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Table 2
Observed comets with the OSO 20-m telescope.
| Comet | Observing UT date range | Int. time (h) | Rh (au) | ∆ (au) | d (km) |
|---|---|---|---|---|---|
| C/2016U1 (NEOWISE) | 2016-12-22–2017-01-10 | 14 | 0.71–0.34 | 0.75–1.07 | 5.2 × 104 |
| 45P/Honda-Mrkos-Pajdusáková | 2017-01-18–2017-02-06 | 31 | 0.65–0.90 | 0.36–0.11 | 7.0 × 103 |
| 2P/Encke | 2017-03-04–2017-03-17 | 15 | 0.37–0.38 | 0.75–0.68 | 4.1 × 104 |
| 41P/Tuttle-Giacobini-Kresák | 2017-04-04–2017-04-24 | 170 | 1.05–1.06 | 0.14–0.17 | 8.7 × 103 |
| C/2015 ER61 (PanSTARRS) | 2017-04-06–2017-05-09 | 12 | 1.19–1.04 | 1.21–1.23 | 7.1 × 104 |
| C/2017 E4 (Lovejoy) | 2017-04-07 | 8 | 0.63 | 0.67 | 3.9 × 103 |
| C/2015 V2 (Johnson) | 2017-05-18–2017-05-19 | 13 | 1.67 | 0.87 | 5.0 × 104 |
| C/2017 O1 (ASASSN1) | 2017-10-12–2017-10-15 | 30 | 1.50 | 0.73-0.72 | 4.2 × 104 |
| 96P/Machholz | 2017-10-30 | 5 | 0.16 | 1.04 | 6.0 × 104 |
| 46P/Wirtanen | 2018-12-08–2019-01-18 | 232 | 1.06–1.16 | 0.096–0.22 | 4.7 × 103 |
| C/2018 Y1 (Iwamoto) | 2019-02-04–2019-02-19 | 38 | 1.29–1.30 | 0.46–0.39 | 2.4 × 104 |
| 2I/Borisov | 2019-10-28–2019-11-18 | 89 | 2.21–2.06 | 2.66–2.18 | 1.4 × 105 |
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