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J. 135, 906-924.], [Schroll, A.; Schober, H.J.; Lagerkvist, C.-I. (1981) Astron. Astrophys. 104, 296-299.], [Magnusson, P. (1986) Icarus 68, 1-39.], [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.], [Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1988) Astron. Astrophys. Suppl. Ser. 73, 395-405.], [Birch, P.V.; Taylor, R.C. (1989) Astron. Astrophys. Suppl. Ser. 81, 409-414.], [Harris, A.W.; Young, J.W.; Bowell, E.; Martin, L.J.; et al. (1989) Icarus 77, 171-186.], [Erikson, A.; Magnusson, P. (1993) Icarus 103, 62-66.], [Dotto, E.; De Angelis, G.; Di Martino, M.; Barucci, M.A.; et al. (1995) Icarus 117, 313-327.], [Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Icarus 159, 369-395.], [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.], [Viikinkoski, M.; Kaasalainen, M.; Durecy, J.; Carry, B.; et al. (2015) Astron. Astrophys. 581, L3.], [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.], [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2020) Ap. J. Supl. Ser. 247, id.26.], [Podlewska-Gaca, E.; Marciniak, A.; Ali-Lagoa, V.; Bartczak, P.; et al. (2020) Astron. Astrophys. 638, id A11.], [Behrend, R. (2021) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html], [Vernazza, P.; Ferrais, M.; Jorda, L.; Hanus, J.; et al. (2021) Astron. Astrophys 654, id. A56.], [Farfan, R.G.; de la Cuesta F.G.; Mananes, E.F.; Ribes, N.G.; et al. 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