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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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