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Table 9

Composition and size of the dust particles in different directions in the coma of comet C/2011 KP36 (Spacewatch) modeled with the rough spheroid model.

Directions in the coma Observed characteristics Parameters of the model

Material 1 Material 2 Ratio

Color (mag) Polarization (%) Name reff (μm) Name reff (μm)
Near the nucleus
J1 0.45 –3.5 Water ice 0.6 HD + ice, 90% 1.3 6:4
J2 0.42 –3.5 CO2 ice 1.3 Water ice, 1.0 1:9
porosity 50%
J3 0.42 –4.5 Water ice 0.6 HD + ice, 90% 1.3 8:2
J4 0.34 –4.5 CO2 ice 1.0 HD+ice, 90% 1.7 2:8
Coma, PA = 56° 0.38 –3.5 CO2 ice 1.3 Water ice, 1.0 5:5
porosity 50%
Coma, PA = 236° 0.42 –3.5 Water ice 0.6 HD + ice, 90% 1.7 6:4

Far from the nucleus (~75 000 km)

J1 0.46 –3.5 Water ice 0.6 HD + ice, 90% 1.0 6:4
J2 0.38 –3.8 CO2 ice 0.4 Water ice, 1.0 1:9
porosity 50%
J3 0.46 –3.5 Water ice 0.6 HD + ice, 90% 1.0 6:4
J4 0.43 –1.8 CO2 ice 0.4 HD + ice, 90% 1.3 2:8
Coma, PA = 56° 0.43 –1.8 CO2 ice 1.3 Water ice, 1.0 5:5
porosity 50%
Coma PA = 236° 0.46 –3.5 Water ice 0.6 HD + ice, 90% 1.3 6:4

Area of blue color in the direction of J3

Lowest color 0.32 –2.2 Water ice 1.3 HD + ice, 90% 0.6 2:8
End of the feature 0.42 –4.0 Water ice 1.0 HD + ice, 90% 0.6 1:9

Area of low polarization between jets J2 and J4

Lowest polarization 0.35 –1.0 CO2 ice 3.0 Water ice, 1.0 2:8
porosity 50%
End of the feature 0.35 –3.8 CO2 ice 1.3 Water ice, 1.0 2:8
porosity 50%

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