From: Milton Aupperle <milton@outcastsoft.com>

Date: August 20, 2012 10:31:20 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: NGC 7331 and NGC 891

Hi John;

Thanks..

That was with the "Grasshopper 2" (GS2-FW-14S5) EXHAD Camera for imaging with the long exposure low noise firmware load (still not released by PGR though).

For guiding, I used  my old "Grasshopper 1" EXHad Camera on a Celestron OAG and my "ST4 to GPIO" adapter, as is explained here:

http://www.outcastsoft.com/AstroImages/AstroIndex.html

HTH..

PS: I images NGC 6946 with 20 minute lumas frames last night.

Milton Aupperle

On 2012-08-20, at 5:58 AM, jjkastro@mac.com wrote:

Very nice work Milton.

Which specific Luma camera did you use, and what did you use to autoguide the mount?

Best,

John

--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@...> wrote:

Hi Tim;

Thanks..

Two more preliminary LRGB images that I just got finished from last night (up until 3:40 am).

The Bubble Nebula NGC 7635:

http://www.outcastsoft.com/Prototype/NGC7635_20120819_MJA.jpg

and then Galaxy NGC 891:

http://www.outcastsoft.com/Prototype/NGC891_20120819_MJA.jpg

Same settings as NGC 7331 image.

I was surprised that with a 5 second exposure binned 4x4 and high gains, the bubble outline was visible.

The halos around stars on the left half of the NGC891 image is condensation. It was down about 10°C at 1 am and the cooling pushed it down to 2°C with 60% humidity. I should have turned the cooler off for 5 minutes and let it heat up and dry off the cover plate.

Seeing was a little more turbulent (3.5 to 4.0 arc seconds FWHM) and there was a high thin haze in the sky that dropped the sky by about 0.5 to 1.0 magnitudes.

TTYL...

Milton Aupperle