Hi Richard,

I also caught 29P this morning in outburst.

Gaia DR2

0029P         C2020 07 27.12189 02 45 34.60 +25 33 03.4          12.9 G      Z10

0029P         C2020 07 27.12498 02 45 34.70 +25 33 04.0          12.9 G      Z10

0029P         C2020 07 27.12885 02 45 34.78 +25 33 04.7          12.9 G      Z10

I’ll send you the images so you can measure them constantly with others.

Peter

Peter Carson

Essex UK

Sent from Mail for Windows 10

From: Richard Miles via groups.io
Sent: 27 July 2020 10:21
To: Comets-ml; BAA Comet Discussions
Subject: [comets-ml] 29P/Schwassmann-Wachmann: Brightest outburst since 2018

Denis Buczynski and Luca Buzzi have this morning independently reported a strong outburst from 29P/S-W1.

The object appears to have brightenened from 17.0R to 12.9R.

The event took place on 2020 07 26.89 +/-0.13.

This is the brightest seen since 2018 September 23, which reached 12.2R.

Since that time a total of 37 outbursts have been identified, the large majority being mini-outbursts (amplitude <1.0 mag).

Also out of these 37, only 3 had attained a magnitude brighter than 14.0R before today's reported event.

The outburst was picked up through a photometric monitoring campaign conducted by a group of amateur astronomers which has been ongoing since 2014.

Here are the latest observations:

0029P         C2020 07 26.13632 02 45 10.54 +25 29 50.5          17.0 R      L09
0029P         C2020 07 26.14079 02 45 10.66 +25 29 52.3          17.0 R      L09

0029P        KC2020 07 26.68996 02 45 24.09 +25 31 40.0          17.1 R      E94
0029P        KC2020 07 26.73162 02 45 25.07 +25 31 48.9          16.9 R      E94
0029P        KC2020 07 26.73438 02 45 25.14 +25 31 48.8          16.9 R      E94

0029P         C2020 07 27.05578 02 45 32.99 +25 32 50.0          12.6 R      I81
0029P         C2020 07 27.05867 02 45 33.08 +25 32 50.6          12.6 R      I81

0029P        KC2020 07 27.08380 02 45 33.68 +25 32 56.1          13.0 R      204
0029P        KC2020 07 27.08645 02 45 33.74 +25 32 56.5          12.9 R      204
0029P        KC2020 07 27.09802 02 45 34.02 +25 32 58.9          13.0 R      204
----- end -----

Observers / (Locations):

L09 - R. Miles (S.Africa)

E94 - J. Drummond (N. Zealand)

I81 = D. Buczynski (UK)

204 = L. Buzzi (Italy)

Further observations are encouraged.

N.B. - A second outburst can follow within an interval of 5-10 days.

Richard Miles

BAA

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