[BAA Comets] 46P/Wirtanen

[Shanklin, Jonathan D.]

It is quite important to look at the error bars.  The MPC rarely give any.  I don't give any in the quick look magnitude parameters at https://www.ast.cam.ac.uk/~jds/magpars.htm, but do in the graphs on the visual observations web page and in the papers published in the Journal.  For 46P see https://www.ast.cam.ac.uk/~jds/46p.JPG When I posted this at the beginning of October the error bars were huge, so it is very likely that different groups will come up with different equations.


Regards,

Jonathan Shanklin


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From: Comets-disc <comets-disc-bounces at lists.britastro.org> on behalf of David Swan <djswanastro at outlook.com>
Sent: 16 October 2018 08:02
To: BAA Comets discussion list
Subject: [BAA Comets] 46P/Wirtanen

Hello,

It is good to see Martin Mobberley keeping us up to date with 46P while it is still at a very southerly declination.

I have been looking at the University of Maryland's 46P campaign page. There's quite a big difference between the fitted (and extrapolated) light curves generated from COBS observations versus MPC obs. Is this due to the former relating to total VEM and latter false nucleus mag? Or does this to some extent reflect very significant uncertainty on peak brightness around perihelion/perigee?

David Swan
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