First observation of the short-term change of polarization of the L4 Kordylewski dust cloud
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2026
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Abstract
Abstract The Kordylewski dust clouds (KDCs) near the L4 and L5 Lagrange points of the Earth and Moon have been discovered in 1961. Their long-term stability is disrupted by the Sun’s gravitation. Although computer modellings showed that both KDCs can exist for several years and some astronomers observed them with the naked eye or by photometry, other researchers could not detect them. Using imaging polarimetry, the polarization characteristics of both KDCs were first observed in 2017 and 2022 in Hungary. In 2023, these polarimetric observations were performed under the much better astroclimate of the Khomas Highland in Namibia when the L5 KDC was detected again polarimetrically. In 2024, we continued our Namibian KDC observations. Our measurements were performed with the same imaging polarimetric portable telescope that was used in 2023 in Namibia. The polarization patterns were evaluated with our AlgoNet software. We report here on the first polarimetric observation of the short-term dynamics of the L4 KDC. We present the 3-day change of the degree and angle of polarization of the L4 KDC being an inhomogeneous sunlight-scattering particle aggregation. We conclude that the KDCs have a complex and rapid dynamics, which we plan to explore further in our next Namibian polarimetric campaigns.
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| Authors | Judit Slíz‐Balogh, Attila Mádai, P. Sári, András Barta, Gábor Horváth |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1348
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| URL | |
| Keywords | Keywords not found |
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