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Table 2
Fraction of objects with a given number of nearby sources that was used to evaluate the local surface density together with the radius within which the nearby sources are found (see Sect. 2.2).
| Catalogue | Radiusmax | % sources | % sources | % sources | % sources | % sources |
|---|---|---|---|---|---|---|
| (arcsec) | Nstars < 10 | 10 ≤ Nstars < 30 | 30 ≤ Nstars < 50 | 50 ≤ Nstars < 100 | Nstars = 100 | |
| Gaia DR2 | 300 | 0.000001 | 0.0002 | 0.11 | 7.24 | 92.65 |
| Pan-STARRS1 DR1 | 120 | 0.0004 | 0.0326 | 0.21 | 30.58 | 69.18 |
| GSC 2.3 | 480 | 0.0001 | 0.000007 | 0.0003 | 0.22 | 99.78 |
| PPMXL | 480 | 0.000001 | 0.000006 | 0.000026 | 0.51 | 99.48 |
| SDSS DR9 | 600 | 0.000006 | 0.00004 | 0.00005 | 0.006 | 99.99 |
| URAT-1 | 480 | 0.001 | 0.05 | 0.156 | 13.31 | 86.48 |
| 2MASS PSC | 600 | 0 | 0 | 0.007 | 2.52 | 97.48 |
| allWISE | 480 | 0 | 0 | 0.000008 | 0.0068 | 99.99 |
| APASS DR9 | 600 | 0.0061 | 1.52 | 6.27 | 28.81 | 63.40 |
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