The last good return of the comet was in 2010 and an analysis of its behaviour appeared in the June 2017 Journal in my paper on the brighter comets of 2010. The comet has a linear type light curve and is intrinsically brightest some 24 days after perihelion, which this time round is in mid October. This light curve suggests that it could already be as bright as 13th magnitude, so it may exhibit a diffuse outer coma. The comet passes 0.4 au from the Earth at the end of September, when it could be 9th magnitude and visible in the late evening sky. It could reach 8th magnitude in early November, but is then a morning object. VEM broadband and visual observations are desirable in addition to the more specialist observations used by the campaign.

Regards,

Jonathan Shanklin
BAA Comet Section visual observations co-ordinator
https://www.ast.cam.ac.uk/~jds/

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