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Is there any kind of concordance available between the sources in the Hipparcos catalog and the Gaia DR2 catalog? I.e., mapping the Gaia DR2 source_id to the Hipparcos HIP number?

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    $\begingroup$ Do you want the mapping for an individual or small list of objects or for the whole Hipparcos catalog? SIMBAD will do the former e.g. for HD209458 and look under 'Identifiers' $\endgroup$ – astrosnapper Feb 14 '20 at 15:05
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    $\begingroup$ This is probably unhelpful but the files in cdn.gea.esac.esa.int/Gaia/gdr1/tgas_source/csv (and files in similar directories) do this for GAIA DR1. Unfortunately, there is no corresponding directory for GAIA DR2: cdn.gea.esac.esa.int/Gaia/gdr2 $\endgroup$ – user21 Feb 17 '20 at 15:58
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As part of the Gaia DR2, cross-matches to several catalogues including HIP2 were included. The main reference for this is Marrese et al. (2018) "Gaia Data Release 2. Cross-match with external catalogues: algorithms and results". The resultant matches are included in the tables gaiadr2.hipparcos2_best_neighbour and gaiadr2.hipparcos2_neighbourhood available via the query facilities in the Gaia Archive.

Unfortunately the match is not particularly complete and it is not entirely clear why. From the paper:

While we expect to find Gaia counterparts for most of the Hipparcos2 sources, with the exception of the brightest ones, the cross-match results include only about two-thirds of them. This means that according to the adopted cross-match algorithm, only about two-thirds of the Hipparcos2 objects have a Gaia counterpart that is compatible within the position errors (i.e. have at least one good neighbour). Hence the Hipparcos2 cross-match results clearly show an issue that needs to be investigated.

As a result, they also provide a table of cross-matches based on a 1-arcsecond cone search, available on the Gaia DR2 known issues page. This cross-match is a lot more complete, but there are still a few objects that are present in both catalogues that are missing. Several of these are nevertheless present in SIMBAD, e.g. 85 Pegasi = HIP 171 = Gaia DR2 2853900872207150720.

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