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Speckle Interferometry with mid-sized amateur telescope: why not?

Speckle Interferometry with mid-sized amateur telescope: why not?. Interferometría con un telescopio amateur: ¿por qué no?. L'interférométrie des tavelures avec un télescope d'amateur: pourquoi pas ?. Florent Losse Société Astronomique de France. Gili Nice 74cm Refractor.

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Speckle Interferometry with mid-sized amateur telescope: why not?

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  1. Speckle Interferometry with mid-sized amateur telescope: why not? Interferometría con un telescopio amateur: ¿por qué no? L'interférométrie des tavelures avec un télescope d'amateur: pourquoi pas ? Florent Losse Société Astronomique de France

  2. GiliNice 74cm Refractor Romero40cm Schmidt-Cassegrain Obs. Astronomico de Cantabria Bath50cm Cassegrain IAS, Namibia Trégon,Castets60cm Newton Pic du Midi

  3. Observatory location MPC I93 Newton Diam=408mm Foc.=2052.5mm First lightCOU 407r=0"4 7 img/600 img =1%

  4. Miracle Imaging 2009 Audine Camera F=11960mm E=0"1552/px FOV=2'x1'3 KAF-0400 768x512 9x9mm Min exposure=60ms Frame rate=long !

  5. HU 987 r=1"09 Usuable frames 2% Super-Speckles Exposure time too long, focal length too short, Airy disk spans only 2 pixels, no filter …

  6. Classical processing : fails or difficult task 'Speckle interferometry like' processing does the job ~400 frames is enough No manual sorting, no subjectivity Resolution remains limited With super-speckles

  7. OS 413 HU 940 COU 492 m:9.2/9.8 r=0"5 exp: 7ms m:10.2/10.3 r=0"5 exp: 20ms m:4.7/6.2 r=0"9 exp: 1ms Exp : 2ms Lucky images: 3/400 ~1% 2010 Atik314L+ Camera ICX285AL 1392x1040 6.45x6.45mm Min exposure=1ms Frame rate: (128x128px)=4 fps EFL=11400mm E=0"1167/px FOV=2'7x2'

  8. BU 1127 Near the limit COU1271 Near the limit HU 1178 Audine 60 ms Super-speckles mag 9.4/10 r=0"34 Mag 9.2/9.3 r=0"38 Best 3 Atik 10 ms Best 4 THE best Typical images

  9. Autocorrelation 5x5 masking Quadrant determination Autocorrelation Intercorrelation Spatial image Reductions

  10. With amplification lens Prime focus EFL = F x dm/df Sampling 206.265*px/EFL Sampling in arcseconds - EFL= Effective focal length in mm - px=pixel size in mm Sampling Calibration

  11. E-W axis determination +/- 0°2

  12. Epoch Cameras Nights Nb doubles Nb orbitals Phase I May/Dec 2009 Audine 429 75 41 Phase II Feb/Jul 2010 Atik 63 579 125 138 1008 166 Results

  13. Results Pixel size (0"12x0"12) 43 orbitals Grade 1 & 2 Airy disk O - C

  14. Minimize speckle overlapping Decrease chromatic effects => Expand observable zenithal distance Airy disk f ~ 5 pixels 100nm Future improvements (could be…) Use filter Increase focal length

  15. Conclusion Do we really want to … • observe every clear night no matter the turbulence • optimize the use of the instrument • get accurate measurements • reduce quickly and objectively • work on very interesting population

  16. Speckle Interferometry with mid-sized amateur telescope: YES ! Interferometría con un telescopio amateur: ¡SI!

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