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Table 7
Typical scale lengths affected by screening.
| Comet | ⟨ rh ⟩ | QH2O | vexp | LH2O | LOH | ⟨ rthick(Ly α) ⟩ | LHCN |
| [AU] | [1029 s-1] | [km s-1] | [km] | [km] | [km] | [km] | |
|
|
|||||||
| C/1996 B2 (Hyakutake) | 0.25 | 5 | 1.60 | 7900 | 14300 | 90 | 6600 |
| C/1995 O1 (Hale-Bopp) | 0.91 | 100 | 1.10 | 70 000 | 128 000 | 2700 | 58 000 |
| C/2002 X5 (Kudo-Fujikawa) | 0.21 | 35 | 1.25 | 3600 | 7200 | 820 | 2900 |
| C/2002 V1 (NEAT) | 0.12 | 20 | 2.00 | 2000 | 3800 | 300 | 1600 |
| C/2006 P1 (McNaught) | 0.23 | 300 | 1.50 | 8100 | 14 900 | 5900 | 4900 |
Notes. LH2O, LOH, LHCN: unscreened scale lengths of H2O, OH, and HCN, taking into account solar activity, expansion velocity, and heliocentric distance. ⟨ rthick(Ly α) ⟩ : mean radius of the optically thick Lyman α envelope (
).
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