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Telescopes mounted with polarizers can study the neutral points of the Earthsatmosphere, the solar corona, the surface of planets/moons of the Solar System,distant stars, galaxies and nebulae. These examples demonstrate well thatpolarimetry is a useful technique to gather astronomical information fromspatially extended phenomena. There are two enigmatic celestial objects thatcan also effectively be studied with imaging polarimetry, namely theKordylewski dust clouds (KDCs) positioned around the L4 and L5 triangularLagrangian libration points of the Earth-Moon system. Although in 1961 thePolish astronomer, Kazimierz Kordylewski had observed two bright patches nearthe L5 point with photography, many astronomers assume that these dust cloudsdo not exist, because the gravitational perturbation of the Sun, solar wind andother planets may disrupt the stabilizing effect of the L4 and L5 Lagrangepoints of the Earth and Moon. Using ground-born imaging polarimetry, we presenthere new observational evidence for the existence of the KDC around the L5point of the Earth-Moon system. Excluding artefacts induced by the telescope,cirrus clouds or condensation trails of airplanes, the only explanation remainsthe polarized scattering of sunlight on the particles collected around the L5point. By our polarimetric detection of the KDC we think it is appropriate toreconsider the pioneering photometric observation of Kordylewski. Ourpolarimetric evidence is supported by the results of simulation of dust cloudformation in the L5 point of the Earth-Moon system presented in the first partof this paper.

monthly notices of the royal astronomical society

Celestial Mechanics and Polarization Optics of the Kordylewski Dust  Cloud in the Earth-Moon Lagrange Point L5 Part II. Imaging Polarimetric  Observation: New Evidence for the Existence of Kordylewski Dust Cloud