21P, Nucleus Now, Mag.13.3
Taken by Odd Trondal on October 7, 2018 @ Oslo
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The light variations can be related to small outbursts and the long term variation can be a perspective effect related to the positions of the earth and sun..

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Software used: TheSky6, CCDSoft 5, MSB Astroart 2.0, Picture Window 2.0,
Perihel 71.77
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