[BAA Comets] Comet 17P/Holmes: A marked outburst on January 26

[Richard Miles]

I've measured your frames, Nick.
I used a 30 arcsec diameter aperture.

The actual coma is 15-20 arcsec across and looks asymmetric in appearance.

COD 970
OBS N. James
MEA R. Miles
TEL 0.28-m f/10 Schmidt-Cassegrain + CCD
ACK MPCReport file updated 2015.01.28 19:47:05
AC2 ndj at nickdjames.com
NET UCAC-4
0017P         C2015 01 28.79976 04 05 36.33 +42 26 18.2          14.57N 
970
0017P         C2015 01 28.80049 04 05 36.33 +42 26 18.1          14.60N 
970
0017P         C2015 01 28.80123 04 05 36.39 +42 26 17.8          14.61N 
970
0017P         C2015 01 28.80196 04 05 36.39 +42 26 17.6          14.60N 
970
0017P         C2015 01 28.80269 04 05 36.41 +42 26 17.1          14.64N 
970
0017P         C2015 01 28.80341 04 05 36.42 +42 26 16.6          14.62N 
970
0017P         C2015 01 28.80414 04 05 36.45 +42 26 16.3          14.63N 
970
0017P         C2015 01 28.80487 04 05 36.45 +42 26 16.1          14.65N 
970
0017P         C2015 01 28.80561 04 05 36.46 +42 26 15.4          14.57N 
970
0017P         C2015 01 28.80634 04 05 36.50 +42 26 15.3          14.51N 
970
0017P         C2015 01 28.80707 04 05 36.52 +42 26 14.8          14.62N 
970
0017P         C2015 01 28.80780 04 05 36.52 +42 26 14.5          14.62N 
970
0017P         C2015 01 28.80854 04 05 36.53 +42 26 14.2          14.56N 
970
0017P         C2015 01 28.80927 04 05 36.58 +42 26 14.4          14.59N 
970
----- end -----

Nice!!
Richard


----- Original Message ----- 
From: "Nick James" <ndj at nickdjames.com>
To: "BAA Comets discussion list" <comets-disc at britastro.org>; "Richard 
Miles" <rmiles.btee at btinternet.com>
Sent: Wednesday, January 28, 2015 7:25 PM
Subject: Re: [BAA Comets] Comet 17P/Holmes: A marked outburst on January 26


> Richard,
>
> Using non-offset stacks in Astrometrica to get the ZP and aperture 
> photometry in IRIS using a 30 arcsec aperture I get 14.5 using an 
> unfiltered ST9. The detected coma diameter is 30 arcsec.
>
> Nick.
>
>
>
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