Using the autoguiding feature of the program IRIS it is possible to generate an ascii file with the DEC/RA corrections along the time.
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| The setup |
Gamma Andrómedae (Almach) was the choosen double star to determine the pixel/arcsec value using the separation (9,57") published in Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002). The test star was alfa Ceti (Menkar) with declination 4° , having transited the meridian during the test.
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| Gamma Andrómedae |
The graph below shows an +-15 arcsec error with some spikes during 26 minutes test, but with a somewhat sinudoisal shape. It's also obvious a ~8.5 minutes period. This is normalized graph. there was an continuous RA drift due unbalance.
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