论文标题
非主要轴旋转器（5247）Krylov的形状模型和自旋状态
Shape model and spin state of non-principal axis rotator (5247) Krylov
论文作者
论文摘要
语境。非主要轴（NPA）旋转器的研究可以为小行星旋转状态的演变提供重要的线索。但是，到目前为止，很少有研究集中于NPA旋转的主要皮带小行星（MBA）。已知处于激发旋转状态的MBA之一是小行星（5247）Krylov。目标。通过使用磁盘集成的光度数据，我们构建了（5247）Krylov的物理模型，包括形状和自旋状态。方法。我们采用光曲线凸反转方法，采用了通过在2006年，2016年和2017年使用地面望远镜在三种幻影中获得的光光曲线，以及2010年宽场红外调查Explorer（Wise）卫星获得的红外光曲线在2010年在2010年获得。小行星（5247）〜Krylov以短轴模式（SAM）旋转，其特征分别为368.7小时和67.27小时。发现Krylov的角动量向量方向为$λ_{l} = 298^\ circ $和$β_{l} = -58^\ circ $。与主轴（PA）旋转状态相比，旋转动能与基本旋转状态能$ e/e_ {0} \ simeq 1.02 $的比率大约是（5247）Krylov激发态。 （5247）Krylov的形状可以通过细长的pr酸椭圆形近似，其惯性矩的比例为$ i_ {a}：i_ {b}：i_ {c} = 0.36：0.96：0.96：1 $。这是MBA中NPA旋转器的第一个物理模型。导致当前NPA旋转的物理过程不能明确地重建。
Context. The study of non-principal axis (NPA) rotators can provide important clues to the evolution of the spin state of asteroids. However, so far, very few studies have focused on NPA-rotating main-belt asteroids (MBAs). One of MBAs that are known to be in an excited rotation state is asteroid (5247) Krylov. Aims. By using disk-integrated photometric data, we construct a physical model of (5247) Krylov including shape and spin state. Methods. We apply the light curve convex inversion method employing optical light curves obtained by using ground-based telescopes in three apparitions during 2006, 2016, and 2017, along with infrared light curves obtained by the Wide-field Infrared Survey Explorer (WISE) satellite in 2010. Results. Asteroid (5247)~Krylov is spinning in a short axis mode (SAM) characterized by rotation and precession periods of 368.7 hr and 67.27 hr, respectively. The angular momentum vector orientation of Krylov is found to be $λ_{L} = 298^\circ$ and $β_{L} = -58^\circ$. The ratio of the rotational kinetic energy to the basic spin state energy $E/E_{0} \simeq 1.02$ shows that the (5247) Krylov is about 2% excited state compared to the Principal Axis (PA) rotation state. The shape of (5247) Krylov can be approximated by an elongated prolate ellipsoid with a ratio of moments of inertia of $I_{a}:I_{b}:I_{c}=0.36:0.96:1$. This is the first physical model of NPA rotator among MBAs. The physical processes that led to the current NPA rotation cannot be unambiguously reconstructed.
