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Astronomical Video Reduction Software 1 Hristo Pavlov IOTA 2011, 17 June 2011
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LiMovie Pros Lunar Occultations Fresnel Diffraction Tool Lunar Grazes and Mutual Events Cons Basic tracking Blind measurements May need other software (AviSynth) Manual update 2
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Tangra Pros Review measurements frame by frame Can open almost all videos directly Workflow. Improved tracking Range of measurement methods Pre-processing and software integration Cons No Lunar Occultations support No Mutual Events support 3
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Tangra - Photometric Methods Papers Mighell, K., 1999, "Algorithms for CCD Stellar Photometry Stetson. P., 1986, "DAPHOT: A computer program for crowded-field stellar photometry", Naylor, T. 1998, An Optimal Extraction for Imaging Photometry Aperture Photometry PSF Photometry Numerical Analytical Optimal Extraction 4
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7 Low Pass Filter – LP
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9 Low Pass Difference Filter – LPD
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Demo 10
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Video Astrometry Accuracy ~ 0.2 pixels (~ 0.3 arcsec) Fast moving objects Measuring multiple frames Scientific value Near Earth Asteroids (NEA) Comets 11
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Tangra Astrometry - Requirements Star catalogue – UCAC2, UCAC3 or NOMAD Calibration Take video of a known field Manually identify three stars 12
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Astrometry of NEA 13
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Astrometry - NEA 14
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Astrometry - Comet 15
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Astrometry – Comet 16
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Questions? http://www.hristopavlov.net/Tangra/ 17
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