CTB1 mosaic

[Tom How]

This has been a bit of an epic job... a 2x2 mosaic of the very faint CTB1 supernova remnant in Cassiopeia.

Go to this page to reach the full sized image http://astro.neutral.org/imagehtml/20130901-ctb1.html and the full res image is pretty huge - at least by my standards. The image posted here is less than half size.

There are somewhere around 60 x 1200s subs making this up taken over 6 moon-free nights with the 8inch F5 newt on the homemade mount with the Artemis 285 camera and the 3nm Astrodon Ha filter.

I've wanted to do this one properly for years... and now finally I can rest

[symesie04]

Thats lovely and i have to say something i have never seen before. 20mins subs on a homemade mount crikey!

[Martin-Devon]

Well done, I've never seen this one before and it's been a big project for you - the end result is very good.

Martin

[andyo]

A new one for me as well,what a great image superb!

[Mark72]

Great work, well done, are you planning color or OIII as well?

Mark

[NickK]

I was going to email if you still used the 285 (I've seen your web page).. it's about the only camera that I've not tested against

Nice image btw!

[johnh]

Well done, mosaic are and ambitious pain, you often regret undertaking - great achievement Tom. The 3nm Astrodon Ha is the best filter especially for faint objects.

John.

[swag72]

A super image of a very faint target. I'd love to see it in colour?!!

[jnc71106]

I agree with Sara a top image that would be great to see in colour

[Tom How]

Thankyou very much for your encouraging remarks!

I am saving my pennies for a 3nm OIII filter, but that will not happen for a while, hopefully I'll get the OIII next year.... astronomy is a long game!

Using a homemade mount adds satisfaction and frustration in equal measure. Good when it works, frustrating when it is having a truculent moment.

The astrodon 3nm is a great filter. I used a 6nm astrodon since about 2006, and this year upgraded to 3nm. I strongly recommend Astrodon filters, and they are much easier to get hold of these days as Ian King carries many of them as stock items.

Mosaics are tricky, especially when you just need that one more good night to finish them. The key to mosaics is planning. Planning and good planning!

[opticalpath]

That's serious dedication, Tom! Very impressive result.

Adrian

[Sam]

What an awesome image. A lot of work has gone into this and it's very impressive.

[Quatermass]

Incredible I have never seen this one and you have done a fantastic job on it.