Interferometric imaging of carbon monoxide in comet C/1995 O1 (Hale-Bopp): evidence of a strong rotating jet

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Table 2:

Model parameters.
Fixed parameters
heliocentric distance	$r_{\rm h}$	0.989 AU
geocentric distance	$\Delta$	1.368 AU
gas expansion velocity^(a)	$v_{\rm exp}$	1.05 km s^-1
total CO production rate $^{{\rm (a)}}$	$Q_{\rm CO}$	$2.0 \times 10^{30}$ s^-1
CO photodissociation rate^(b)	$\beta_{\rm CO}$	$7.50 \times 10^{-7}~r_{\rm h}^{-2}$
nucleus rotation period	P	11.35 h
Free parameters
fraction of CO in the coma outgassed in the jet		$f_{\rm co}$
jet latitude		$\ell$
jet half-width		$\Psi$
rotation axis aspect angle		$\theta _{\omega }$
rotation axis position angle		$pa_{\omega }$

^(a) Biver et al. (1999a); ^(b) Huebner et al. (1992).

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