I suspect that if you have that designation it is probably for very old elements - you need to use some valid for 2020.

The current designation for the comet is 29P/Schwassmann-Wachmann.  Prior to the introduction of the scheme numbering periodic comets they were referred to as for example Schwassmann-Wachmann 1 and Schwassmann-Wachmann 2 (now 31P/ Schwassmann-Wachmann) to distinguish comets with the same name.  If we had stuck to the old scheme there would be a large number of PanSTARRS comets - I think we are probably up to PanSTARRS 13, which instead is numbered 400P/PanSTARRS.

Regards,

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

-----Original Message-----
From: baa-comet@simplelists.com <baa-comet@simplelists.com> On Behalf Of Nick Atkinson
Sent: 16 November 2020 16:34
To: baa-comet@simplelists.com
Subject: Re: [BAA Comets] Observations of 29P

Hi Nick,

Is this the correct one: Comet 29P/Schwassmann-Wachmann 1 [2011]

Nick

On 14/11/2020 14:30, Nick James wrote:
> Comet 29P/Schwassmann-Wachmann is a fascinating object. It orbits
> beyond Jupiter and, compared to the comets that we are used to, it has
> a massive nucleus, over 60km in diameter. It also has frequent outbursts.
>
> The section's 29P observation programme is run by Richard Miles and he
> has recently added a new page to the Comet Section website which you
> can find here:
>
> https://britastro.org/node/24942
>
> This page will be frequently updated with observational news. In fact,
> it currently includes a report of a mini-outburst from yesterday (Nov
> 13), so it is worth checking back regularly to see the latest news and
> analysis.
>
> Our objective is to observe this comet in a standard way so that
> Richard can receives estimates with a high degree of consistency
> between observers. Details of the approach to be adopted are on this
> web page and they are reproduced in the section observing guide which
> you can download from here:
>
> https://britastro.org/node/6817
>
> The comet is now well placed for northern hemisphere observers and we
> would like to receive your observations. If you have not already done
> so please consider adding this fascinating comet to your programmes.
>
> Many thanks to Richard for running this programme and maintaining the
> web page.
>
> Nick James. Director.
>
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