2021A&A...650A.109P

Query : 2021A&A...650A.109P

2021A&A...650A.109P - Astronomy and Astrophysics, volume 650A109-109 (2021/6-1)

pyUPMASK: an improved unsupervised clustering algorithm.

PERA M.S., PERREN G.I., MOITINHO A., NAVONE H.D. and VAZQUEZ R.A.

Abstract (from CDS):

Aims. We present pyUPMASK, an unsupervised clustering method for stellar clusters that builds upon the original UPMASK package. The general approach of this method makes it plausible to be applied to analyses that deal with binary classes of any kind as long as the fundamental hypotheses are met. The code is written entirely in Python and is made available through a public repository.
Methods. The core of the algorithm follows the method developed in UPMASK but introduces several key enhancements. These enhancements not only make pyUPMASK more general, they also improve its performance considerably.
Results. We thoroughly tested the performance of pyUPMASK on 600 synthetic clusters affected by varying degrees of contamination by field stars. To assess the performance, we employed six different statistical metrics that measure the accuracy of probabilistic classification.
Conclusions. Our results show that pyUPMASK is better performant than UPMASK for every statistical performance metric, while still managing to be many times faster.

Abstract Copyright: © ESO 2021

Journal keyword(s): open clusters and associations: general - methods: data analysis - open clusters and associations: individual: NGC 2516 - methods: statistical

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 2516	OpC	07 58 00.5	-60 46 36						~	793	0

Query : 2021A&A...650A.109P

Basic data :

NGC 2516 -- Open Cluster
Other object types:	`OpC (2013A&A,OCl)`, `Cl* (2020A&A,C,...)`, `As* (2019AJ,[KC2019])`
ICRS coord. (ep=J2000) :	`07 58 00.5 -60 46 36 (Optical) [ ] E 2023A&A...674A..37G`
FK4 coord. (ep=B1950 eq=1950) :	`07 57 10.6 -60 38 25 [ ]`
Gal coord. (ep=J2000) :	`273.8338 -15.8729 [ ]`
Proper motions mas/yr :	`-4.6579 11.1517 [0.0075 0.0075 90] B` `2018A&A...616A..10G`
Radial velocity / Redshift / cz :	`V(km/s) 23.82 [0.06] / z(spectroscopic) 0.000079 [0.000000] / cz 23.82 [0.06] (Opt) A 2022A&A...659A..85F`
Parallaxes (mas):	`2.4118 [0.0006] B` `2018A&A...616A..10G`
Angular size (arcmin):	`59.5 59.5 0 (Opt) D` `2020A&A...633A..99C`

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`NGC 2516`	`OCl 776.0`	`[KPR2004b] 175`
`C 0757-607`	`[KC2019] Theia 613`	`[KPS2012] MWSC 1393`

References (793 between 1850 and 2026) (Total 793)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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