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Experimental CCD Positional Observations of the Five Major Uranian Satellites

Wang, N.; Peng, Q. Y.; Xie, H. J. +1 more

Two hundred and forty-eight CCD frames, observed by using 1 m telescope at Yunnan Observatories for four consecutive nights, have been reduced to derive the precise positions of the five Uranian major satellites (Ariel, Umbriel, Titania, Oberon, and Miranda). The positions of satellites are measured with respect to the stars in Gaia DR1 (Data Rele…

DBSCAN Clustering Algorithm for Detection of Nearby Open Clusters Based on Gaia-DR2

Wang, C.; Xu, S. K.; Zhuang, L. H. +1 more

In this paper, we attempt to use the DBSCAN (Density-Based Spatial Clustering of Applications with Noise) clustering algorithm to detect nearby open clusters based on Gaia Data Release 2 (Gaia-DR2). We select 594284 stars (within a distance of 100 pc to the sun) from the Gaia-DR2 catalog, and construct a five dimensional phase space (three dimensi…