Table 6
Abundances relative to CO.
| Quantity | 29P rh ~ 6 au | Comets rh ~ 1 au | Hale-Bopp(a) rh ~ 6 au |
|---|---|---|---|
| Q(H2O)/Q(CO) | 0.10 | 5–200(a,b,c) | ≤0.08(g) |
| Q(HCN)/Q(CO) | 0.001 | 0.01–0.5(a,b,c) | 0.003 |
| Q(NH3)/Q(CO) | <0.1 | 0.03–1.0(b,c,d) | – |
| Q(CO2)/Q(CO) | <0.01(e) | 0.5–5(f) | – |
Notes. Abundances derived assuming molecule release from the nucleus, a condition that is not verified at rh = 6 au from the Sun. (a)Biver et al. (2002). (b)Dello Russo et al. (2016). (c)Lippi et al. (2021), excluding values from the hyperactive comet 103P/Hartley 2. (d)DiSanti et al. (2017). (e)Ootsubo et al. (2012). (f)A'Hearn et al. (2012), excluding the atypical value of 100 measured in 103P/Hartley 2. (g)Extrapolating the Q(H2O) trend observed post-perihelion.
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