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Comet C2017 S3 PanSTARRS

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About this observation
Observer
Alan Snook
Time of observation
17/07/2018 - 00:30
Object
Comet C2017 S3 PanSTARRS
Observing location
East Kent
Equipment
0.5m Dobson-mounted Newtonian
17mm Ethos eyepiece x 120
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The comet is unexpectedly big and bright. Comparing it with galaxy M81 which is at a similar altitude, it is somewhat brighter and larger than the galaxy’s core. M81 is 6.8m all in, so I estimate the comet at 7.0m. Comet diameter is about 4 arc minutes. At times it seemed to have an extended oval outline to NW, but this is very difficult to estimate because it fades out to a low surface brightness edge. The coma is a fairly uniform brightness across much of its diameter. No tail, colour or structure was detected.  Motion to the ESE was obvious after 15 minutes. In 30 minutes it moved about 1.5 arc-minutes. The faint star shining through the halo was only spotted at the end of the observation, as the comet moved off it.  

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