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- W4312156798 abstract "We conducted the earliest polarimetric survey of Comet C/2017 K2 (PanSTARRS) over 10 epochs during February–March 2021, while the comet's heliocentric distance was decreasing from 7.135 au to 6.801 au. Within an aperture radius ρ = 10,000 km, we found slightly varying negative polarization with median value PQ ≈ –2.1% at phase angle α ≈ 8° This appears in quantitative agreement with measurements of other distant comets. The negative polarization reveals submicron and micron-sized dust particles within the coma constrain the imaginary part of the refractive index in at least one type of particles to Im(m) ≤ 0.04. Models earlier developed in Kochergin et al. [1] for the negative polarization in distant Comet 29P/Schwassmann–Wachmann are similar to the negative polarization of Comet C/2017 K2 (PanSTARRS), suggesting its coma could be populated by Mg-rich silicate particles and/or water-ice particles, which are mixed with organic particles and/or amorphous-carbon particles. Modeling dust motion suggests that the inner coma is populated by particles whose age is up to 15 days since their emanation from the nucleus." @default.
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- W4312156798 date "2023-03-01" @default.
- W4312156798 modified "2023-09-27" @default.
- W4312156798 title "Microphysics of dust in a distant comet C/2017 K2 (PanSTARRS) retrieved by means of polarimetry" @default.
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- W4312156798 doi "https://doi.org/10.1016/j.jqsrt.2022.108471" @default.
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