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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 Plan to setup on the 4 SONG sites in Northern Hemisphere Consists of a 50-cm twin-telescope at each 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 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: Astro Sitall Coating: Al+SiO2, Enhanced Aluminum (SiO2/TiO2) Overcoat Wave front accuracy: ≤1/8λ@633nm 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 mini-SONG telescopes cont. Dome Design Diameter 4m Total height 2.9m Total height when parked 2.5m 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 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 Problems Sites: no confirmation/permission excepts Chinese site Construction: finished preliminary design, need detailed site info to complete final construction design Thanks!