论文标题
2020 AV2的物理表征，这是第一个已知的小行星在金星轨道内的轨道
Physical characterization of 2020 AV2, the first known asteroid orbiting inside Venus orbit
论文作者
论文摘要
金星内部的第一个已知小行星是2020〜 $ _ {2} $。这可能是新小体的最大成员，其囊泡小于0.718〜AU，称为Vatiras。 2020年的表面〜av $ _ {2} $通过高温，强烈的太阳风照射不断地修饰，而太阳风辐射是太阳系的最内向区域以及高能量的微晶体线的影响。对其物理特性的研究代表了近地小行星科学的极端测试案例。在这里，我们报告了2020年的光谱观测值〜av $ _ {2} $在0.5-1.5〜 $μm$波长间隔中。这些是使用北欧光学望远镜和William Herschel望远镜进行的。根据获得的光谱，我们将2020〜AV $ _ {2} $分类为SA型小行星。我们通过考虑A-type和s-complex小行星的平均反照率（$ p_v = 0.23 _ { - 0.08}^{ - 0.08}^{+0.11} $ 16，我们的玛格0（$ pmair）（$ pmair），我们将此Vatira的直径估计为$ 1.50 _ { - 0.65}^{+1.10} $ km。大约1〜 $μm$的宽光谱带显示了富含橄榄石成分的签名。估计的带中心$ bic = 1.08 \ pm 0.02〜μm $ $对应于类似于黄铁矿陨石的Ferroan橄榄石矿物学。
The first known asteroid with the orbit inside that of Venus is 2020~AV$_{2}$. This may be the largest member of a new population of small bodies with the aphelion smaller than 0.718~au, called Vatiras. The surface of 2020~AV$_{2}$ is being constantly modified by the high temperature, by the strong solar wind irradiation that characterizes the innermost region of the Solar system, and by high-energy micrometeorite impacts. The study of its physical properties represents an extreme test-case for the science of near-Earth asteroids. Here, we report spectroscopic observations of 2020~AV$_{2}$ in the 0.5-1.5~$μm$ wavelength interval. These were performed with the Nordic Optical Telescope and the William Herschel Telescope. Based on the obtained spectra, we classify 2020~AV$_{2}$ as a Sa-type asteroid. We estimate the diameter of this Vatira to be $1.50_{-0.65}^{+1.10}$ km by considering the average albedo of A-type and S-complex asteroids ($p_V=0.23_{-0.08}^{+0.11}$), and the absolute magnitude (H=$16.40\pm0.78$ mag). The wide spectral band around 1~$μm$ shows the signature of an olivine rich composition. The estimated band centre $BIC = 1.08 \pm 0.02~μm$ corresponds to a ferroan olivine mineralogy similar to that of brachinite meteorites.
