Table 1
Mean relative molecular abundances of comet 46P for the perihelion 1991–2018 compared to typical and depleted comets.
| Log production rate ratio | |||||
|---|---|---|---|---|---|
| 1991 | 1997 | 2018 | Typical comets | Depleted comets | |
| (A'Hearn et al. 1995) | (Farnham & Schleicher 1998) | This work | (Schleicher 2008) | ||
| C2/CN | −0.01 | 0.10 ± 0.10 | 0.08 ± 0.04 | 0.10 ± 0.10 | −0.61 ± 0.35 |
| C3/CN | −1.05 | −1.05 ± 0.10 | −0.54± 0.08 | −0.57 ± 0.11 | −1.49 ± 0.14 |
| CN/OH | −2.52 | −2.50 ± 0.12 | −2.57 ± 0.06 | −2.55 ± 0.18 | −2.69 ± 0.14 |
| C2/OH | −2.53 | −2.36 ± 0.30 | −2.49 ± 0.06 | −2.46 ± 0.20 | −3.30 ± 0.35 |
| C3/OH | −3.57 | −3.49 ± 0.12 | −3.10 ± 0.08 | −3.12 ± 0.29 | −1.18 ± 0.28 |
| NH/OH | −2.13 | −2.36 ± 0.30 | −2.10 ± 0.06 | −2.23 ± 0.27 | −2.48 ± 0.34 |
| A(0)fρ/CN | −23.36 | −23.55 ± 0.38 | −23.05 ± 0.20 | −23.30 ± 0.32 | −22.61 ± 0.15 |
| A(0)fρ/OH | −25.88 | −25.92 ± 0.21 | −25.62 ± 0.25 | −25.82 ± 0.40 | −25.30 ± 0.29 |
Notes. The Afρ/Q values for typical and depleted comets are from A'Hearn et al. (1995). We note that the difference in C3 abundance in 2018 is due to the use of an updated dust continuum removal factor for the new C3 filter, which results in an increase of the C3 flux of about 2.1 times compared to the previous factors used in A'Hearn et al. (1995) and Schleicher et al. (1998). More details are given in Farnham et al. (2000) and Schleicher & Osip (2002).
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