Interpixel Capacitance in the IR Channel: Measurements Made On Orbit

Using high signal-to-noise pixels in dark current observations, the magnitude of the inter-pixel capacitance (IPC) has been calcucated for the IR channel of WFC3. While the measured IPC magnitude of 6.3% is within 1σ of the value quoted in past reports (Brown, 2008), this work also documents the difference in IPC magnitude in each of the 8 pixels surrounding a central, single pixel source. This document details the test procedure used to measure the IPC and the results, and explains possibilities for correcting users’ data.