非主轴转子（5247）Krylov的形状模型和自旋态
Shape model and spin state of non-principal axis rotator (5247) Krylov
摘要：
上下文对非主轴（NPA）旋转体的研究可以为小行星自旋态的演化提供重要线索。然而，到目前为止，很少有研究集中在NPA旋转的主带小行星（MBA）上。其中一个已知处于激发旋转状态的MBA是小行星（5247）Krylov。目的。利用盘积分测光数据，我们建立了（5247）Krylov的物理模型，包括形状和自旋态。方法.我们应用光变曲线凸反演方法，采用2006年，2016年和2017年三次出现的地面望远镜获得的光学光变曲线，以及2010年宽视场红外巡天探测器（WISE）卫星获得的红外线曲线。结果小行星（5247）~Krylov以短轴模式（SAM）自转，其自转周期和岁差周期分别为368.7小时和67.27小时。Krylov的角动量矢量取向为$λ_{L} = 298^\circ$和$β_{L} = -58^\circ$。转动动能与基本自旋态能量$E/E_{0} \simeq 1.02$的比值表明，（5247）Krylov态约为主轴（PA）激发态态的2%。（5247）Krylov的形状可以近似为一个细长的长椭球，其转动惯量比为$I_{a}:I_{b}:I_{c}=0.36:0.96:1$。这是MBA中第一个NPA转子的物理模型。导致目前NPA旋转的物理过程无法明确重建。
英文摘要：
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.
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