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C/2019 Y4 (ATLAS) continues to change


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About this observation
Nick James
Time of observation
11/05/2020 - 22:00
C/2019 Y4 (ATLAS)
Observing location
Chelmsford, UK
C11 Edge HD + FLI6303

Images tonight showsthat the central coma region of this comet continues to brighten, up from 13.9 in an 11 arcsec radius aperture on May 9.9 to 13.5 tonight. Also the bright inner coma has become significantly extended in the tailwards direction and this is affecting astrometric residuals. The inset was obtained with short (20s) exposures in 1x1 binning. The main image is 2x2 binning. It shows the extended inner coma, the forward bar of material which has been visible since around May 1 and two tails, the broad, diffuse one in PA 45 deg and the short, narrow one in PA 30 deg.

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