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Table 8
Isotopic ratios.
| Ratio | Molecule | Value in 46P | Other comets (a) | in 67P (b) | on Earth |
|---|---|---|---|---|---|
| 12C/13C | HCN | >66 | 88–114 | 89.4 | |
| 14N/15N | HCN | >84 | 139–205 | 272 | |
| 32S/34S | H2S | 20.6 ± 2.9 | 16–23 | 23.3 | 22.7 |
| 32S/33S | H2S | >21 | – | 151 | 126.9 |
| D/H | HCN | <0.02 | 0.0023 | ||
| H2S | <0.029 | <0.008–<0.017 | 0.0012 | ||
| H2O | <8.8 × 10−4 (c) | ||||
| H2O | 1.6 ± 0.6 × 10−4 (d) | 1.4–6.5 × 10−4 | 5.3 × 10−4 | 1.56 × 10−4 |
Notes. (a) Bockelée-Morvan et al. (2015); Biver et al. (2016); Cordiner et al. (2019). (b) Altwegg (2018). (c) This paper, IRAM 30-m upper limit. (d)From SOFIA observations (Lis et al. 2019).
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