A catalog of stereo anaglyphs of comet 67P/Churyumov- Gerasimenko - Application to the detection of deep ice pits

Philippe Lamy (1) , G. Faury (2) , D. Romeuf (3) , Olivier Groussin (4) , Joelle Durand (5)

1 PLANETO - LATMOS
2 IRAP - Institut de recherche en astrophysique et planétologie
3 UCBL - Université Claude Bernard Lyon 1
4 LAM - Laboratoire d'Astrophysique de Marseille
5 CNES - Centre National d'Études Spatiales [Toulouse]

The OSIRIS/NAC camera aboard the Rosetta spacecraft has acquired approximately 27000 images of comet 67P/Churyumov-Gerasimenko at spatial scales down to a few centimeters. We exploit the numerous sequences of images separated by a few minutes suitable for stereo reconstructions to produce anaglyphs offering three-dimensional views of the comet, complementary to other technics, as a tool to understand the topography of the nucleus. Each anaglyph is documented by a set of 17 parameters which provide the contextual information. Over 1400 anaglyphs have been produced and cataloged so far; they are available on a dedicated website and can be searched using the associated parameters. As a first application, we present direct evidences of sub-surface ice at the bottom of deep pits, so-called "ice pits" identified on high-resolution anaglyphs. Their geometry and size are obtained from stereographic reconstruction. Both their high reflectivity and their blue color substantiate the presence of ice.

Domaines: Planète et Univers [physics]

Philippe Lamy, G. Faury, D. Romeuf, Olivier Groussin, Joelle Durand. A catalog of stereo anaglyphs of comet 67P/Churyumov- Gerasimenko - Application to the detection of deep ice pits. EPSC-DPS Joint Meeting 2019, Sep 2019, Geneva, Switzerland. pp.EPSC-DPS2019-719-1. ⟨insu-02334508⟩