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Table 4
Isotopic ratios.
| Ratio | Molecule | C/2021 A1 | C/2022 E3 (a) | Other comets (b) | Earth(c) |
|---|---|---|---|---|---|
| 12C/13C | HCN | >47 | 135 ± 75 | 88–114 | 89.4 |
| 14N/15N | HCN | 131 ± 81 | 223 ± 138 | 139–205 | 272 |
| 32S/34S | CS | 17.8 ± 5.6 | 11.2 ± 3.7 | 16–23 | 22.7 |
| H2S | >3.4 | 16.5 ± 7.3 | 16–23 | 22.7 | |
| D/H | H2O | <6.4 × 10−4 | [1.4–6.4] × 10−4 | 1.6 × 10−4 (d) | |
| HCN | <1.8% | 0.23% | |||
| H2CO | <3.1% | <0.7% | |||
| CH2DOH | <1.7% | <0.35% | |||
| CH3OD | <2.5% | <1.0% |
Notes. (a)The lines observed in C/2022 E3 are only present at the 1.5–3σ level.(b)Bockelée-Morvan et al. (2015); Biver et al. (2016); Cordiner et al. (2019). (c)Šimečková et al. (2006). (d)VSMOW value.
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