研究目的
To report the test results of the upgraded photometric system on the 85-cm telescope, including CCD characteristics, photometric calibration, and system performance, to provide guidance for observers.
研究成果
The upgraded photometric system on the 85-cm telescope performs well with high precision. The CCD camera has excellent characteristics, and accurate calibration coefficients were derived. The system's throughput and limiting magnitudes are improved, providing valuable references for astronomical observations. Future work could involve further optimization and application to other telescopes.
研究不足
The dark current measured was higher than specified in the product manual, but impact is small for exposures shorter than 600 s. Linearity tests showed deviations at low exposure times due to shutter effects. The study is specific to the Xinglong station conditions and may not generalize to other locations.
1：Experimental Design and Method Selection:
The study involved testing the CCD camera's characteristics (bias, gain, readout noise, dark current, linearity) and performing photometric calibration using Landolt standard stars. Methods included using IRAF tasks for data analysis and standard photometry procedures.
2：Sample Selection and Data Sources:
Landolt standard stars were selected based on magnitude and color, observed during photometric nights in February, March, and April
3：List of Experimental Equipment and Materials:
20 The upgraded 85-cm telescope with a new corrector, Johnson-Cousins UBVRI filters by FLI, Andor iKon DZ936N-BV CCD camera, and IRAF software for data reduction.
4：Experimental Procedures and Operational Workflow:
Bias, dark, and flat-field images were taken; gain and readout noise were measured using dome flats and bias frames; linearity was tested with dome lights; photometric calibration involved observing standard stars and reducing frames with IRAF's apphot package.
5：Data Analysis Methods:
Data were analyzed using IRAF tasks (findgain, mknobsfile, fitparams), with statistical methods to derive calibration coefficients, throughput, and limiting magnitudes.
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