Table 2
Completeness of the sample of comets in the present catalogue in comparison to MWC 08 as a function of the time distribution of cometary discovery (five periods given in Col. [1]) and the perihelion distance (qosc< 3.1 au or qosc ≥ 3.1 au, Cols. [2], [3] and [4], [5], respectively).
| Number of comets in the different samples | ||||||
| Period | qosc< 3.1 au | qosc ≥ 3.1 au | All comets | |||
| of discovery | MWC 08 | Samples A1+A2 | MWC 08 | Sample B | MWC 08 | Samples A1+A2+B |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
|
|
||||||
| before 1901 | 11 | 2 | – | – | 11 | 2 |
| 1901–1950 | 26 | 0 | 6 | – | 32 | 0 |
| 1951–2000 | 25 | 16 | 42 | 34 | 67 | 50 |
| 2001–2005 | 9 | 10 | 20 | 20 | 29 | 30 |
| 2006–2010 | 12 | 19 + 3 | 6 | 15 | 18 | 34 + 3 |
|
|
||||||
| All | 83 | 47 + 3 | 74 | 69 | 157 | 116 + 3 |
Notes. The number of comets is given for objects of first-quality class orbits in MWC 08 (1A or 1B), except for the comets of Sample A2, where 3 objects with orbital quality class 2 and 3 are included; this is indicated by “+ 3” in Cols. [3] and [7]. The upper limit for 1 /aori is taken at 0.000150 au-1. All comets with an NG orbit in MWC 08 (in this case the 1 /aori is not given there) were also analysed and some of them have 1 /aori< 0.000150 au-1. The sample A1+A2 is complete in the time interval of 2006–2010; during the same period, Sample B is almost complete: four comets are still observable, one of which, C/2010 U3 Boattini, will pass perihelion in 2019!
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