Activity of (6478) Gault during January 13–March 28, 2019
Authors:
O. Ivanova, D. Tomko, M. Husarik
Image & caption:
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Image caption::
Colour maps constructed for the images obtained on 2019 January 15 are shown in the left-hand column. The maps are coloured according to colour indices in magnitudes, as indicated in the colour bar at the top of the image. The projected directions toward the Sun, north, east, and the negative velocity vector are indicated. The corresponding radial profiles of the dust colours along the tail in the different filters are shown in the right column.
Description:
We present the results of photometric observations of active asteroid (6478) Gault performed at heliocentric distances from 2.46 to 2.30 au and geocentric distances from 1.79 to 1.42 au between 2019 January 15 and March 28. Observations were carried out at the 2.5-m telescope of SAI MSU (Caucasian Mountain Observatory) on 2019 January 15 and at the 1.3 and 0.61-m telescopes (SPb) on 2019 February 6 and March 28, respectively. The direct images of the asteroid were obtained with the broad-band B, V, and R filters. Comet-like structures were detected at all observation dates. Colour maps were built and colour variations along the tail for the observation made on 2019 January 15 were analysed. The dust-productivity (Afρ) was calculated for the R filter, and the evaluated value varies from 47 to 32 cm for the period from 2019 January to the end of March. The rotational period of the body is estimated from the light curve by different methods and is about 1.79 h. Possible mechanisms of triggering Gault's activity are discussed.
Reference:
Monthly Notices of the Royal Astronomical Society, 496 (3), 2636–2647, (2020)
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