2021 NY $_1$和2022 AB两个超快旋转近地小行星的观测
Observations of two super fast rotator NEAs: 2021 NY$_1$ and 2022 AB
摘要：
自2018年以来，在加那利群岛天文台使用多台望远镜的可见近地天体观测调查（ViNOS）框架内，我们观测到了两个超快速旋转近地天体，2021 NY $_1$和2022 AB。获得了2022 AB的可见光谱和两种目标的光度学和分光光度学结果。2021 NY $_1$的光变曲线在9月20日至21日期间的4个不同夜晚获得。2021年10月30日和16日返回旋转周期$P=13.3449\pm0.0013$分钟和光变曲线振幅$A = 1.00$。我们发现，2021年纽约$_1$是一个非常细长的超快旋转器，轴比为$a/b \ge 3.6$。我们还报告了$(g-r) = 0.664 \pm 0.013$、$(r-i) = 0.186 \pm 0.013$和$(i-z_s) = -0.117 \pm 0.012$的颜色。这些颜色与S-型小行星相一致。2021年1月5日和1月8日获得的2022 AB的光变曲线显示旋转周期为$P=3.0304\pm0.0008$分钟，振幅为$A = 0.52$和$A =0.54$。2022 AB也是一个轴比为$a/b \ge 1.6$的细长物体。获得的颜色为$(g-r) = 0.400 \pm 0.017$、$(r-i) = 0.133 \pm 0.017$和$(i-z_s) = 0.093 \pm 0.016$。这些颜色类似于X型，但具有异常高的$(g-r)$值。2022年1月12日和1月14日获得的光谱与报告的颜色一致。2022 AB的0.4 - 0.6 $μm $区域的光谱向上翻转与任何已知的小行星分类或陨石光谱都不相符，证实了它不寻常的表面特性。
英文摘要：
In the framework of the Visible NEAs Observations Survey (ViNOS) that uses several telescopes at the Canary Islands observatories since 2018, we observed two super fast rotator NEAs, 2021 NY$_1$ and 2022 AB. We obtained photometry and spectrophotometry of both targets and visible spectroscopy of 2022 AB. Light curves of 2021 NY$_1$ obtained in 4 different nights between Sept. 30 and Oct. 16, 2021 return a rotation period $P=13.3449\pm0.0013$ minutes and a light curve amplitude $A = 1.00$ mag. We found that 2021 NY$_1$ is a very elongated super fast rotator with an axis ratio $a/b \ge 3.6$. We also report colours $(g-r) = 0.664 \pm 0.013$, $(r-i) = 0.186 \pm 0.013$, and $(i-z_s) = -0.117 \pm 0.012$ mag. These are compatible with an S-type asteroid. The light curves of 2022 AB obtained on Jan. 5 and Jan. 8, 2021 show a rotation period $P=3.0304\pm0.0008$ minutes, with amplitudes $A = 0.52$ and $A =0.54$ mag. 2022 AB is also an elongated object with axis ratio $a/b \ge 1.6$. The obtained colours are $(g-r) = 0.400 \pm 0.017$, $(r-i) = 0.133 \pm 0.017$, and $(i-z_s) = 0.093 \pm 0.016$. These colours are similar to those of the X-types, but with an unusually high $(g-r)$ value. Spectra obtained on Jan. 12 and Jan. 14, 2022, are consistent with the reported colours. The spectral upturn over the 0.4 - 0.6 $μm $ region of 2022 AB does not fit with any known asteroid taxonomical class or meteorite spectrum, confirming its unusual surface properties.
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