From: jjkastro@mac.com

Date: August 20, 2012 5:58:20 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: NGC 7331 and NGC 891


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


On 2012-08-19, at 10:55 AM, doobisary wrote:


Beautiful work!!


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


Hi Jim;


Thanks.


I just got the preliminary LRGB version done for NGC 7331:


http://www.outcastsoft.com/Prototype/NGC7331_LRGB_20120817_MJA.jpg


That's 16 min luma binned 1x1, 4 min red, 4 min green and 5 minute blue binned 2x2. Darks, flats and luma field rotated by about 0.8 arc seconds for each 16 minute exposure.


I hope to image either NGC 7635 Bubble Nebula or NGC 6946 FireWire Galaxy early tonight (i.e. 11 pm) and then shoot the RGB for NGC 891 that I captured the Luma for the other night.


TTYL..


Milton Aupperle


On 2012-08-17, at 11:42 AM, Jim Chung wrote:


Impressive deep space images Milton!



Jim







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