Worldwide variations in artificial skyglow

Despite constituting a widespread and significant environmental change, understanding of artificial nighttime skyglow is extremely limited. Until now, published monitoring studies have been local or regional in scope, and typically of short duration. In this first major international compilation of monitoring data we answer several key questions about skyglow properties. Skyglow is observed to vary over four orders of magnitude, a range hundreds of times larger than was the case before artificial light. Nearly all of the study sites were polluted by artificial light. A non-linear relationship is observed between the sky brightness on clear and overcast nights, with a change in behavior near the rural to urban landuse transition. Overcast skies ranged from a third darker to almost 18 times brighter than clear. Clear sky radiances estimated by the World Atlas of Artificial Night Sky Brightness were found to be overestimated by ~25%; our dataset will play an important role in the calibration and ground truthing of future skyglow models. Most of the brightly lit sites darkened as the night progressed, typically by ~5% per hour. The great variation in skyglow radiance observed from site-to-site and with changing meteorological conditions underlines the need for a long-term international monitoring program

CasA, CygA, TauA, VirA 30MHz & 77MHz models

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Cassiopeia A, Cygnus A, Taurus A, and Virgo A at ultra-low radio frequencies.' (bibcode: 2020A&A...635A.150D

LOFAR Long-Baseline Calibrator Survey. II.

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Sub-arcsecond imaging with the International LOFAR Telescope. II. Completion of the LOFAR Long-Baseline Calibrator Survey.' (bibcode: 2022A&A...658A...2J

Cas A LOFAR and VLA images

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Low frequency radio absorption in Cassiopeia A.' (bibcode: 2018A&A...612A.110A

Gaia DR2. Variable stars in CMD

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Gaia Data Release 2. Variable stars in the colour-absolute magnitude diagram.' (bibcode: 2019A&A...623A.110G

46 open clusters GaiaDR2 HR diagrams

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Gaia Data Release 2: Observational Hertzsprung-Russell diagrams.' (bibcode: 2018A&A...616A..10G

Gaia DR2 sources in GC and dSph

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Gaia Data Release 2. Kinematics of globular clusters and dwarf galaxies around the Milky Way' (bibcode: 2018A&A...616A..12G