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Table 8

Constraints on the CS photodissociation rate at 1 AU (β0CS).

 ⟨ rh ⟩  β0CS σH2O → CS Lifetime1
[AU] [s-1] [m2] at 1 AU [s]

C/2002 X5: VHM > 0
0.213 0.65 ± 0.15 × 10-5 no screening 154 000
0.213 1.1 ± 0.3 × 10-5 3 × 1022 108 100
0.213 1.25 ± 0.35 × 10-5 6 × 1022 107 500
0.213 1.4 ± 0.3 × 10-5 9 × 1022 106 900
0.213 1.6 ± 0.3 × 10-5 12 × 1022 104 300

C/2002 X5: VHM < 0
0.213 2.7 ± 0.7 × 10-5 no screening 37 000
0.213 2.3 ± 0.7 × 10-5 3 × 1022 49 400
0.213 2.2 ± 0.7 × 10-5 6 × 1022 55 300
0.213 2.1 ± 0.7 × 10-5 9 × 1022 61 000
0.213 2.0 ± 0.7 × 10-5 12 × 1022 66 600

C/2002 V1: 16.6 Jan. 2003
0.136 2.8 ± 1.0 × 10-5 no screening 36 000
0.136 3.2 ± 1.2 × 10-5 3 × 1022 40 400
0.136 3.8 ± 1.6 × 10-5 6 × 1022 40 800

C/2002 V1: 17.5 Jan. 2003
0.108 2.05 ± 0.45 × 10-5 no screening 49 000
0.108 2.45 ± 0.6 × 10-5 3 × 1022 56 400
0.108 2.95 ± 0.75 × 10-5 6 × 1022 57 700

C/2006 P1: VHM < 0
0.255 0.95 ± 0.4 × 10-5 no screening 105 000
0.255 2.05 ± 1.1 × 10-5 3 × 1022 77 000
0.255 3.2 ± 2.0 × 10-5 6 × 1022 71 000

C/2006 P1: VHM > 0
0.255 4.3 ± 2.1 × 10-5 no screening 23 000
0.255 5.1 ± 2.4 × 10-5 3 × 1022 36 000
0.255 6.4 ± 3.4 × 10-5 6 × 1022 34 000

Notes. 

(1)

Determined from the ratio of the total number of molecules in the coma divided by the production rate, scaled as 1/ to 1 AU.

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