2014A&A...565A..53O

Query : 2014A&A...565A..53O

2014A&A...565A..53O - Astronomy and Astrophysics, volume 565A53-53 (2014/5-1)

A fast version of the k-means classification algorithm for astronomical applications.

ORDOVAS-PASCUAL I. and SANCHEZ ALMEIDA J.

Abstract (from CDS):

K-means is a clustering algorithm that has been used to classify large datasets in astronomical databases. It is an unsupervised method, able to cope very different types of problems. We check whether a variant of the algorithm called single pass k-means can be used as a fast alternative to the traditional k-means. The execution time of the two algorithms are compared when classifying subsets drawn from the SDSS-DR7 catalog of galaxy spectra. Single-pass k-means turn out to be between 20% and 40% faster than k-means and provide statistically equivalent classifications. This conclusion can be scaled up to other larger databases because the execution time of both algorithms increases linearly with the number of objects. Single-pass k-means can be safely used as a fast alternative to k-means.

Abstract Copyright: ∼

Journal keyword(s): astronomical databases: miscellaneous - methods: data analysis - 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	IC 1396	OpC	21 38 51.4	+57 31 52						~	523	1

Query : 2014A&A...565A..53O

Basic data :

IC 1396 -- Open Cluster
Other object types:	`OpC (2013A&A,OCISM,...)`, `Cl* (2020A&A,C,...)`, `As* (2019AJ,[KC2019])`, `Rad (CTB,[DGW65])`, `HII (2013AJ)`
ICRS coord. (ep=J2000) :	`21 38 51.4 +57 31 52 (Optical) [ ] E 2023A&A...674A..37G`
FK4 coord. (ep=B1950 eq=1950) :	`21 37 18.3 +57 18 16 [ ]`
Gal coord. (ep=J2000) :	`099.3080 +03.7790 [ ]`
Proper motions mas/yr :	`-2.355 -4.495 [0.021 0.020 90] C` `2020A&A...633A..99C`
Radial velocity / Redshift / cz :	`V(km/s) -18.621 [0.907] / z(spectroscopic) -0.000062 [0.000003] / cz -18.62 [0.91] (Opt) B 2023A&A...674A..37G`
Parallaxes (mas):	`1.066 [0.004] C` `2020A&A...633A..99C`
Angular size (arcmin):	`146.0 146.0 0 (~) C` `2022A&A...664A..66M`

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`IC 1396`	`Cl Trumpler 37`	`OCl 222`	`[KC2019] Theia 9`
`C 2137+572`	`CTB 105`	`OCl 222.0`	`[KPR2004b] 500`
`Cl Collinder 439`	`OCISM 46`	`[DGW65] 144`	`[KPS2012] MWSC 3539`

References (523 between 1850 and 2026) (Total 523)
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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Data at NED - NASA/IPAC Extragalactic Database : IC 1396

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