1. Astronomical Video Reduction Software 1 Hristo Pavlov IOTA 2011, 17 June 2011

2. 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

3. 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

4. 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. 7 Low Pass Filter – LP

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9. 9 Low Pass Difference Filter – LPD

10. Demo 10

11. Video Astrometry Accuracy ~ 0.2 pixels (~ 0.3 arcsec) Fast moving objects Measuring multiple frames Scientific value Near Earth Asteroids (NEA) Comets 11

12. Tangra Astrometry - Requirements Star catalogue – UCAC2, UCAC3 or NOMAD Calibration Take video of a known field Manually identify three stars 12

13. Astrometry of NEA 13

14. Astrometry - NEA 14

15. Astrometry - Comet 15

16. Astrometry – Comet 16

17. Questions? http://www.hristopavlov.net/Tangra/ 17