Which FITS header keyword tells me how many pixels were used to determine the aperture for observing an object? Which tells me how many we actually used?
At present there are no keywords in the light curve or target pixel file headers that provide this information. A request has been made to the Kepler Project to have the number of pixels used added to the light curve header. The target pixel data header contains the keyword APER_ID, which gives the aperture used. However, there is no keyword indicating how many pixels make up the aperture or how many of those pixels contribute to the light curve. • Where do I go to find the most recent report on data quirks, peculiarities, flaws, etc.? The Project expects to puts out at least one set of Data Release Notes each quarter. These reports are on the left gutter of the MAST/Kepler home page. The notes detail many of the vagaries of the data, including the latest information on noise sources, “argabrightening,” loss of detectors, and so on. The notes are public even though almost all the data they refer to are proprietary. Users interested in attributes of data for a given quarter should start
