Gaia Data Release 2 - Cross-match with external catalogues: algorithms and results

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Volume 621 (January 2019)

A&A, 621 (2019) A144

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Gaia Data Release 2

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Table 1

Comparison of the correct best matches obtained with the broadening method using two different proper motion thresholds (and the proper motion propagation of positions method as baseline).

Catalogue	NBest matches	Proper motion	N Best matches	% Best matches	N Correct best matches	% Correct best matches
	pos prop^a method^b	threshold (mas yr⁻¹)	broad method^b	broad method^b	broad method^b	broad method^b
2MASS PSC	424 265 005	50	432 794 791	102.01	422 382 563	99.56
	424 265 005	0	408 841 264	96.36	407 427 704	96.03
GSC 2.3	727 460 368	50	731 416 596	100.54	725 395 647	99.72
	727 460 368	0	725 035 070	99.67	723 152 510	99.41

Notes. ^(a) pos prop: proper motion propagation of positions method. ^(b)We list here the number of distinct external catalogue sources that matched with a Gaia source with a five-parameter astrometric solution.

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