Table 9
Brightening/fading slope change statistics.
| Δk1 Statistic | New | Intermediate | Old | All comets |
|---|---|---|---|---|
| N | 44 | 33 | 15 | 92 |
| >0 | 18 | 17 | 7 | 42 |
| <0 | 26 | 16 | 8 | 50 |
| Minimum | −17.0 | −17.6 | −11.6 | −17.6 |
| 25% | −3.0 | −2.7 | −5.7 | −3.3 |
| Median | −0.7 | 0.6 | −0.5 | −0.6 |
| 75% | 1.6 | 2.2 | 1.4 | 2.0 |
| Maximum | 63.5 | 13.3 | 3.6 | 63.5 |
| SPEARMAN r | −0.57 | −0.57 | −0.46 | −0.57 |
Notes. Statistics of Δk1, which measures change in k1 between pre- and post-perihelion orbit. Columns show results per Oort group and for all comets. Rows indicate sample size, number of comets with positive and negative Δk1, minimum, quartiles and maximum of Δk1 distributions, and Spearmank rank coefficient of the correlation between Δk1 and k1 pre-perihelion (see Figure 10.)
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