Author Topic: 10 minute sub at 2 meters  (Read 1004 times)

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Rocket Pooch

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10 minute sub at 2 meters
« on: Oct 12, 2008, 23:41:15 »
Star
BSC 45 Eps Cas
Visual Magnitude: 3.38


Daniel

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Re: 10 minute sub at 2 meters
« Reply #1 on: Oct 13, 2008, 00:28:54 »
wow, that's some seriously tidy guiding, wish i could get my SCT to guide that well on the CGE but it's way overloaded :(

What's that flying through the shot?

Rocket Pooch

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Re: 10 minute sub at 2 meters
« Reply #2 on: Oct 13, 2008, 07:57:16 »
some form of satellite


JohnP

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Re: 10 minute sub at 2 meters
« Reply #3 on: Oct 13, 2008, 08:03:12 »
Not bad I suppose..... :-( Stars not quite perfectly round but for a single sub - wow!... What were the stats in AstroArt...?

Is that a black hole I can see on the left....?


John

Rocket Pooch

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Re: 10 minute sub at 2 meters
« Reply #4 on: Oct 13, 2008, 08:21:28 »
Hi,

Yes back to the realms of dust doughnuts due to low s/n,

the stats in AA guided with the 400mm scope we're 0.080 DEC and 0.010 RA pixels, FWHM 2.2 ADV best, so not good seeing, not worried about the stars being .057 not as good as the .0133 I get with the ED80, but the focal length is obviously why.

Hey I used the CLS filter and in my well illuminated garden with the moon and some cloud the sky reading was 32k ADU!!!!!!!  Cool eh, bring on the 132ADU from France :-)

Anyway, just wanted to ensure it worked ok, will not go for it at 2 meters, I will use the AP67CCD to get 1,340mm @ F6.7 this should be about ok for the winter targets, and the elongation should go to .038 approx.

Chris


RobertM

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Re: 10 minute sub at 2 meters
« Reply #5 on: Oct 13, 2008, 08:38:34 »
It might be guiding or drift causing elongation but as you say it will be better with the reducer.  Should work out quite a nice image scale and FOV with the 8" and the 314 as I found the reduced 9.25 and H9 just a tad too narrow for some targets.

Just wondering why you're getting elongation in one direction only.  Does that line up with either the RA or DEC axis ?
 

MarkS

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Re: 10 minute sub at 2 meters
« Reply #6 on: Oct 13, 2008, 13:15:58 »
Chris,

Showing my ignorance here - what's ADV?

Mark

Rocket Pooch

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Re: 10 minute sub at 2 meters
« Reply #7 on: Oct 13, 2008, 14:09:58 »
Average I think, I think the drift is flexture, its going to be one way due to gravity!!!