Table 1
Characteristics of the positional data for both comets analyzed in this paper and the original 1/a obtained using an osculating orbit determined from this data arc.
| Comet | q (au) | First obs. | Last obs. (yyyy mm dd) | T | Data arc (yr) | Range of helio-dist. (au) | No. of obs. | Model of motion | 1/aori (10−6 au−1) | Ref. | Model name |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C/2014 UN271 | 10.9 | 2010 11 15 | 2021 06 22 | 2031 01 22 | 11.6 | 34.1−20.2 | 59 | GR | 50.17 ± 0.75 | Here | i1 |
| 2021 09 19 | 11.8 | 34.1−19.9 | 114 | GR | 51.15 ± 0.56 | here | b8 | ||||
| C/2017 K2 | 1.81 | 2013 05 12 | 2018 01 23 | 2022 12 20 | 4.64 | 23.7−14.8 | 450 | GR | 48.48 ± 7.93 | KD18a | a8 |
| 2018 10 13 | 5.42 | 23.7−13.0 | 996 | GR | 35.49 ± 2.33 | KD18b | a9 | ||||
| 2020 11 13 | 7.51 | 23.7−7.81 | 3757 | GR | 33.02 ± 0.45 | Here | a6 | ||||
| 2020 11 13 | 7.51 | 23.7−7.81 | 3757 | NG | 35.97 ± 0.91 | Here | c5 | ||||
| 2021 09 18 | 8.35 | 23.7−5.31 | 6634 | GR | 42.78 ± 0.23 | Here | b5 | ||||
Notes. The first two rows regarding K2 relate to the solutions discussed in Królikowska & Dybczyński (2018a, KD18a) and Królikowska & Dybczyński (2018b, KD18b, see Addendum), respectively.
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