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Geem, Jooyeon; Ishiguro, Masateru; Takahashi, Jun; Akitaya, Hiroshi; Kawabata, Koji S; Nakaoka, Tatsuya; Imazawa, Ryo; Mori, Fumiki; Jin, Sunho; Bach, Yoonsoo P; Jo, Hangbin; Kuroda, Daisuke; Hasegawa, Sunao; Yoshida, Fumi; Ishibashi, Ko; Sekiguchi, Tomohiko; Beniyama, Jin; Arai, Tomoko; Ikeda, Yuji; Shinnaka, Yoshiharu; Granvik, Mikael; Siltala, Lauri; Djupvik, Anlaug A; Kasikov, Anni; Pinter, Viktoria; Knudstrup, Emil
Monthly Notices of the Royal Astronomical Society Letters, 10/2022, Letnik: 516, Številka: 1Journal Article
ABSTRACT We report on the first polarimetric study of (3200) Phaethon, the target of JAXA’s DESTINY+ mission, in the negative branch to ensure its anhydrous nature and to derive an accurate geometric albedo. We conducted observations at low phase angles (Sun-target-observer angle, α = 8.8–32.4°) from 2021 October to 2022 January and found that Phaethon has a minimum polarization degree Pmin = −1.3 ± 0.1 per cent, a polarimetric slope h = 0.22 ± 0.02 per cent deg−1, and an inversion angle α0 = 19.9 ± 0.3°. The derived geometric albedo is pV = 0.11 (in the range of 0.08–0.13). These polarimetric properties are consistent with anhydrous chondrites, contradict hydrous chondrites, and typical cometary nuclei.
