Post on 28-Dec-2015
Tests of AST3-2 at Xinglong
Date: late Feb – early April
Tests:focusingpointing, trackingoperation & data systemauto-surveyreal-time pipeline & databaseremote control
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!
Focusing
Steps:
• Frames at diff. f
• FWHM measurement
• Fitting
Influences:
• Seeing
• Unsteady due to movement
Pointing Time
Neighbor field: 1.5 degree
Firstly criterion RMS<2“, 40sec
0324 20sec, but elongated
0409 RMS<1.5”, <15sec, unelongated
Trail of Bright Star
Movement of the center when both tracking and untracking
Cause:Seeing?Shake of the telescope?