Activity and dust properties of comet C/2020 V2 (ZTF)

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ID: 314970
2026
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Abstract
Abstract Here we present the results of research devoted to a dynamically new comet C/2020 V2 (ZTF). For the study, we used monitoring observations of the comet collected from February to March of 2022 and quasi-simultaneous photometric, spectroscopic, and polarimetric data obtained on June 2, 2022. All the observations were obtained pre-perihelion, when the comet was beyond 4 au from the Sun. The spectrum showed the absence of gaseous emissions above the continuum, allowing us to investigate properties of dust particles in the coma. Despite the large heliocentric distance, the comet was highly active, showing a considerable dust productivity level as the average $\mathit {Af\rho }$ parameter value was about $3883^{+640}_{-250}$ cm. The study of coma morphology revealed a circumpolar ejection, but such location makes it difficult to specifically estimate the parameters of the nucleus rotation. At the same time, neither the colour nor the polarisation maps obtained from the June 2 observational data showed any structures, indicating similar characteristics of dust in the jet and the ambient coma. The comet showed a negative polarisation with the average value of $-1.2 \pm 0.2~{{\ \rm per\ cent}}$ in the r-sdss filter at phase angle α = 12.5○. Modelling of the light scattering showed that dust particles can be represented by moderately porous μm-mm-sized aggregates of submicrometre-sized grains containing water ice, organics, and silicates. Our study shows that comet C/2020 V2 (ZTF) was a typical dynamically new comet with remarkably high activity, which is in particular illustrative of the deviation of such comets from the other cometary populations.
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Authors Voitko Anhelina, Markkanen Johannes, Ivanova Oleksandra, Skorov Yuri, Kleshchonok Valerii, Shubina Olena, Luk’yanyk Igor, Humes Oriel
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag967
URL
https://doi.org/10.1093/mnras/stag967
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