Periodic Error
Improving Unguided Imaging
Improving Unguided Imaging
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<strong>Periodic</strong> <strong>Error</strong> What is it? What causes it? How significant can it be?
Conventional ways tocorrect <strong>Periodic</strong> <strong>Error</strong> Manual guiding– Tedious– <strong>Error</strong> prone Autoguiding– Affected by seeing (need steady skies)– Correction delay can reduceeffectiveness.
Correcting PE withSoftware Model periodic error over multipleworm cycles Subtract drift Create a smoothed PE curve Playback the inverse of the curve inperfect phase Confirm results Refine if necessary
PEMPro PEMPro is a software application thatdoes all of that and more Advantages include:– Does not require great seeing– Does not require perfect polar alignment– Does not require any mathematical skills– Does not even require an autoguider (justa CCD camera)
Tracking Rate Correctionwith software Extrapolation method All-Sky model method Specific Declination method
Extrapolation Method Example: PulseGuide Method: Follows a star for a shortinterval and extrapolates motion Effectiveness: Good Drawbacks: Only good for immediatearea and for a limited time Best For: Quick and dirty unguidedimaging
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