Re: NGC 247 in Cetus

Geof Lewis

Hi Geoff,
That is an excellent image, very well processed, thanks for sharing it. I'd not heard of Burbidge's Chain previously and it really adds to the interest in the overall image. Well done revealing that bridge between those 2 very distant galaxies.


From: <> on behalf of Geoff Smith <ghsmith45@...>
Sent: 06 November 2019 08:47
To: <>
Subject: [ap-gto] NGC 247 in Cetus
Big one here

Mount: AP900 GTO
Telescope: 12.5" Planewave CDK
Camera:FLI 16803 Proline
Exposure: 280min B, 190min G, 200min R, 150 min L.

FOV 37' x 37' (cropped from 49" x 49')

I actually took more L (410 min), but culled ruthlessly.
I also took some Ha (100min) but, although the image showed promise, the data was not good enough for inclusion. On the list for next year is to triple up the Ha and maybe get some better L--great what you can do with digital!

I rotated the image from the conventional E-W orientation. I think this looks much more dynamic.

The string of four galaxies just below and right of NGC 247 is known as Burbidge's Chain. These galaxies are about 300 million light-years distant. Deep images reveal that the two bottom-most galaxies in the chain are apparently interacting, joined by a faint bridge of material. This bridge can just be seen in this photograph.

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