Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A catalogue of 74 new open clusters found in Gaia Data-Release 2   Based on astrometric data from Gaia DR2, we employ an unsupervised machine
learning method to blindly search for open star clusters in the Milky Way
within the Galactic latitude range of |b| < 20 degrees. In addition to 2,080
known clusters, 74 new open cluster candidates are found. In this work, we
present the positions, apparent radii, parallaxes, proper motions and member
stars of these candidates
(https://cdsarc.u-strasbg.fr/ftp/vizier.submit//new_OC/). Meanwhile, to obtain
the physical parameters of each candidate cluster, stellar isochrones are fit
to the photometric data. The results show that the apparent radii and the
observed proper motion dispersions of these new candidates are consistent with
those of open clusters previously identified in Gaia DR2.

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The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga