ast3-2 興隆測試圖像分析

1、Tests of AST3-2 at Xinglong:Image Analysis,Ma BinNAOC2013.05.20,Tests of AST3-2 at Xinglong,Date: late Feb – early AprilTests:focusingpointing, trackingoperation & data systemauto-surveyreal-time pipeline &

2、amp; databaseremote control,High Dark Level,CCD TEC did NOT work wellt_CCD ~ t_air (～0℃)dark: 100ADU/s (sky: 10ADU/s)Pixel-to-pixel varianceLimiting depth!,Field Rotation,Alt-Az mount,Field Rotation,30 sec,Field Rot

3、ation Speed,Limiting Exptime !,Focusing,Steps:Frames at diff. fFWHM measurementFittingInfluences:SeeingUnsteady due to movement,Focal Plane,Pointing Correction,Tpoint:telescope axes .vs.alt-az,Pointing Time,Neig

4、hbor field: 1.5 degree Firstly criterion RMS<2“, 40sec0324 20sec, but elongated0409 RMS<1.5”, <15sec, unelongated,Astrometric Accuracy,0324 M35 1sesScamp Ref cat: PPMXRMS ~ 0.15”,Limiting Mag,0306 open cl

5、uster M44 10sec,Trail of Bright Star,Frame transfer0.43sec 2640 linesbright star -> trailhigh speed sampling,Trail of Bright Star,Movement of the center when both tracking and untrackingCause:Seeing？Shake of t