VizieR Online Data Catalog: The fourth UltraVISTA data release (DR4) (Moneti+, 2019)

DR4 was built from the pre-processed UltraVISTA images from CASU ("The Cambridge Astronomy Survey Unit") observed at VISTA from 4 December, 2009 to 29 June, 2016 as available in early 2017.

We downloaded 63931 individual images. After quality control (which mainly is a rejection of images with FWHM>1.0" or ellipticity>0.1), we were left with 58138 individual images that were used to create the 5 stacks for the 5 bands: Y , J, H, Ks, and NB118. This release comprises seven complete observing seasons: however, less data were taken in season 2 (2010-2011) due to the VISTA primary mirror being re-coated during the UltraVISTA observing season.

VISTA is a 4-m class wide-field survey telescope equipped with an IR camera (VIRCAM) and located at ESO's Cerro Paranal Observatory in Chile.

Note that, unlike in previous releases, chip 16 has not been masked.

(2 data files).