NGC 247: Not an easy object to image

[sjastro]

A low surface brightness galaxy.
The "noise" is actually stellar resolution.

LRGB image 180m L, 60m R, 60m G, 60m B, ST-10XME BRC-250.

http://users.westconnect.com.au/~sjastro/ngc247c.html

Clear skies

Steven

[Alchemy (Clive)]

it looks quite good steven. nice detail and the background is nice and smooth.

[Ric]

A top capture Steven. you've brought out some great detail and resolution.

Top stuff.

[ngcles]

Hi Steven,

Excellent effort and very well done as the others have said.

But, you just didn't capture NGC 247. You also managed to include most of the elusive "Burbidges Chain" of small galaxies to its east and north east.

Well above the flank at the N end of the galaxy (the one with the huge void in it in the right-hand end of the image, is a small, faint bluish spot above a faint star. Then, further on to the right are three more similar sized ones (the last one looks "double").

These four (five really) are in order, ESO 540-26 (above the star), then -25,-24 and MCG -4-3-12 (the double). That is 4 of the 5 of Burbidges chain (as I understand it). MCG -4-3-12 according to the PGC is Mag 17.0.

The last one (no 5) is probably just off the edge of your frame (did you crop it out possibly??) is ESO 540-23 -- a merging/multiple system that is the most peculiar of the bunch -- really odd-looking on the DSS.

-25, -24, & -23 all have recessional velocities close to the +6350 mark, indicating a distance of 90mpc or just under 300 million light-years (assuming Ho to be 71km/sec/mpc).

Well done!

Best,

Les D

[renormalised (Carl)]

Great shot there, Steve. Plenty of detail in that image and I like the smoothness of the background.

[sjastro]

Originally Posted by ngcles

Hi Steven,

Excellent effort and very well done as the others have said.

But, you just didn't capture NGC 247. You also managed to include most of the elusive "Burbidges Chain" of small galaxies to its east and north east.

Well above the flank at the N end of the galaxy (the one with the huge void in it in the right-hand end of the image, is a small, faint bluish spot above a faint star. Then, further on to the right are three more similar sized ones (the last one looks "double").

These four (five really) are in order, ESO 540-26 (above the star), then -25,-24 and MCG -4-3-12 (the double). That is 4 of the 5 of Burbidges chain (as I understand it). MCG -4-3-12 according to the PGC is Mag 17.0.

The last one (no 5) is probably just off the edge of your frame (did you crop it out possibly??) is ESO 540-23 -- a merging/multiple system that is the most peculiar of the bunch -- really odd-looking on the DSS.

-25, -24, & -23 all have recessional velocities close to the +6350 mark, indicating a distance of 90mpc or just under 300 million light-years (assuming Ho to be 71km/sec/mpc).

Well done!

Best,

Les D

Thanks Les. Unfortunately the RGB images were slightly offset and ESO 540-23 was cropped. Attached is the luminance cropped image.

Regards

Steven

[iceman (Mike)]

Amazing work, Steven. Lovely image of something we don't see often.

[sjastro]

Thanks Clive, Ric, Les and Renormalised.

There was a lot of noise in the background.
It was handled using this technique.

http://users.westconnect.com.au/~sjastro/Tutorial/Background.html

Regards

Steven

[Garyh]

Very nicely done Steven,
I might have to give this a go! shall be a nice challange for a DSLR!
cheers

[Matty P (Matt)]

Nice capture Steven, good detail and very smooth.

Very well done.

[marc4darkskies (Marcus)]

Very nice rendition of a challenging target Steven.

Cheers, Marcus

[jase (Jason)]

A lovely image Steven. Pleasing image scale with natural processing to boot. Good stuff.

[Bassnut (Fred)]

Steven, a tricky bugger its seems, on Googling, nice work, dfferent.

[sjastro]

Thanks Mike, Gary, Matt, Marcus, Jase and Fred for your comments.

Clear skies

Steven