UPDATE: Here it is, Rosetta’s last image taken shortly before impact at an altitude of 20 m above the surface of Comet 67P/Churyumov-Gerasimenko (not 51 m as previously reported).
Rosetta’s last image of Comet 67P/Churyumov-Gerasimenko, taken shortly before impact at an altitude of 20 m above the surface. The image was taken with the OSIRIS wide-angle camera on 30 September. The image scale is about 5 mm/pixel and the image measures about 2.4 m across. #CometLanding
[UPDATE: The initially reported 51 m was based on the predicted impact time. Now that this has been confirmed, and following additional information and timeline reconstruction, the estimated distance is now thought to be around 20 metres, and analysis is ongoing.]
http://www.esa.int/spaceinimages/Images/2016/09/Comet_from_51_m_wide-angle_camera