CN and NH2 atmospheres of Comet C/1999 J3 (Linear)

Details CN and NH2 atmospheres of Comet C/1999 J3 (Linear) CN and NH2 atmospheres of Comet C/1999 J3 (Linear)

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..267k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 267-268

Physics

Scientific paper

Observations of Comet C/1999 J3 were made at the 2-m telescope of the Pik Terskol Observatory on September 19, 1999. Narrow-band CCD images of the CN, NH2, and dust atmospheres have been recorded using the two-channel focal reducer of the Max-Plank-Institute for Aeronomy. To fit distributions of the CN and NH2 molecules in the comet atmosphere Monte Carlo model was adopted. Model calculations were successful with photodissociation lifetimes equal to τCN=1.5×105s and τ{CNparent}=3.2×104s for CN and its parent, τ{NH2}=1.0×105s and τ{NH2parent}=5.0×103s for NH2 and its parent, respectively. These results are in agreement with HCN as the main source of the CN radicals and NH3 as the main source of the NH2 radicals in the atmosphere of Comet C/1999 J3 (Linear). The gas-production rates of CN, Q(CN)=3.8×1025 mol-1, and NH2, Q(NH2)=2.6×1025 mol-1, have been determined as well. These values are about 0.24% and 0.16%, respectively, of the water production rate.

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