近地小行星162173(1999 JU 3)是两次小行星取样返回飞行任务的潜在目标,这不仅是因为它可以接近,而且也是因为它是第一颗可用于探索飞行任务的C型小行星。在2011-2012年的显灵期间,研究了该物体的光曲相关物理特性。我们的目标是确认日本宇宙航空研究开发机构的隼鸟2号任务有用的物理参数,如旋转周期,绝对星等和相位函数。我们的数据补充了以前的研究,没有涵盖低相位角。利用光学成像仪和1-2米级望远镜,我们获得了不同相位角下的光度数据。我们独立地导出了小行星的自转光变曲线和相位曲线。我们分析了162173(1999 JU 3)的光变曲线,得出了其会合自转周期为7.625 ± 0.003 h,轴比a/b = 1.12。根据2011-2012年期间的观测,还获得了绝对星等HR = 18.69 +/-0.07等,相位斜率G = -0.09 +/- 0.03。
英文摘要:
Near-Earth asteroid 162173 (1999 JU3) is a potential target of two asteroid sample return missions, not only because of its accessibility but also because of the first C-type asteroid for exploration missions. The lightcurve-related physical properties of this object were investigated during the 2011-2012 apparition. We aim to confirm the physical parameters useful for JAXA's Hayabusa 2 mission, such as rotational period, absolute magnitude, and phase function. Our data complement previous studies that did not cover low phase angles. With optical imagers and 1-2 m class telescopes, we acquired the photometric data at different phase angles. We independently derived the rotational lightcurve and the phase curve of the asteroid. We have analyzed the lightcurve of 162173 (1999 JU3), and derived a synodic rotational period of 7.625 +/- 0.003 h, the axis ratio a/b = 1.12. The absolute magnitude H_R = 18.69 +/- 0.07 mag and the phase slope of G = -0.09 +/- 0.03 were also obtained based on the observations made during the 2011-2012 apparition.
High spectral resolution observations of Uranus' near-IR thermospheric $H_2$ emission spectrum using the IGRINS spectrograph during the 2018 and 2023 apparition
The Effect of Aspect Changes on Near-Earth Asteroid Phase Curves
小行星的相位曲线通常被认为只取决于无空气微粒表面的散射特性和被研究物体的大小。在这项研究中,我们证明了额外的依赖对象的形状,旋转极的方向,和观看的几何形状的幻影的相位曲线。近地小行星(159402)1999 AP 10在2020年7月至2021年1月期间出现的相位曲线变化被证实是由于出现时的方位变化。这是通过对小行星的形状建模和模拟幻影上的相位曲线来实现的。我们提出了一系列的几何形状的小行星相位曲线的模拟,以了解这方面的影响的潜在幅度,在这种情况下,它可以开始占主导地位的相位曲线。这种对方位的依赖性可能会在从相位曲线数据导出的特性中引入显著的额外不确定性。我们提供并演示了软件代码,通过模拟和模型拟合随机生成的样本椭球形小行星模型在观察到的几何形状来估计近地小行星相位曲线的方面相关的不确定性。我们演示了如何忽略这种影响可能会导致误导性的解释的数据和低估的不确定性,在进一步的研究中,如在红外线,使用相位曲线导出的参数时,拟合的小行星的物理特性。
Photometry and physical characterization of near-Earth asteroid 2025 FA22 from one apparition
Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);School of Astronomy and Space Sciences, University of Science and Technology of China(中国科学技术大学天文与空间科学学院);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);National Research Institute of Astronomy and Geophysics (NRIAG)(国家天文与地球物理研究所)
The spin state of asteroid Apophis and a prediction of its change during the 2029 close encounter with Earth
Charles University(查理大学);Astronomical Institute of the Czech Academy of Sciences(捷克科学院天文研究所);Florida Space Institute, University of Central Florida(中佛罗里达大学佛罗里达太空研究所)
A Further Investigation of Apparent Periodicities and the Rotational State of Comet 103P/Hartley 2 from Combined Coma Morphology and Lightcurve Datasets
Opposition effect of comet 28P/Neujmin observed with Subaru Hyper Suprime-Cam
University of Occupational and Environmental Health, Japan(日本职业与环境大学);Chiba Institute of Technology(千叶工业大学);Kyoto Sangyo University(京都产业大学);National Astronomical Observatory of Japan, National Institutes of Natural Sciences(NINS)(日本国立天文台,自然科学研究机构);The Graduate University for Advanced Studies, SOKENDAI(综合研究大学院大学);Subaru Telescope, National Astronomical Observatory of Japan(昴星望远镜,日本国立天文台)