----- Original Message -----
From: "Richard Miles"
To: "Soulier Jean-Francois" ; "Denis Buczynski" ; "Patrick Wiggins" <4099wiggins@gmail.com>; "Nick James"
Cc: "Paul Roche"
Sent: Saturday, January 02, 2021 6:27 PM
Subject: New imaging of 29P from Faulkes Telescope North
> Gentlemen,
>
> Attached is an image of the quiescent nucleus obtained earlier today with
> the new MuSCAT3 instrument on the FT North.
>
> The instrument can take images in four passbands simultaneously!
> So by adding all four channels it recreates what would have been obtained in
> a Clear filter with an exposure of 360 seconds.
>
> I also have noticed that the guiding of the FTN has improved considerably,
> which is great to see.
>
> As and when the comet next outbursts, we can generate colour images
> (grateful for advice on how best to do that given the g', r', i' and z'
> channels are available).
>
> Interestingly, the colour index, r'-z' will be sensitive to the presence of
> water ice: the more ice in the coma, the bluer will this colour index shift.
> This is because water ice has an absorption band in the z' passband. Some
> results w have from JF's remarkable outburst lightcurve of November 19 and
> the subsequent evolution of the coma over the next two days suggest that the
> ice fraction in the outburst coma gradually sublimates away during this time
> interval. Now with the new instrument on the FTN we have a chance to follow
> that process.
>
> Richard
>
NET UCAC4
0029P C2021 01 02.20090 02 14 33.14 +24 21 27.1 16.92R F65 5.6"
0029P C2021 01 02.20281 02 14 33.15 +24 21 27.0 16.95R F65
0029P C2021 01 02.20472 02 14 33.14 +24 21 26.7 16.93R F65
0029P C2021 01 02.20089 02 14 33.13 +24 21 27.1 18.28B F65 5.6"
0029P C2021 01 02.20281 02 14 33.13 +24 21 26.8 18.28B F65
0029P C2021 01 02.20472 02 14 33.13 +24 21 26.6 18.26B F65
NET USNO-B1.0
0029P C2021 01 02.20089 02 14 33.11 +24 21 27.1 16.20I F65 5.6" i' filter
0029P C2021 01 02.20281 02 14 33.10 +24 21 27.0 16.23I F65
0029P C2021 01 02.20472 02 14 33.10 +24 21 26.8 16.15I F65
0029P C2021 01 02.20090 02 14 33.10 +24 21 27.2 16.10I F65 5.6" z' filter
0029P C2021 01 02.20281 02 14 33.10 +24 21 26.9 16.16I F65
0029P C2021 01 02.20472 02 14 33.10 +24 21 26.7 16.08I F65
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