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We monitor the inner coma of comet 41P/Tuttle-Giacobini-Kres\'{a}k searchingfor variations of its colour. Fast changes in colour of the comet41P/Tuttle-Giacobini-Kres\'{a}k provide important clues for betterunderstanding of the microphysical properties of its dust. Using the 61-cm and70-cm telescopes we measured the apparent magnitude of the comet with the V andR Johnson-Cousins filters from January 29 until April 25 of 2017. The innercoma ({\sim} 2000 km) reveals fast and significant variations of colour. Themost significant change was found between March 3 and 4 of 2017, when itchanged from blue with a colour slope S {\approx}(-10.15 {\pm} 3.43){\%} per0.1 {\mu}m to red with S {\approx} (16.48 {\pm} 4.27){\%} per 0.1 {\mu}m. Thisfinding appears in good accordance with what was previously reported by Ivanovaet al. (2017) for long-period comet C/2013 UQ4 (Catalina), suggesting that fastand significant variations of colour of dust could be a common feature ofshort- and long-period comets. We model observations of comet41P/Tuttle-Giacobini-Kres\'{a}k using the agglomerated debris particles andconclude that its inner coma consists of a mixture of at least two types ofparticles made of Mg-rich silicates and organics or Mg-Fe silicates.

Rapid variations of dust colour in comet 41P/Tuttle-Giacobini-Kres\'{a}k