The Wide-field Photometric System of the Nanshan One-meter Telescope

TL;DR

The paper describes the design, calibration, and performance of the Nanshan One-meter Wide-field Telescope, highlighting its capabilities for variable source detection and time-domain surveys since 2013.

Contribution

It presents the first detailed report on the system's design, calibration procedures, and performance metrics for the NOWT, including its scientific goals and observational capabilities.

Findings

Field of view is 1.5° x 1.5°.

Calibration coefficients were accurately determined using Landolt standard stars.

Limiting magnitudes for various exposure times are provided.

Abstract

The Nanshan One-meter Wide-field Telescope (NOWT) is a prime focus system located at Nanshan Station of Xinjiang Astronomical Observatories (XAO). The field of view(FOV) was designed to 1.5 degree *1.5 degree, and Johnson-Cousins UBVRI system was chosen as the main Filter set. The telescope has been providing observation services for astronomers since Sept. 2013. Variable source searching and time-domain surveys are the main scientific goals. The system's test results are reported including linearity, dark current, bias, readout noise and gain of the CCD camera. The accurate instrumental calibration coefficients in UBVRI bands was driven with Landolt standard stars during photometric nights. Finally, the limiting magnitudes are given with signal-to-noise ratios and various exposure times for observers.