Tycho-2 best neighbour (gaiadr2.tycho2_best_neighbour)
The table has 2475900 rows, 6 columns.
Description
Tycho-2 table lists each matched external catalogue object with its best neighbour in Gaia.
Attribution
If you have used Gaia data in your research, please use the following acknowledgement:
This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
More information can be found on the credit and citation instructions page.
Columns
| Name | Type | UCD | Unit | Description |
|---|---|---|---|---|
| tycho2_oid | long | meta.id.cross |
External Catalogue source identifier |
|
| number_of_neighbours | int | meta.number |
Number of neighbours in Gaia Catalogue |
|
| source_id | long |
meta.id meta.main meta.ref |
||
| original_ext_source_id | char | |||
| angular_distance | double | |||
| gaia_astrometric_params | short |