Ki. Churyumov et al., PHYSICAL PARAMETERS OF THE NEUTRAL GAS COMA OF HALLEYS-COMET (1986 III) ON MAY 8, 9, AND 10, 1986, Astronomy letters, 20(4), 1994, pp. 456-460
Spectroscopic observations, performed with a camera equipped with an i
mage tube on the 1-m Zeiss reflector in Assakh (Kazakhstan) on May 8,
9, and 10, 1986, were used to determine the physical parameters of neu
tral gas in Halley's comet (1986 III): production rates of C2, C3, and
CN molecules; characteristic free lengths for parent and daughter mol
ecules: and outflow velocities of comet molecules.