Gaia Data Release 1 - Cross-match with external catalogues. Algorithm and results

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Table A.1

Comparison of the results of the three different XM algorithms for TGAS. The number of sources in TGAS is 2 057 050.


Catalogue	N matches	Fraction of matches		Fraction of correct matches
	algorithm 1	algorithm 2	algorithm 3	algorithm 2	algorithm 3

2MASS PSC	2 045 772	99.88	74.85	99.39	74.76
UCAC4	2 042 349	99.88	28.19	99.20	28.08
GSC 2.3^a	2 026 532	100.72^b	63.79	95.68	60.36

Notes.

^(a)

See text for a discussion about GSC 2.3.

^(b)

In the case of GSC 2.3 we find a few more matches with broadening than with proper motion propagation.

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