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Estimating Seeing & PEC Curves
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Rolando (et al),
Below I've included a couple paragraphs you mentioned a while back on evaluating seeing.
I'm about to try and generate some new periodic error curves for my AP1100 (no AE) and I thought I'd gather some data the way you suggested.
These data have 2s guide samples (no delay, no guiding, no modeling) each collected for about 5 RA worm periods (about 32 minutes) with PE Correction disabled.
Both runs started close to the Meridian and Equator, just West of the Meridian.
First run at 9pm, just after astro-twilight, and 2nd run about 9:40pm.
Collected in the SF Bay Area, probably Bortle 5.
Green (RA), Blue (DEC) and Yellow (SNR). Scale on the left is arc-seconds.
Is this how you'd evaluate seeing?
The DEC variation seems ballpark 1 arc-second, once the drift is removed.
I'm surprised the DEC drift in the 2nd run (10" over 32 minutes) is about half that of the first run (20" over 32 minutes). Do you know why that might be? Sky seemed to get a bit better.
On Fri, Nov 11, 2022 at 12:14 PM Roland Christen via groups.io <email@example.com> wrote:
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