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Table 4
Statistics of different measurements provided by the MPC database for numbered and unnumbered asteroids.
| Code | Type | Number | Percentage | Timespan | |
|
|
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| C | CCD | 88 546 921 | 94.12% | 1986–2012 | |
| S/s | Space observation | 4 006 572 | 4.26% | 1994–2011 | |
| HST | 3544 | 0.00% | 1994–2010 | ||
| Spitzer | 114 | 0.00% | 2004–2004 | ||
| WISE | 4 002 914 | 4.25% | 2010–2011 | ||
| A | Observations from B1950.0 converted to J2000.0 | 647 690 | 0.69% | 1802–1999 | |
| c | Corrected without republication CCD observation | 462 065 | 0.49% | 1991–2007 | |
| P | Photographic | 352 449 | 0.37% | 1898–2012 | |
| T | Meridian or transit circle | 26 968 | 0.03% | 1984–2005 | |
| X/x | Discovery observation | 16 741 | 0.02% | 1845–2010 | |
| M | Micrometer | 12 081 | 0.01% | 1845–1954 | |
| H | Hipparcos geocentric observation | 5494 | 0.01% | 1989–1993 | |
| R | Radar observation | 2901 | 0.00% | 1968–2012 | |
| E | Occultations derived observation | 1737 | 0.00% | 1961–2012 | |
| V | Roving observer observation | 388 | 0.00% | 2000–2012 | |
| n | Mini-normal place derived from averaging observations from video frames | 105 | 0.00% | 2009–2012 | |
| e | Encoder | 16 | 0.00% | 1993–1995 | |
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