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Tests of AST3-2 at Xinglong: Image Analysis

Detailed assessment of AST3-2 telescope's performance in late Feb - early April, focusing on pointing, tracking, real-time data processing, and remote control amidst challenges like high dark levels and CCD temperature issues. Key findings on field rotation, imaging quality, and astrometric accuracy are discussed.

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Tests of AST3-2 at Xinglong: Image Analysis

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  1. Ma Bin NAOC 2013.05.20 Tests of AST3-2 at Xinglong:Image Analysis

  2. Tests of AST3-2 at Xinglong • Date: late Feb – early April • Tests:focusingpointing, trackingoperation & data systemauto-surveyreal-time pipeline & databaseremote control

  3. High Dark Level • CCD TEC did NOT work well • t_CCD ~ t_air(～0℃) • dark: 100ADU/s (sky: 10ADU/s) • Pixel-to-pixel variance • Limiting depth!

  4. Field Rotation • Alt-Az mount

  5. Field Rotation 30 sec

  6. Field Rotation Speed Limiting Exptime !

  7. Focusing Steps: • Frames at diff. f • FWHM measurement • Fitting Influences: • Seeing • Unsteady due to movement

  8. Focal Plane

  9. Pointing Correction • Tpoint:telescope axes .vs.alt-az

  10. Pointing Time Neighbor field: 1.5 degree Firstly criterionRMS<2“, 40sec 0324 20sec, but elongated 0409RMS<1.5”, <15sec, unelongated

  11. Astrometric Accuracy 0324 M35 1ses Scamp Ref cat: PPMX RMS ~ 0.15”

  12. Limiting Mag • 0306 open cluster M44 10sec

  13. Trail of Bright Star Frame transfer0.43sec 2640linesbright star -> trailhigh speed sampling

  14. Trail of Bright Star Movement of the center when both tracking and untracking Cause: Seeing？ Shake of the telescope？

  15. Thank you !

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