A Search for Variable Stars and Planetary Occultations in NGC 2301. I. Techniques

We observed the young open cluster NGC 2301 for 14 nights in 2004 February using the orthogonal transfer CCD camera OPTIC. We used point‐spread function shaping techniques (“square stars”) during the observations, allowing us to obtain a larger dynamic range (4.5 mag) of high photometric precision results (≤2 mmag). These results are better than similar observing campaigns using standard CCD imagers. This paper discusses our observational techniques and presents initial results for the variability statistics found in NGC 2301. Details of the variability statistics as functions of color, variability type, stellar type, and cluster location will appear in Paper II.