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UKIRT Hemisphere Survey, J + K band, Data Release - UHS DR2

This second UHS data release was initially proprietary and available to those affiliated astronomers who responded to the announcement of opportunity. If you are a UK, USNOB or University of Hawaii astronomer requiring access please contact wsa-support.

Once logged in, accessing UHS data via the WSA is similar to accessing UKIDSS dat. There are two wavebands, J and K, available in UHSDR2. The main object catalogues are held in the database tables uhsDetection and uhsSource. The source table holds a band-merged subset of the attributes held in the detection catalogues and also the seaming flag, priOrSec, which can be used to generate a seamless (expunge detections in overlap regions) catalogue.

The J+K sky coverage of this release is approximately 10,500 sq degress, MOC maps of the coverage.

Quality control, similar to that carried out for UKIDSS, has been performed on the data. The J band quality control (1.4 arcsec seeing and depth of 19 magnitude) is the same as for DR1 and described in

The UKIRT Hemisphere Survey: Definition and Full J-band Data Release - link to astro-ph paper

For the K-band the seeing limit was 1.1 arcsec and a median magnitude limit of 17.6.

Detections from deprecated frames do not appear in uhsDetection or uhsSource. A decision was made to additionally make all data available. To that end uhsDetectionAll contains detections from all observed J and K observations up to 2020-09-01 and includes repeast observations and other data deprecated for quality reasons.