We clearly detected the ingress only at close to the time predicted by the ephemeris. Notes from the night Conditions were decent -- no mention of clouds in the mdReport file and the noise floor was 0.
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The PT sequence on XO-2 ended before the predicted egress time, even though conditions were fine. Was there a typo in the requested time to finish? This is a chart of Sex fucking Cowpens mi field. XO-2 is the bright star indicated by the crosshairs.
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The labelled stars will appear in later analysis. Following the procedures outlined by Kent Honeycutt's article on inhomogeneous ensemble photometry, I used all stars available in each image to define a reference frame, and measured each star against this frame.
You can find the software package used to do the ensemble photometry online; it's free! The night was mostly clear.
The graph below shows the amount by which instrumental magnitudes from each image needed to be shifted to match the ensemble reference. On a clear night, this graph would show a straight horizontal line. Note the clouds coming at the end companikns the observations. Below is a graph of the scatter in differential magnitude versus magnitude in the ensemble solution.
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XO-2 is the star at differential mag 0. The "noise floor" in these measurements is about 0.
Most of the outliers in copmanions plot above are stars near the edges of the frame, or with close companions. Below are the light curves for the target green symbols and four comparison stars in the field. In this closeup, I have shifted the data for two comparison stars to move them closer in magnitude to the target.
for : xo companions
The transit is obvious. I estimate by eye the companionw to start at about An ephemeris grabbed from transitsearch. This is about 12 minutes earlier than the start of the dip which I see in the measurements You can grab the measurements for your own analysis. Below is a table with Kind people make me Sandy flavors of time, plus ccompanions differential magnitude of the target and an estimate of the uncertainty in each measurement.
I show the first few lines of the file to give you an idea of its format.