This is the assigned codes for each source of data (note: not all used)
| Source Code | Source | Description |
|---|---|---|
| 0 | Human | Manual |
| 1 | GSC1 | DSS1 plates |
| 2 | GSC2 | DSS2 plates |
| 3 | SkyMap | NASA Sky2000 catalog |
| 4 | USNO-B | USNO DSS2 plates |
| 5 | UCAC | USNO CCD Astrograph catalog |
| 6 | URAT | USNO Robotic Astrometric Telescope catalog |
| 7 | PPMXL | Heidelberg re-reduction of USNOB/2MASS |
| 8 | IRAS | NASA Infrared Astronomical Satellite |
| 9 | 2MASS | Two Micron All Sky Survey |
| 10 | WISE | Wide-Field Infrared Survey Explorer |
| 11 | GALEX | Galaxy Evolution Explorer |
| 12 | ATLASrefcat2 | Asteroid Terrestrial-impact Last Alert System Reference Catalog |
| 13 | HIPPARCOS | ESA Mission |
| 14 | TYCHO | Astrometric Catalog using Star-mappers on Hipparcos mission |
| 15 | GAIA | ESA Mission |
| 16 | PS1 | Panoramic Survey Telescope and Rapid Response System (PanSTARRS) |
| 17 | SDSS | Sloan Digital Sky Survey |
| 18 | SMSS | SkyMapper Southern Survey |
| 19 | APASS | AAVSO Photometric All-Sky Survey |
| 20 | VISTA | Visible and Infrared Survey Telescope for Astronomy (ESO) |
| 21 | VISTA-VHS | Vista Hemisphere Survey |
| 22 | VISTA-UltraVISTA | VISTA deep imaging survey |
| 23 | VISTA-VIKING | VISTA Kilo-Degree Infrared Galaxy Survey |
| 24 | VISTA-VMC | VISTA Magellanic Survey |
| 25 | VISTA-VVV | VISTA Variables in the Via Lactea |
| 26 | VISTA-VIDEO | VISTA Deep Extragalactic Observations Survey |
| 27 | ||
| 28 | NSC | NOIRLab Source Catalog |
| 29 | ||
| 30 | VST | VLT Survey Telescope (ESO) |
| 31 | VST-ATLAS | VST deep survey |
| 32 | VST-KIDS | The Kilo-Degree Survey |
| 33 | VST-VPAS | The VST Photometric H-alpha Survey of the Southern Galactic Plane |
