Table information for 'usnob.platecorrs'

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Table Description: Plate corrections to USNO-B 1.0 based on a crossmatch with PPMX

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Resource Description: The USNO-B catalog is an all-sky catalog of about 1e9 objects including their proper motions, based on scans of several sky surveys conducted between 1950 and the late 1990ies.

For a list of all services and tables belonging to this table's resource, see Information on resource 'The USNO-B 1.0 Catalog'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2003AJ....125..984M (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.

To cite the table as such, we suggest the following BibTeX entry:

  title={{ICRS} Corrections by {USNO}-B1 Plate},
  author={{GAVO} Data Centre},
  howpublished={{VO} resource provided by the {GAVO} Data Center}

Table Documentation

For each plate and each survey, this table gives the mean offsets between the positions of the stars common to PPMX and USNO-B 1.0 with USNO-B magnitudes between 12.5 and 13.5. To find these, the PPMX positions were brought to the epoch of the USNO-B plate using the PPMX proper motions. Note that the infrared surveys have not been processed since we could not figure out how to map the plate data to the survey numbers given in USNO-B 1.0.


Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
survey Survey ID Survey identifier, see long docs N/A
field Field# Field number in survey N/A;obs.field
da d(alpha) Mean offset in alpha deg pos.eq.ra;arith.diff
dd d(delta) Mean offset in delta deg pos.eq.dec;arith.diff
nTotal N Number of objects in estimate N/A meta.number

Columns that are parts of indices are marked like this.


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