Volume 642, October 2020
|Number of page(s)||4|
|Section||Letters to the Editor|
|Published online||02 October 2020|
Letter to the Editor
Resolving color differences of comet 41P/Tuttle-Giacobini-Kresák
Astronomical Observatory, Taras Shevchenko National University of Kyiv, 3 Observatorna St., 04053 Kyiv, Ukraine
2 Humanitas College, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, South Korea
3 Space Science Institute, 4750 Walnut St., Suite 205, Boulder, CO 80301, USA
4 Astronomical Institute of the Slovak Academy of Sciences, 05960 Tatranská Lomnica, Slovak Republic
5 Main Astronomical Observatory of National Academy of Sciences, 27 Akademika Zabolotnoho St., 03143 Kyiv, Ukraine
6 School of Natural Sciences, Far Eastern Federal University, 8 Sukhanova St., Vladivostok 690950, Russia
7 Institute of Applied Astronomy of RAS, 10 Kutuzova Emb., Saint-Petersburg 191187, Russia
Accepted: 16 September 2020
Three different measurement campaigns have resulted in three drastically different sets of color measurements of Comet 41P/Tuttle-Giacobini-Kresák, ranging from a strongly red to a strongly blue color. Although the color slope is normalized to the wavelength range between the filters used, this only serves to partially normalize the resulting color, as the reflectance of cometary dust has a very strong dependence on particle absorption, which may change significantly over the wavelength range of measurement. We demonstrate that the different measurements are physical and are consistent with real materials; for example, we are able to reproduce the color measured during one epoch in which both strong blue and red color slopes were measured almost simultaneously in different filter sets with the mineral dust pyroxene. Such measurements with different filter sets serve as an additional constraint in modeling dust properties.
Key words: comets: general / comets: individual: 41P/Tuttle-Giacobini-Kresak
© ESO 2020
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