Simultaneous Multicolor Photometry of the DESTINY$^{+}$ target asteroid (3200) Phaethon
| Autor: | Beniyama, Jin, Sekiguchi, Tomohiko, Kuroda, Daisuke, Arai, Tomoko, Ishibashi, Ko, Ishiguro, Masateru, Yoshida, Fumi, Senshu, Hiroaki, Ootsubo, Takafumi, Sako, Shigeyuki, Ohsawa, Ryou, Takita, Satoshi, Geem, Jooyeon, Bach, Yoonsoo P. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/pasj/psac109 |
| Popis: | Accurate estimation of brightness of (3200) Phaethon up to lower phase angles are essential for planning of the on-board camera of the DESTINY$^{+}$ mission. We have carried out intensive observations of Phaethon in the optical wavelength ($g$, $r$, and $i$) with the TriCCS camera on the Seimei 3.8 m telescope in October and November, 2021. We derived the absolute magnitude $H_\mathrm{V}$ and the slope parameter $G$ of Phaethon as $H_\mathrm{V}=14.23\pm0.02$ and $G=0.040\pm0.008$ from multiple photometric observations including lower phase angles down to $\sim$9$^{\circ}$ with the $H$-$G$ model. Using the $H_\mathrm{V}$ value and the geometric albedo of Phaethon derived in previous polarimetric studies, we estimated that the Phaethon's diameter is within a range of 5.22 to 6.74 km, which is consistent with radar and occultation observations. With the linear model, we derived $H_\mathrm{V}=14.65\pm0.02$, which corresponds to a diameter range of 4.30 to 5.56 km. Our simultaneous tricolor lightcurves of Phaethon indicate that no rotational spectral variations larger than 0.018 and 0.020 mag in the g-r and r-i colors, possibly related to inhomogeneity of the surface material and/or structure, are seen at the 2021 apparition. Comment: Accepted for publication in PASJ, comments are welcome |
| Databáze: | arXiv |
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