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Fig. 2.

image

Gemini spectrum of 2I/Borisov obtained on 2019 September 24 UT. The spectrum was re-sampled to a resolution of ∼60 (open squares) and binned by a factor of 30, and the continuum of the 2I spectrum was removed using a low-order polynomial model. The red lines are the modeled water ice mixture spectrum using an average particle size of 1 μm, 10 μm, and 100 μm (from top to bottom). Our model suggests that the water ice present in the coma is no more than 10%.

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