Table 4
Molecular abundances.
| Molecule | Name | Abundance relative to water in % | |||
|---|---|---|---|---|---|
| 67P in 2021 | 67P in 2015(a) | Rosetta(b) | in comets | ||
| HCN | Hydrogen cyanide | 0.09 ± 0.01 | 0.11 ± 0.02 | 0.2 | 0.08–0.25 |
| HNC | Hydrogen isocyanide | <0.006 | – | – | 0.0015–0.035 |
| HNCd | “ | < 0.009(c) | – | – | |
| CH3CN | Methyl cyanide | 0.017 ± 0.003 | <0.30 | 0.0059 | 0.008–0.054 |
| HC3N | Cyanoacetylene | <0.019 | – | 0.0004 | 0.002–0.068 |
| HNCO | Isocyanic acid | 0.045 ± 0.013 | – | 0.027 | 0.009–0.080 |
| NH2CHO | Formamide | <0.033 | – | 0.004 | 0.016–0.022 |
| CO | Carbon monoxide | <4.6 | – | 0.3–3 | 0.4–35 |
| H2CO | Formaldehyde | 0.06 ± 0.01 | <0.8 | 0.5 | |
| H2COd | “ | 0.28 ± 0.05(d) | <1.5(d) | 0.5 | 0.13- 1.4(d) |
| CH3OH | Methanol | 1.2 ± 0.1 | 2.1 ± 0.6 | 0.5–1.5 | 0.7–6.1 |
| HCOOH | Formic acid | <0.21 | – | 0.013 | 0.03–0.18 |
| CH3CHO | Acetaldehyde | <0.14 | – | 0.047 | 0.05–0.08 |
| H2S | Hydrogen sulphide | 0.16 ± 0.03 | < 2.0 | 2.0 | 0.09–1.5 |
| CS | Carbon monosulphide | 0.05 ± 0.01 | < 0.25 | 0.02(e) | 0.05–0.20 |
| OCS | Carbonyl sulphide | <0.54 | – | 0.07 | 0.05–0.40 |
| SOd | Sulphur monoxide | <0.22(f) | – | 0.071 | 0.04–0.30(f) |
| SO2 | Sulphur dioxide | <0.23 | – | 0.127 | 0.03–0.23 |
| H2CS | Thioformaldehyde | <0.1 | – | 0.0027 | 0.009–0.090 |
Notes. (a)Based on IRAM data with 
molec s−1 (Biver et al. 2019). (b)Based on Biver et al. (2019), Rubin et al. (2019), and Läuter et al. (2020).(c) Assuming a daughter distribution with Lp = 1000 km (Cordiner et al. 2014, 2017).(d) Assuming a daughter distribution with Lp = 1.2–2.0 × Ld(H2CO). (e)From CS2 with ROSINA.(f) Assuming a daughter distribution with Lp = Ld(SO2).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.