Second Data Release of the All-sky NOIRLab Source Catalog
David L. Nidever, Arjun Dey, Katie Fasbender, Stephanie Juneau, Aaron, M. Meisner, Joseph Wishart, Adam Scott, Kyle Matt, Robert Nikutta, and, Ragadeepika Pucha

TL;DR
The second data release of the NOIRLab Source Catalog provides an extensive, improved, and publicly accessible dataset of over 3.9 billion objects with enhanced photometric and astrometric precision, supporting diverse astronomical research.
Contribution
This paper introduces NSC DR2, featuring significant increases in data volume, improved calibration accuracy, and new variability indices, advancing the utility of the catalog for various scientific applications.
Findings
Contains over 3.9 billion objects with 68 billion measurements
Achieves approximately 7 mas astrometric accuracy and 1-2% photometric precision
Includes variability indices for 23 million objects
Abstract
We announce the second data release (DR2) of the NOIRLab Source Catalog (NSC), using 412,116 public images from CTIO-4m+DECam, the KPNO-4m+Mosaic3 and the Bok-2.3m+90Prime. NSC DR2 contains over 3.9 billion unique objects, 68 billion individual source measurements, covers 35,000 square degrees of the sky, has depths of 23rd magnitude in most broadband filters with 1-2% photometric precision, and astrometric accuracy of 7 mas. Approximately 1.9 billion objects within 30,000 square degrees of sky have photometry in three or more bands. There are several improvements over NSC DR1. DR2 includes 156,662 (61%) more exposures extending over 2 more years than in DR1. The southern photometric zeropoints in are more accurate by using the Skymapper DR1 and ATLAS-Ref2 catalogs, and improved extinction corrections were used for high-extinction…
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