High–precision trigonometric parallaxes, proper motions, and radial velocities of the Gaia DR2 catalog allow us to investigate the problem of open clusters rotation. Such a study could naturally be started with the clusters closest to the Sun, so we chose Praesepe as an object of our study. We selected 908 probable cluster members up to the apparent magnitude G = 19 mag based on their trigonometric parallaxes and proper motions, within 10° distance from the cluster center. We estimated the cluster distance modulus to be 6.36 mag and 6.02 mag using the trigonometric parallaxes of the probable cluster members and by fitting the theoretical isochrone to the cluster hertzsprung‐russell (HR) diagram, respectively. The cluster rotation velocity was estimated to be 0.4 km s⁻¹ at the periphery of the cluster, using three different methods. In the future, we will continue the study of clusters rotation, with several nearby open clusters.

中文翻译：

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基于Gaia数据的开放星团旋转。普拉塞佩

Gaia DR2目录的高精度三角视差，适当的运动和径向速度使我们能够研究开放星团旋转的问题。这样的研究自然可以从离太阳最近的星团开始，因此我们选择Praesepe作为研究的对象。我们选择了908个可能的星团成员，这些星团成员基于它们的三角视差和适当的运动，在距星团中心10°的范围内，其视在大小G = 19 mag。我们使用可能的星团成员的三角视差并通过将理论等时线拟合到星团hertzsprung-russell（HR）图，估计星团距离模量分别为6.36 mag和6.02 mag。团簇旋转速度估计为0.4 km s ^-1在群集的外围，使用三种不同的方法。将来，我们将继续研究附近有几个开放星团的星团旋转。