DR8 Release - September 3rd 2010 (UDS added October 19th 2010, GPS added February 17th 2012)
DR9 release page
The charts linked below show the status of the UKIDSS surveys in this release.
This 8th release, like the DR7plus release, only contains one database,
UKIDSSDR8plus, which contains all the data, i.e. includes data from fields that
have incomplete waveband coverage as prescribed by a given survey. The WSA
DR8plus release contains views of the survey source tables that allow users to
easily target their queries at only those areas that have complete waveband
coverage. The names of the source table views are lasYJHKsource,
gpsJHKsource, gcsZYJHKsource and dxsJKsource.
These names reflect the required waveband coverage. They appear in the
schema browser under both the table and view
sections. The UDS being only one field that now has coverage in J, H and K does
not require a view.
A description of the data and how it is held in the archive is given in the
DR8 Release Summary
||No. of multiframes
||No. of objects in
|No. of sources in
||Y=20.2, J=19.6, H=18.8, K=18.2
||J=19.8, H=19.0, K=18.1
||Z=20.4, Y=20.1, J=19.6, H=18.8, K=18.2
||J=23.8, H=22.6, K=22.5 (5 sigma, 2 arcsec aperture
New in DR8:
Particular attention should be given to any notes detailing limitations
and known issues - see below,
known issues and
- On 17th February 2012 GPS data were included in DR8. The data have been
globally reprocessed and recalibrated to addresss the known issue of poor zero-point
determination in some regions of high extinction. The fix is described in detail under
A consequence of the reprocessing and subsequent re-application of QC is that
a small fraction of data that has appeared in earlier releeases will have been deprecated from DR8.
- On 19th October 2010 the latest UDS stack was published in DR8.
Further general information is available at the
UDS pages hosted by the University of Nottingham.
- With the UDS release came the restoration of the lasSourceXSSASource table
that had been offline since DR4
- The DXS has entirely new deep stacked images using the latest version of
the CASU software tools for image stacking and catalogue extraction. The
association of candidate intermediate stacked images for the deep stack images
is now made automatically to maximise the usage of the available data and to
provide a uniform collection of deep image fields. As such there may be slight
changes to selection of deep image fields for a given product ID. Finally, DXS
source catalogues now have the quality flag for the "source possibly close to
saturation" condition applied to them and their ancestor detections from the
deep stacked images.
WFAU, Institute for Astronomy,
Royal Observatory, Blackford Hill
Edinburgh, EH9 3HJ, UK