Table 2
Averaged molecular abundances measured in C/2023 H2 using CRIRES+.
| C/2023 H2 | Median all | Ranges all | |||
|---|---|---|---|---|---|
| Molecule | QNC (1026 mol/s) | QT (1026 mol/s) | Abundances (% relative to water) | Abundances(a) (% relative to water) | Abundances(a) (% relative to water) |
| H2O | 36 ± 3 | 59 ± 7 | 100 | ||
| CH3OH | 1.03 ± 0.12 | 1.7 ± 0.2 | 2.9 ± 0.3 | 2.3 | [0.44−5.56] |
| HCN | 0.09 ± 0.03 | 0.16 ± 0.05 | 0.26 ± 0.08 | 0.14 | [0.007−0.61] |
| NH3 | <1.4 | <2.3 | <3.9 | 0.7 | [0.16−1.86] |
| H2 CO | <0.2 | <0.3 | <0.5 | 0.150 | [0.045−0.7] |
| C2H2 | <0.08 | <0.1 | <0.2 | 0.10 | [0.03−0.28] |
| C2H6 | 0.36 ± 0.02 | 0.60 ± 0.05 | 1.00 ± 0.06 | 0.59 | [0.04−2.73] |
| CH4 | 0.439 ± 0.008 | 0.77 ± 0.03 | 1.22 ± 0.02 | 0.75 | [0.11−2.73] |
| CO | 5.87 ± 0.22 | 9.7 ± 0.5 | 16.3 ± 0.6 | 2.16 | [0.43−15] |
Notes. Nucleus centred (QNC) and total production rates (QT), and abundances relative to water in C/2023 H2. Production rates were calculated for a rotational temperature of 50 ± 3 K. A common growth factor of 1.65 ± 0.07 was used for all the nights. Upper limits are given at a 3σ level (i.e. a 99% confidence level). (a) Median mixing ratios and minimum and maximum values in the comet population, retrieved considering 35 comets (Lippi et al., in prep.).
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