Table 2
Observed lines and inferred molecular production rates in comets ISON at rh = 0.61 au and Lovejoy at rh = 1.06 au.
| Molecule | Transition | ν |  dva |
Δv b | Q c | dva |
Δv b | Q c | |
| (MHz) | (K km s-1) | (km s-1) | (molecule s-1) | (K km s-1) | (km s-1) | (molecule s-1) | |||
|
|
|||||||||
| C/2012 S1 (ISON), Nov. 15.4 UT | C/2013 R1 (Lovejoy), Nov. 16.4 UT | ||||||||
|
|
|
||||||||
| HCN | J = 3–2 | 265 886.4 | 2.87(2) | 2.22(4) | 3.6 × 1026 | 2.06(2) | 1.69(4) | 6.1 × 1025 | |
| HNC | J = 3–2 | 271 981.1 | 0.57(2) | 2.21(8) | 6.4 × 1025 | 0.11(2) | 1.80(7) | 2.9 × 1024 | |
| HCO+ | J = 3–2 | 267 557.6 | 0.09(2) | 2.9(10) | – | ||||
| CH3OHd | 110–101 A+ | 250 507.0 | 0.132(8) | 1.9(2) | 4.3 × 1027 | 0.101(7) | 1.5(1) | 1.12 × 1027 | |
| PH3e | 10–00 | 266 944.5 | <0.036 | <8.8 × 1026 | <0.019 | <5.9 × 1025 | |||
Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits.
Production rates are computed using the model by Biver et al. (2006). For PH3 we proceeded similarly to NH3 in Biver et al. (2012).
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