| Total | |
|---|---|
| Number of active observers: (total includes noncontributing observers) |
96 of 3320 |
| Number of active associations: (total includes noncontributing associations) |
13 of 18 |
| Number of active countries: (total includes noncontributing countries) |
27 of 249 |
| Number of observed comets: (total is number of comets in COBS database) |
148 of 2694 |
| Total number of observations: | 4187 |
| Visual Observations: | 3046 |
| CCD Observations: | 1141 |
| Comet type | Total | Visual | CCD |
|---|
| 2011 | Total | Visual | CCD | Obs |
|---|
| Comet | Total | Visual | CCD | Obs |
|---|
| Observer | Total | Visual | CCD | Obs |
|---|
| Association | Total | Visual | CCD | Obs |
|---|
| Country | Total | Visual | CCD | Obs |
|---|