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Detail in the Soul Nebula

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#26 DrDispatch

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Posted 17 December 2013 - 07:08 PM

i can go 20 min most times, almost every time i go 30 min something happens.
also I do not see much gain on my system above 15-20 min.

#27 SergeC

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Posted 17 December 2013 - 07:16 PM

Agreed, Madratter - too much denoising makes things look far worse.

I'm curious about why you are limited to 5min exposures with a guide scope. What problems are you seeing at longer exposures?

Me, too. I'm over the half-max load on my CGEM, and can get 15min at 800mm focal length, guiding with a Mag-Mini, and not have to throw away any subs (last night I shot 4 hours worth at 15min each, kept 'em all).

#28 jbalsam

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Posted 17 December 2013 - 07:28 PM

Well... Madratter is using a heavier camera than you are, Serge. Maybe that's causing additional flexure in the focuser/mirror cell connection? :shrug:

#29 Madratter

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Posted 17 December 2013 - 08:19 PM

Serge is shooting the AT8IN, not the AT8RC so he doesn't have the same problem in terms of the mounting of the mirror cell. And the heaviness of the camera is probably a factor.

#30 SergeC

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Posted 17 December 2013 - 09:56 PM

OK, that makes sense.

#31 Madratter

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Posted 17 December 2013 - 10:07 PM

That's close to the same FOV I used for my image of this one, great job!


Thanks! I went looking for yours. Very nice. :)

#32 Madratter

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Posted 18 December 2013 - 10:31 PM

Well we are dancing in the moonlight tonight gathering some more data for this. Actually, I already have all the subs and have switched to another target. I got some color data but more importantly, I got some 10m subs that look pretty good. As far as ideal exposure time, SGP was telling me 15.7 minutes for Ha at 2x2.

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#33 hytham

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Posted 19 December 2013 - 12:59 AM

What State do you live in?

I haven't had a clear sky in weeks.

#34 Madratter

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Posted 19 December 2013 - 02:39 AM

Maryland. I don't have the best skies in the world, but far from the worst.

#35 terry59

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Posted 19 December 2013 - 06:55 AM

Maryland. I don't have the best skies in the world, but far from the worst.


I think you live in an alternate universe! :grin:

#36 jbalsam

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Posted 19 December 2013 - 02:18 PM

I'm in MD, too (Montgomery County). Isn't it great how the clear nights always seem to land near the full moon?

#37 Madratter

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Posted 19 December 2013 - 02:23 PM

It does seem to work out that way. :p

#38 Madratter

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Posted 19 December 2013 - 07:19 PM

As mentioned, I got some more data last night: RGB of 30, 30, and 35 minutes, plus another 110 minutes of Ha. 90 of that was with 10 minute exposures, which really helped. Total integration time is now 380 minutes (6 hours 20 minutes).

The color version can be found here:

Posted Image

And here is a crop of the processed HA data.

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#39 terry59

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Posted 19 December 2013 - 07:41 PM

The additional Ha smoothed the faint stuff and the blend went very well. :waytogo:

#40 CounterWeight

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Posted 19 December 2013 - 08:03 PM

Madratter that is nice stuff, very nice! I'd love to see a mosaic at this resolution projected on a wall screen ;) .

#41 DrDispatch

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Posted 20 December 2013 - 09:27 AM

awesome results MR!!!!
looks like tracking is dead on.
I have same mount, been bragging on guiding. not been so good lately. next session will be re learning guiding, settings etc.

#42 Madratter

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Posted 20 December 2013 - 11:31 AM

Thanks! Given the color data was collected at full Moon, I'm pretty pleased with how it came out. :)

Terry, the extra HA really did help a lot as did the longer subs. It is visible in the crops here, but especially at full size.

Jim, I would too. One of these days I have to figure the Mosaic stuff out. I tried one on the horsehead and it was a disaster around Alnitak. And that was in just HA.

Dr., I find with my Atlas that balancing is critical, especially for stuff around 20 degrees or so declination. I have also found that at least with PHD2 (I think this happened with PHD1 as well), something weird is going on. I can have pretty bad tracking, deselect and reselect the same star, and then tracking can be great. I don't understand that at all. At any rate, with this being high declination, good tracking is easier to achieve.






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