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An Introduction to mini-SONG Project

An Introduction to mini-SONG Project. Natioanl Astronomical Observatories Chinese Academy of Sciences. Xiaojun Jiang. Contents:. Overview of the mini-SONG project mini-SONG telescopes mini-SONG instruments progress and project schedule. Overview of the mini-SONG project.

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An Introduction to mini-SONG Project

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  1. An Introduction to mini-SONG Project Natioanl Astronomical Observatories Chinese Academy of Sciences Xiaojun Jiang

  2. Contents: • Overview of the mini-SONG project • mini-SONG telescopes • mini-SONG instruments • progress and project schedule

  3. Overview of the mini-SONG project • Plan to setup on the 4 SONG sites in Northern Hemisphere • Consists of a 50-cmtwin-telescope ateach site • Scientific goals: • General multi-color survey of open clusters • Long term multi-color time-domain observations of selected cluster fields • Superiority: • Global network groups • Long time baseline • High resolutions in frequency space • Multi-color photometry

  4. mini-SONG telescopes • Structure: twin telescope • Aperture: 50cm • Mount:German EQ • Optical system: Ritchey-Chrétien • Focal ratio: F/3 primary; F/9.5 system • Focal length: 4753mm ± 25mm • FOV: 20' x 20' • Wavelength: B or V for one telescope and R for the other (covers Johnson, SDSS, Strömgren systems) • Mirror material:AstroSitall • Coating: Al+SiO2, Enhanced Aluminum (SiO2/TiO2) Overcoat • Wave front accuracy: ≤1/8λ@633nm

  5. mini-SONG telescopes cont. • RC Open Truss Carbon Tube • Precision Secondary Mirror Focuser • Conical Secondary Light Baffle • Lateral roller bearings support mirror cell • Active computer controlled cooling • “light weight” Dovetail Plates Dust Cover over primary mirror • Focuser capacity: 8Kg • RC Field Flattener/Corrector • Direct Drive Mount • 8" RMS pointing accuracy(Zenith distance <70 degree) • Open-loop tracking: 0.1" over 10sec and 0.35" over 300sec RMS • Slew speed: 10deg/s for both axes

  6. mini-SONG telescopes cont. • Dome Design • Diameter 4m • Total height 2.9m • Total height when parked 2.5m

  7. mini-SONG instruments • CCD: • Andor, DZ-936 • Pixel size: 13.5μm • Active pixels: 2048x2048 (20'x20') • Filters • Size: 50mmx50mm • Thickness: 5mm • Positions on each wheel: 4

  8. Progress and project schedule • 2011.6 –Completed project review and evaluation • 2011.7 –Completed detailed design, review and evaluation • 2011.8~2011.10 – Key components order • 2011.11~2012.6 –Telescope structure machining • 2011.11~2012.12 – Control sys.development and debugging 2011.11~2012.12 – Software development and debugging • 2012.07~2012.09 – Telescope assembly • 2012.12– Complete whole structure assembly, development of control system/software/networking, etc. • 2013.01～2013.04 –On-site installation and commissioning • 2013.05 – Acceptance test

  9. Problems • Sites: no confirmation/permission excepts Chinese site • Construction: finished preliminary design, need detailed site info to complete final construction design

  10. Thanks!

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