We present the study of dynamical status of the globular cluster NGC 1851. A combination of multi-wavelength space and ground-based data sets are used for the present analysis. In order to select the genuine cluster members, we used the astro-photometric data available from HST and GAIA-DR2 catalogs. The BSS radial distribution of the cluster is plotted from the center of the cluster to the outskirts. The radial distribution of BSS shows a central peak, followed by a dip at the intermediate radii (\(r_\mathrm{min}\sim 90''\)) and a rising trend in the outskirts. We also estimated \(A^{+}_{rh}\) parameter as 0.391 ± 0.006 to validate the findings of the radial distribution study. On the basis of the minima in the BSS radial distribution and the value of \(A^{+}_{rh}\) parameter, we conclude that NGC 1851 belongs to Family II classification and is an intermediate dynamical state cluster.

我们介绍了球状星团 NGC 1851 的动力学状态研究。目前分析使用了多波长空间和地面数据集的组合。为了选择真正的星团成员，我们使用了 HST 和 GAIA-DR2 目录中的天文光度数据。集群的 BSS 径向分布从集群的中心到郊区绘制。BSS 的径向分布显示一个中心峰值，然后在中间半径（\(r_\mathrm{min}\sim 90''\)）处下降，并在郊区呈上升趋势。我们还估计\(A^{+}_{rh}\)参数为 0.391 ± 0.006，以验证径向分布研究的结果。基于BSS径向分布中的最小值和\(A^{+}_{rh}\)的值参数，我们得出结论，NGC 1851 属于Family II分类，是一个中间动态星团。