Download 中国mini-SONG项目技术方案介绍

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!