1 / 16

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.

mckile
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related