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Table 1
Estimated bias for offset observations in both right ascension and declination for different stellar catalogues and observatories.
| Source | Catalogue | IAU code | Observatory | Estimated bias |
| bi (in mas) | ||||
|
|
||||
| MPC | – | – | all | 300 |
|
|
||||
| Offset | WFI | 809 | European South Observatory | 75 |
| 874 | Observatório do Pico dos Dias | 150 | ||
| 586 | Pic du Midi | 150 | ||
| 493 | Calar Alto | 150 | ||
| J86 | Sierra Nevada | 150 | ||
| I95 | La Hita | 150 | ||
| Z20 | Mercator La Palma | 150 | ||
| J13 | Liverpool La Palma | 150 | ||
| – | Other | 300 | ||
|
|
||||
| UCAC/other | 809 | European South Observatory | 150 | |
| 874 | Observatório do Pico dos Dias | 225 | ||
| 586 | Pic du Midi | 225 | ||
| 493 | Calar Alto | 225 | ||
| J86 | Sierra Nevada | 225 | ||
| I95 | La Hita | 225 | ||
| Z20 | Mercator La Palma | 225 | ||
| J13 | Liverpool La Palma | 225 | ||
| – | Other | 300 | ||
|
|
||||
| Occultation | – | 244 | Geocentre | 0 |
|
|
||||
| Fraser et al. (2013) | 2MASS/SDSS | 267 | CFHT | 300 |
| 568 | Gemini-Mauna Kea | 300 | ||
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