Multivariate statistical analysis of OSIRIS/Rosetta spectrophotometric data of comet 67P/Churyumov-Gerasimenko

被引：13

作者：

Perna, D. ^{[1
]}

Fulchignoni, M. ^{[1
]}

Barucci, M. A. ^{[1
]}

Fornasier, S. ^{[1
]}

Feller, C. ^{[1
]}

Deshapriya, J. D. P. ^{[1
]}

Hasselmann, P. H. ^{[1
]}

Sierks, H. ^{[2
]}

Barbieri, C. ^{[3
]}

Lamy, P. L. ^{[4
,5
]}

Rodrigo, R. ^{[6
,7
]}

Koschny, D. ^{[8
]}

Rickman, H. ^{[9
,10
]}

A'Hearn, M. ^{[11
]}

Bertaux, J. -L. ^{[12
]}

Bertini, I. ^{[3
]}

Cremonese, G. ^{[13
]}

Da Deppo, V. ^{[14
]}

Davidsson, B. ^{[15
]}

Debei, S. ^{[16
]}

Deller, J. ^{[2
]}

De Cecco, M. ^{[17
]}

El-Maarry, M. R. ^{[18
]}

Fulle, M. ^{[19
]}

Groussin, O. ^{[20
]}

Gutierrez, P. J. ^{[21
]}

Guttler, C. ^{[2
]}

Hofmann, M. ^{[2
]}

Hviid, S. F. ^{[22
]}

Ip, W. -H. ^{[23
,24
]}

Jorda, L. ^{[20
]}

Keller, H. U. ^{[22
,25
]}

Knollenberg, J. ^{[22
]}

Kramm, R. ^{[2
]}

Kuhrt, E. ^{[22
]}

Kuppers, M. ^{[26
]}

Lara, L. M. ^{[21
]}

Lazzarin, M. ^{[3
]}

Lopez Moreno, J. J. ^{[21
]}

Marzari, F. ^{[3
]}

Naletto, G. ^{[14
,18
,27
,28
]}

Oklay, N. ^{[2
]}

Thomas, N. ^{[18
]}

Tubiana, C. ^{[2
]}

Vincent, J. -B.

机构：

[1] UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France

[2] Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[3] Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

[4] Univ Aix Marseille, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France

[5] CNRS, Lab Astrophys Marseille, UMR 7326, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France

[6] Ctr Astrobiol INTACSIC, Madrid 28850, Spain

[7] Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland

[8] European Space Technol Ctr, ESA, Sci Support Off, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk, ZH, Netherlands

[9] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[10] PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland

[11] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[12] CNRS, LATMOS, UVSQ, IPSL, 11 Blvd Alembert, F-78280 Guyancourt, France

[13] Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy

[14] CNR, IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy

[15] Jet Prop Lab, M-S 183-301,4800 Oak Grove Dr, Pasadena, CA 91109 USA

[16] Univ Padua, Dept Mech Engn, Via Venezia 1, I-35131 Padua, Italy

[17] Univ Trent, Via Mesiano 77, I-38100 Trento, Italy

[18] Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland

[19] Osserv Astron Trieste, INAF, Via Tiepolo 11, I-34014 Trieste, Italy

[20] Aix Marseille Univ, CNRS, LAM, UMR 7326, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France

[21] CSIC, Inst Astrofis Andalucia, C Glorieta Astron S-N, E-18008 Granada, Spain

[22] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, Rutherfordstrafle 2, D-12489 Berlin, Germany

[23] Natl Cent Univ, Grad Inst Astron, 300 Chung Da Rd, Chungli 32054, Taiwan

[24] Macau Univ Sci & Technol, Space Sci Inst, Macau, Peoples R China

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

[26] ESA, European Space Astron Centre, Operat Dept, POB 78, Madrid 28691, Spain

[27] Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy

[28] Univ Padua, Ctr Studies & Activ Space CISAS G Colombo, Via Venezia 15, I-35131 Padua, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 600卷

关键词：

comets: individual: 67P/Churyumov-Gerasimenko; methods: data analysis; techniques: photometric; OSIRIS; NUCLEUS; VIRTIS; SHAPE;

D O I：

10.1051/0004-6361/201630015

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The ESA Rosetta mission explored comet 67P/Churyumov-Gerasimenko in 2014 2016, following its target before and after the perihelion passage on 13 August 2015. The NAC camera of the OSIRIS imaging system allowed to map the nucleus surface acquiring images with different filters in the visible wavelength range. Aims. Here we study the spectrophotometric behaviour of the nucleus by a multivariate statistical analysis, aiming to distinguish homogeneous groups and to constrain the bulk composition. Methods. We applied the G-mode clustering algorithm to 16 OSIRIS data cubes acquired on 5 6 August 2014 (mostly covering the northern hemisphere) and 2 May 2015 (mostly covering the southern hemisphere), selected to have complete coverage of the comet's surface with similar observing conditions. Results. We found four similar homogeneous groups for each of the analysed cubes. The first group corresponds to the average spectrophotometric behaviour of the nucleus. The second (spectrally redder) and the third (spectrally bluer) groups are found in regions that were already found to deviate from the average terrain of the comet by previous studies. A fourth group (characterised by enhancements of the flux at 700 750 nm and 989 nm, possibly due to H2O+ and /or NH2 emissions) seems connected with the cometary activity rather than with the bulk composition. Conclusions. While our aim in this work was to study the spectrophotometric behaviour of the nucleus of 67P/Churyumov-Gerasimenko as a whole, we found that a follow-up application of the G-mode to smaller regions of the surface could be useful in particular to identify and study the temporal evolution of ice patches, as well as to constrain the composition and physical processes behind the emission of dust jets.

引用

页数：9

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