Rapid variations of dust colour in comet 41P/Tuttle-Giacobini-Kres\'{a}k
Igor Luk'yanyk, Evgenij Zubko, Marek Hus\'arik, Oleksandra Ivanova,, J\'an Svore\v{n}, Anton Kochergin, Alexandr Baransky, and Gorden Videen

TL;DR
This study observes rapid colour changes in the dust of comet 41P/Tuttle-Giacobini-Kresák, revealing insights into dust properties and suggesting such variations are common among different comet types.
Contribution
It provides the first detailed observation of fast colour variations in comet dust and models the dust composition as a mixture of silicates and organics.
Findings
Fast colour variations observed in the inner coma.
Significant change from blue to red colour within a day.
Dust likely composed of Mg-rich silicates and organics.
Abstract
We monitor the inner coma of comet 41P/Tuttle-Giacobini-Kres\'{a}k searching for variations of its colour. Fast changes in colour of the comet 41P/Tuttle-Giacobini-Kres\'{a}k provide important clues for better understanding of the microphysical properties of its dust. Using the 61-cm and 70-cm telescopes we measured the apparent magnitude of the comet with the V and R Johnson-Cousins filters from January 29 until April 25 of 2017. The inner coma ({\sim} 2000 km) reveals fast and significant variations of colour. The most significant change was found between March 3 and 4 of 2017, when it changed from blue with a colour slope S {\approx}(-10.15 {\pm} 3.43){\%} per 0.1 {\mu}m to red with S {\approx} (16.48 {\pm} 4.27){\%} per 0.1 {\mu}m. This finding appears in good accordance with what was previously reported by Ivanova et al. (2017) for long-period comet C/2013 UQ4 (Catalina),…
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