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Table 1

Observational conditions (slit dimension, heliocentric (r), and geocentric (Δ) distances) of various comets, corresponding H2O production rates and CO2 and CO relative abundances relative to H2O, and comparison of calculated green to red-doublet emission intensity ratios (G/R ratio) with the observations.

Comet r Δ Slit dimension Q(H2O) CO2 CO G/R ratio Reference
(au) (au) () (s-1) (%) (%) cal. obs.

116P/Wild 4 2.40 1.4 8 × 1 1 × 1027 * 10 20 0.09 0.15 Furusho et al. (2006)
C/2003 K4 (LINEAR) 2.60 2.36 0.80 × 11 1 × 1029 10 25 0.09 0.09 Decock et al. (2013)
C/2007 Q3 (Siding Spring) 2.96 2.48 3.20 × 1.6 4 × 1027 * 17 10 0.12 0.20 McKay et al. (2012)
C/2006 W3 (Christensen) 3.13 2.35 3.20 × 1.6 2.0 × 1028 * 42 98 0.18 0.24 ± 0.08 McKay et al. (2012)
C/2009 P1 (Garradd) 3.25 3.50 0.44 × 12 2.3 × 1027 *** 25 100 0.14 0.21 Decock et al. (2013)
C/2001 Q4 (NEAT) 3.70 3.40 0.45 × 11 3.8 × 1027 ** 75 100 0.23 0.33 Decock et al. (2013)
Comet X§ 3.70 3.40 0.45 × 11 4 × 1027 100 100 0.25

Notes.

(‡)

assumed;

(†)

see text;

(§)

comet X is a hypothetical comet similar to the observational condition of comet NEAT, but having equal gas production rate of H2O, CO2, and CO; cal. = Calculated, obs. = Observation.

(∥)

Reference is for the observed G/R ratio value on the corresponding comet.

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