From: Alan Friedman <alan@greatarrow.com>

Date: August 19, 2012 11:42:19 AM MDT

To: Astro_IIDC@yahoogroups.com

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

NIce!

cheers,

Alan

On Aug 19, 2012, at 1:34 PM, Milton Aupperle wrote:

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