论文标题
命运的同时多色光度法
Simultaneous Multicolor Photometry of the DESTINY$^{+}$ target asteroid (3200) Phaethon
论文作者
论文摘要
（3200）phaethon到较低角度的亮度的准确估计对于计划命运$^{+} $任务的板载摄像头至关重要。我们已经在2021年10月和11月的Seimei 3.8 m望远镜上使用TRICCS摄像头进行了光波长（$ g $，$ r $ $ $ $ $ $ $ $ $ $和$ i $）的Phaethon的密集观察。我们得出了绝对的幅度$ h_ \ Mathrm {v} $和slope parame $ g $ g $ g $ g $ $ H_ \ MATHRM {V} = 14.23 \ PM0.02 $和$ G = 0.040 \ PM0.008 $，来自多个光度观测值，包括$ h $ g $型号，包括较低相角，降低至$ \ sim $ 9 $^{\ sim $ 9 $^{\ circ} $。使用$ h_ \ mathrm {v} $值和先前偏光研究中衍生的phaethon的几何反照率，我们估计，Phaethon的直径在5.22至6.74 km的范围内，这与雷达和掩盖观察值一致。使用线性模型，我们得出了$ H_ \ Mathrm {V} = 14.65 \ PM0.02 $，这对应于4.30至5.56 km的直径范围。我们同时的phaethon的三色灯弯曲表明，在2021年的幻影下，G-R和R-I颜色中没有旋转光谱变化大于0.018和0.020 mag，可能与表面材料和/或结构的不均匀性有关。
Accurate estimation of brightness of (3200) Phaethon up to lower phase angles are essential for planning of the on-board camera of the DESTINY$^{+}$ 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.
