Table 7
Molecular abundances.
| Molecule | Name | Abundance relative to water in % | ||
|---|---|---|---|---|
| in 46P | in comets | in 67P (a) | ||
| HCN | Hydrogen cyanide | 0.11 ± 0.01 | 0.08–0.25 | 0.20 |
| HNC | Hydrogen isocyanide | 0.0015 ± 0.0004 | 0.002–0.035 | – |
| HNC (b) | 0.004 ± 0.001 | |||
| CH3CN | Methyl cyanide | 0.017 ± 0.001 | 0.008–0.054 | 0.0059 |
| HC3N | Cyanoacetylene | <0.003 | 0.002–0.068 | 0.0004 |
| HNCO | Isocyanic acid | <0.009 | 0.009–0.080 | 0.027 |
| NH2CHO | Formamide | 0.015 ± 0.002 | 0.016–0.022 | 0.004 |
| CO | Carbon monoxide | <1.23 | 0.4–35 | 0.3–3 |
| H2COext (c) | Formaldehyde | 0.38 ± 0.02 | 0.13–1.4 | 0.5 |
| CH3OH | Methanol | 3.38 ± 0.03 | 0.7–6.1 | 0.5–1.5 |
| HCOOH | Formic acid | <0.035 | 0.03–0.18 | 0.013 |
| CH3CHO | Acetaldehyde | 0.06 ± 0.01 | 0.05–0.08 | 0.047 (d) |
| (CH2OH)2 | Ethylene glycol | 0.19 ± 0.03 | 0.07–0.35 | 0.011 |
| HCOOCH3 | Methyl formate | <0.14 | 0.06–0.08 | 0.0034 (e) |
| CH2OHCHO | Glycolaldehyde | <0.041 | 0.016–0.039 | 0.0034 (e) |
| C2H5OH | Ethanol | 0.11 ± 0.04 | 0.11–0.19 | 0.04 (f) |
| H2S | Hydrogen sulphide | 0.92 ± 0.01 | 0.09–1.5 | 2.0 |
| CS | Carbon monosulphide | 0.028 ± 0.003 | 0.05–0.20 | 0.02 (h) |
| OCS | Carbonyl sulphide | <0.07 | 0.05–0.40 | 0.07 |
| SO | Sulphur monoxide | <0.09 | 0.04–0.30 | 0.071 |
| SO2 | Sulphur dioxide | <0.03 | 0.03–0.23 | 0.127 |
| H2CS | Thioformaldehyde | ≤ 0.016 | 0.009–0.090 | 0.0027 |
| NS | Nitrogen sulphide | <0.012 | 0.006–0.012 | |
| CH3SH | Methyl mercaptan | <0.06 | <0.023 | 0.038 |
| CH2CO | Ketene | <0.034 | ≤0.0078 | |
| CH3COCH3 | Acetone | <0.04 | ≤0.011 | 0.0047 (g) |
| CH3OCH3 | Dimethyl ether | <0.13 | <0.025 | 0.04 (f) |
| c-C2H4O | Ethylene oxide | <0.029 | <0.006 | 0.047 (d) |
| CH3COOH | Acetic acid | <0.09 | <0.026 | 0.0034 (e) |
| CH3NH2 | Methylamine | <0.13 | <0.055 | |
| C2H3CN | Acrylonitrile | <0.013 | <0.0027 | |
| C2H5CN | Ethyl cyanide | <0.013 | <0.0036 | |
| PH3 | Phosphine | <0.15 | <0.07 | <0.003 |
| PN | Phosphorus nitride | <0.003 | <0.0 | <0.001 |
| PO | Phosphorus oxide | <0.013 | <0.0 | 0.011 |
| NH2 CH2 COOH | Glycine I | <0.5 | <0.18 | 0.000017 |
Notes. (a) Based on Biver & Bockelée-Morvan (2019); Rubin et al. (2019); Läuter et al. (2020). (b) Assuming a daughter distribution with Lp = 1000 km (Cordiner et al. 2014, 2017). (c) Assuming a daughter distribution. (d,e,f,g) Isomers not distinguished by ROSINA; abundance is for their sum. (h)From CS2 with ROSINA.
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