  The Reference Catalog of Spectral Energy Distributions of 800,000 galaxies
(RCSED) includes the results of uniform re-processing of 800,000 SDSS DR7
galaxies at redshifts $0.007<z<0.6$ complemented with ultraviolet-to-infrared
photometric data from GALEX, SDSS, and UKIDSS. The key difference between RCSED
and existing databases of galaxy properties (NED, HyperLeda, part of SIMBAD) is
that rather than providing a compilation of literature data, we perform
homogeneous data analysis of spectral and photometric data using our own tools
and publish derived physical properties of galaxies along with re-calibrated
spectra and photometry and their best-fitting models. Here we present the 2nd
release of our catalog, RCSEDv2 where we substantially expanded the spectral
dataset to 4 million objects by including spectral data analysis for 10 large
spectroscopic surveys (SDSS, SDSS/eBOSS, LAMOST, Hectospec, CfA redshift
surveys, 2dFGRS, 6dFGS, DEEP2/3, WiggleZ). The photometric part has also been
expanded by including DESI Legacy Survey, DES, UHS, ESO Public Surveys, and
WISE in addition to GALEX, SDSS, and UKIDSS used in the original RCSED. This
makes RCSEDv2 the largest database of galaxy properties and homogeneously
processed spectral and photometric data up-to-date and creates a foundation for
the analysis of future large-scale spectral surveys DESI and 4MOST.

Instrumentation and Methods for Astrophysics