[AZ-Observing] Re: Trapezium Eclipsing Variable Star Light Curve

I am using a 12" LX200 GPS at F/10 with a modified (cooled) DSI Pro 
CCD camera. I have experimented with different exposure times and 
found that 0.500 seconds works fairly well for all filters (BVRI).

You are right on about working at F/10 rather than F/6.3 or 3.3. 
Because the stars are so close to each other in the image it is best 
to have as magnified an image as possible so the individual stars can 
be measured.

Let me know if you are able to get eclipse data.

Jeff

At 13:34 -0700 11/27/06, nishimotog@xxxxxxx wrote:
>tried the trapezium on c8 with pc164 security camera and best at f10 
>not 6.3. stars in trapezium were bright-had to turn gain down.
>
>
>-----Original Message-----
>From: phxjeff@xxxxxxxxxxx
>To: az-observing@xxxxxxxxxxxxx
>Sent: Mon, 27 Nov 2006 12:29 PM
>Subject: [AZ-Observing] Trapezium Eclipsing Variable Star Light Curve
>
>As discussed earlier this month, theta A Orionis (in the Trapezium)
>will undergo an eclipse this weekend (Friday night/Saturday morning.
>The weather outlook is good. While there will be a bight Moon, it
>will not be a problem.
>
>I have been getting baseline BVRI CCD data over the past few nights
>and plan to do an all-nighter Friday/Saturday. Gene Lucas is coming
>by to help. Anyone else interested is welcome. We could use help as
>this can get pretty tiring. Orion is above the observatory walls
>about 10:30 PM MST so we will start about then and continue as long
>as we can. We welcome anyone else who would like to come by or do
>their own photometry. Because the stars are so close together, CCD
>long focal length photometry will work best (no focal reducers).
>
>For more information, please drop me a note.
>
>Jeff

-- 
Jeff Hopkins
HPO SOFT
Counting Photons
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
www.hposoft.com
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