface.
To create an image revealing 67P’s “true” colours, the scientists superposed images taken sequentially through filters centred on red, green, and blue wavelengths.
“As it turns out, 67P/C-G looks dark grey, in reality almost as black as coal,” says the instrument’s Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS).
As explained in earlier blog posts for the NAVCAM images, the intensity of the images has been enhanced to span the full range from black to white, in order to make surface details visible. But the colours have not been enhanced: the comet really is very grey.
A more detailed first analysis nevertheless reveals that the comet reflects red light slightly more efficiently than other wavelengths. This is a well-known phenomenon observed at many other small bodies in the Solar System and is due to the small size of the surface grains. That does not, however, mean that the comet would look red to the human eye. Natural sunlight peaks in the green part of the spectrum and the response of the human eye is similarly matched. Thus, overall, the comet would look rather grey to the human eye, as seen here.
ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
Lisanslama
This photography is a RosettaOSIRIS image created by the European Space Agency (ESA). Per the ESA website: All Rosetta OSIRIS images are released under the CC BY-SA 4.0 license. The user is allowed to reproduce, distribute, adapt, translate and publicly perform this publication, without explicit permission, provided that the content is accompanied by an acknowledgement that the source is credited as "ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA – CC BY-SA 4.0". A direct link to the license text must be provided along with a clear indication if changes were made to the original content. Any changes, adaptations, translations, or derivatives of this image must be published under the same license terms (CC BY-SA 4.0). The user must not give any suggestion that ESA or the OSIRIS team necessarily endorses the modifications made. No warranties are given. To the uploader: You must provide a link (URL) to the original file and authorship information if available. Processing information for the OSIRIS images in the image browser: Original image provided as .IMG file in the archive delivery from: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA – CC BY-SA 4.0 Original image was processed by ESA/Rosetta/SGS/PSA&ESDC to create image for the Archive Image Browser
Atıf: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA – CC BY-SA 4.0
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