Sky Coverage / Statistics

Here we summarize the coverage of GSC 2 and the various surveys that have been added to it.

Original GSC 2

Original GSC 2 (2.3.3) sky coverage. Scale is logarithmic with log10(sources/square) degree.

GSC 2.4.1

GSC 2.4.1 coverage with original GSC233 in grey and additional catalogs overlaid in color: SDSS-DR13 (blue) + VHS-DR4 (green) + ATLAS-DR3 (red) + VIKING-DR2 (yellow) + 2MASS-6x (purple) + KIDS-DR3 (cyan).

Other catalogs included as part of GSC 2.4.1 are all-sky; ie, GAIA-DR1, UCAC5, 2MASS-PSC, 2MASS-XSC. Note that all UCAC5 are GAIA-DR1 sources.

GSC 2.4.1.2

GSC 2.4.1.2 includes additional catalogs improving coverage as can be seen below. For clarity we omit those included as part of GSC 2.4.1.1 (above). New catalogs include: PanSTARRS-DR1 (blue), SkyMapper DR1 (red), and GALEX AIS (green)

The current sky coverage for GSC 2.4.1.2 is below. Scale is logarithmic with log10(sources/square) degree.

Coverage as function of magnitude

These figures are generated from the a version of the GSC2 catalog which included at the time GAIA-DR1, 2MASS, and SDSS.

All Sources

NIR 12-18 mag Sources

NIR mag refers to the first magnitude present in the list J, H, Y, Z, z, Npg, i, Ks, K (lower case z, i from SDSS; Npg is photographic). This is roughly in order of proximity to J.

NIR <19 mag Sources

As above, in terms of defining what is NIR.

OPT <17.2 mag Sources

OPT mag refers to the first magnitude present in the list G, r, V, g, R, Fpg, Epg, Jpg (lower case r, g from SDSS; Fpg, Epg, Jpg are photographic bands)