Open Access
Table 2
Rotational and inferred gas temperatures.
| UT date | Molecule | Freq. | Lines(a) | Trot | Tgas |
|---|---|---|---|---|---|
| (mm/dd.d) | (GHz) | (K) | (K) | ||
| 21P/Giacobini-Zinner (1998) | |||||
| 10/31.3 | CH3OH | 338 | 4 | 19 ± 9 | >45 |
| 11/14.3 | CH3OH | 305 | 2 |  |
>45 |
| 11/11–15 | HCN | 89–266 | 2 | 16.4 ± 2.1 | 30–40(b) |
| 21P/Giacobini-Zinner (2018) | |||||
| 09/14–18 | CH3CN | 147 | 3 | 33 ± 28 | 33 ± 28 |
| 09/14–18 | CH3OH | 145 | 10 | 41 ± 9 | >32 |
| 09/14–18 | CH3OH | 165 | 9 | 38 ± 7 | 39 ± 7 |
| 41P/Tuttle-Giacobini-Kresák (2017) | |||||
| 04/26.1 | CH3OH | 242 | 11 |  |
>40 |
| 04/27.4 | CH3OH | 252 | 7 × 2 | 28 ± 7 | 22–38 |
| 05/01.1 | CH3OH | 165 | 6 |  |
>15 |
| 64P/Swift-Gehrels (2018) | |||||
| 12/11.7 | CH3OH | 252 | 5 × 2 | 47 ± 35 | 33–100 |
| 12/17.9 | CH3OH | 242 | 9 | 18 ± 5 | Any |
Notes. (a)Number of lines used for the determination of Trot. (b)For an electron density factor xne = 0.2 (Zakharov et al. 2007).
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