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TaNgra

Astronomical Video Reduction Software. TaNgra. Hristo Pavlov IOTA 2011, 17 June 2011. LiMovie. Pros Lunar Occultations Fresnel Diffraction Tool Lunar Grazes and Mutual Events Cons Basic tracking “Blind” measurements May need other software ( AviSynth ) Manual update. Tangra. Pros

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TaNgra

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  1. Astronomical Video Reduction Software TaNgra 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

  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

  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

  5. Low Pass Filter – LP

  6. Low Pass Difference Filter – LPD

  7. Demo

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

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

  10. Astrometry of NEA

  11. Astrometry - NEA

  12. Astrometry - Comet

  13. Astrometry – Comet

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

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