From: Milton Aupperle <milton@outcastsoft.com>

Date: January 1, 2012 4:41:58 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: NGC 2903


Hi Terrence;


How fast the camera can operate will depend on how much gain you have applied. Gain is logarithmic and varies with the camera and CCD model used.


Since your only interested in timing too, you would likely run in a binned 2x2 or binned 4x4 mode too.


SNR will depend on gain and how much light pollution and haze you have. The higher the background scatter, the lower your SNR.


I have done Photometrics binned 2x2 with Astro IIDC with good (< 0.001 measured mag SNR) results:


http://www.outcastsoft.com/AstroImages/Lucretia_20111025_MJA.png


The best way to learn what to use is to find a star field with Mag 9 to 11 stars and try it.


HTH..


Milton Aupperle


On 2012-01-01, at 7:09 AM, Terrence Redding wrote:


Very nice Melton.  I trust you had a good New Years eve and that this year will be filled with success and happiness.


Just curious if you know.  Last night I was attempting an occultation of a 9th mag star by a Trojan Asteroid.  Do you have any feel for what frame rate would be needed by a DMK21 so get a good signal to noise ratio on such a target?  I had planned to use 60 frames per second with my F5 14" but could not find the adapter to plug the camera into this Macbook Pro - so had to go another video camera route.


Terry - W6LMJ