Gaia Data Release 2
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Table 8

External catalogues cross-match results: number of objects compared with the number of matched sources, the fraction of distinct matched Gaia sources and the fraction of distinct matched external catalogue sources.

Catalogue Number of Number of best % of Gaia % of External cat Number of
sources matchesa sources matcheda sources matcheda neighbours
Pan-STARRS1 DR1 2 264 263 282 810 359 898 80.49b 35.68 816 314 072
GSC 2.3 945 592 683 870 899 123 51.44 80.96 884 748 168
PPMXL 910 468 688 716 220 357 42.31 73.50 757 738 601
SDSS DR9 469 029 929 113 718 207 64.46b 24.22 114 011 744
URAT-1 228 276 482 188 071 510 27.32b 82.32 188 071 646
2MASS 470 992 970 450 688 227 26.62 92.91 451 193 296
allWISE 747 634 026 300 207 917 17.73 39.83 300 209 602
APASS DR9 61 176 401 75 018 791 4.43 90.66 81 278 312

Catalogue Number of Number of best % of Gaia % of External cat Number of
sources matchesc sources matchedc sources matchedc neighbours

HIPPARCOS2 117 955 83 034 0.005 70.39 83 283
Tycho-2 2 539 913 2 475 900 0.15 97.47 2 482 025
RAVE 5 457 555d 450 587 0.027 98.48 474 824

Notes. The number of sources in the neighbourhood tables is also listed. (a) Column “Number of best matches" includes the mates. This column and column “% of Gaia sources matched” indicate distinct matched Gaia sources. Column “% of External cat sources matched” indicates the fraction of distinct external catalogue sources that were matched. (b) The percentage of matched Gaia sources in this case takes into account the limited sky coverage of the external catalogue (see Fig. 3). (c) Column “Number of Best matches” does not include the mates, since for sparse catalogues a one-to-one best match is forced. Column “% of Gaia sources matched” indicates distinct Gaia sources. Column “% of External cat sources matched” indicates the fraction of distinct external catalogue sources that were matched. (d) RAVE contains multiple observation of the same source, which are identified with the same RAVEID and a different RAVE_OBS_ID. The numberreported in this table is the number of RAVE distinct sources.

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