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Table 3
Abundances (with respect to water) of relevant molecules measured for the three comets where HNCO and formamide have been observed.
| Species | Abundance (% of H2O) | References | ||
| Hale-Bopp | Lemmon | Lovejoy | ||
|
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| CO | 2.3 | 4.0 | 7.2 | Bockelée-Morvan et al. (2000), Biver et al. (2014) |
| N2 | 0.013 | 0.023 | 0.041 | estimated from Rubin et al. (2015) |
| HNCO | 0.1 | 0.025 | 0.021 | Bockelée-Morvan et al. (2000), Paganini et al. (2014a) |
| NH2HCO | 0.02 | 0.06 | 0.021 | Bockelée-Morvan et al. (2000), Biver et al. (2014) |
| NH3 | 1–1.8 | ≤0.63 | ≤1.86 | Biver et al. (2014), Paganini et al. (2014a, b) |
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| HNCO/N in N2 | 3.85 | 0.55 | 0.26 | |
| NH2HCO/N in N2 | 0.77 | 1.3 | 0.26 | |
| HNCO/NH3 | 0.06–0.1 | ≥ 0.04 | ≥0.01 | |
| NH2HCO/NH3 | 0.01–0.02 | ≥ 0.01 | ≥0.01 | |
Notes. The ratios of HNCO and formamide with respect to nitrogen atoms in N2 or in NH3 are also reported.
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