Decimetre-scaled spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from OSIRIS observations

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题名:	Decimetre-scaled spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from OSIRIS observations
作者:	葉永烜;Feller, C.;Fornasier, S.;Hasselmann, P. H.;Barucci, A.;Preusker, F.;Scholten, F.;Jorda, L.;Pommerol, A.;Jost, B.;Poch, O.;ElMaary, M. R.;Thomas, N.;Belskaya, I.;Pajola, M.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Koschny, D.;Rickman, H.;Rodrigo, R.;Agarwal, J.;A’Hearn, M.;Bertaux, J.-L.;Bertini, I.;Boudreault, S.;Cremonese, G.;Da Deppo, V.;Davidsson, B. J. R.;Debei, S.;De Cecco, M.;Deller, J.;Fulle, M.;Giquel, A.;Groussin, O.;Gutierrez, P. J.;Güttler, C.;Hofmann, M.;Hviid, S. F.;Keller, H.;Ip, W.-H.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;Lara, M. L.;Lazzarin, M.;Leyrat, C.;Lopez Moreno, J. J.;Marzari, F.;Masoumzadeh, N.;Mottola, S.;Naletto, G.;Perna, D.;Oklay, N.;Shi, X.;Tubiana, C.;Vincent, J.-B.
贡献者:	理學院天文研究所
关键词:	Astrophysics;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;methods: data analysis;Sciences of the Universe;Solar and Stellar Astrophysics;space vehicles;space vehicles: instruments;techniques: image processing;techniques: photometric
日期:	2016-11-01
上传时间:	2026-04-21 14:58:21 (UTC+8)
出版者:	Oxford University Press;Oxford University Press (OUP)
摘要:	摘要： We present the results of the photometric and spectrophotometric properties of the 67P/Churyumov–Gerasimenko nucleus derived with the Optical, Spectroscopic and Infrared Remote Imaging System instrument during the closest fly-by over the comet, which took place on 2015 February 14 at a distance of ∼6 km from the surface. Several images covering the 0°–33° phase angle range were acquired, and the spatial resolution achieved was 11 cm pixel−1. The flown-by region is located on the big lobe of the comet, near the borders of the Ash, Apis and Imhotep regions. Our analysis shows that this region features local heterogeneities at the decimetre scale. We observed difference of reflectance up to 40 per cent between bright spots and sombre regions, and spectral slope variations up to 50 per cent. The spectral reddening effect observed globally on the comet surface by Fornasier et al. (2015) is also observed locally on this region, but with a less steep behaviour. We note that numerous metre-sized boulders, which exhibit a smaller opposition effect, also appear spectrally redder than their surroundings. In this region, we found no evidence linking observed bright spots to exposed water-ice-rich material. We fitted our data set using the Hapke 2008 photometric model. The region overflown is globally as dark as the whole nucleus (geometric albedo of 6.8 per cent) and it has a high porosity value in the uppermost layers (86 per cent). These results of the photometric analysis at a decimetre scale indicate that the photometric properties of the flown-by region are similar to those previously found for the whole nucleus. 出版者： Oxford University Press (OUP) 出版日期： 2016-11-01 出處： Monthly Notices of the Royal Astronomical Society, 2016-11, Vol.462 (Suppl 1), p.S287-303 資源來源： Alma/SFX Local Collection 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-2966 識別號： ISSN: 1365-8711 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stw2511
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