Close-up images of the final Philae landing site on comet 67P/Churyumov-Gerasimenko acquired by the ROLIS camera

被引：20

作者：

Schroeder, S. E. ^{[1
]}

Mottola, S. ^{[1
]}

Arnold, G. ^{[1
]}

Grothues, H. -G. ^{[2
]}

Jaumann, R. ^{[1
]}

Keller, H. U. ^{[1
,3
]}

Michaelis, H. ^{[1
]}

Bibring, J. -P. ^{[4
]}

Pelivan, I. ^{[1
]}

Koncz, A. ^{[1
]}

Otto, K. ^{[1
]}

Remetean, E. ^{[5
]}

Souvannavong, F. ^{[6
]}

Dolives, B. ^{[6
]}

机构：

[1] Deutsch Zentrum Luft & Raumfahrt DLR, D-12489 Berlin, Germany

[2] Deutsch Zentrum Luft & Raumfahrt DLR, D-53227 Bonn, Germany

[3] Tech Univ Carolo Wilhelmina Braunschweig, IGEP, D-38106 Braunschweig, Germany

[4] IAS, F-91405 Orsay, France

[5] CNES, F-31400 Toulouse, France

[6] Magellium, F-31521 Ramonville St Agne, France

来源：

ICARUS | 2017年 / 285卷

关键词：

Comet; 67P/Churyumov-Gerasimenko; Comets; nucleus; Image processing; Photometry; EVOLUTION; SURFACE;

D O I：

10.1016/j.icarus.2016.12.009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

After coming to rest on the night side of comet 67P/Churyumov-Gerasimenko, the ROLIS camera on-board Rosetta's Philae lander acquired five images of the surface below the lander, four of which were with the aid of LED illumination of different colors. The images confirm that Philae was perched on a sloped surface. A local horizon is visible in one corner of the image, beyond which we can see the coma. Having spent a full day on the surface Philae was commanded to lift and rotate, after which a final, sixth, LED image was acquired. The change in perspective allowed us to construct a shape model of the surface. The distance to the foreground was about 80 cm, much larger than the nominal 30 cm. This caused stray light, rather than directly reflected LED light, to dominate the image signal, complicating the analysis. The images show a lumpy surface with a roughness of apparently fractal nature. Its appearance is completely different from that of the first landing site, which was characterized by centimeter to meter-sized debris (Mottola et al., 2015). We recognize neither particles nor pores at the image resolution of 0.8 mm per pixel and large color variations are absent. The surface has a bi-modal brightness distribution that can be interpreted in terms of the degree of consolidation, a hypothesis that we support with experimental evidence. We propose the surface below the lander to consist of smooth, cracked plates with unconsolidated edges, similar to terrain seen in CIVA images. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：263 / 274

页数：12

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