This event is a narrow path centered on Karl's place, and not far from the Bonny Doon Church where I'll try it. 0.7s duration, full drop. Az=59 Az=109. Bright moon only 22 deg away, keep integrations short, even if hard to see.
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Odds of a hit were only 40%, but the result was a solid positive within 1 second of the predicted time, satisfied the FP test just fine. 4x setting, The rest of the settings were standard; sharpness=4, gain=41, gamma=1.
Below is the first reduction and not the final better reduction to follow. I used 5 px radius static apertures, no reference star calibration.
magDrop report: percentDrop: 78.3 magDrop: 1.658 +/- 0.483 (0.95 ci)
DNR: 2.89
D time: [05:10:58.1288]
D: 0.6800 containment intervals: {+/- 0.0216} seconds
D: 0.9500 containment intervals: {+/- 0.0624} seconds
D: 0.9973 containment intervals: {+/- 0.1454} seconds
R time: [05:10:58.6341]
R: 0.6800 containment intervals: {+/- 0.0216} seconds
R: 0.9500 containment intervals: {+/- 0.0624} seconds
R: 0.9973 containment intervals: {+/- 0.1454} seconds
Duration (R - D): 0.5054 seconds
Duration: 0.6800 containment intervals: {+/- 0.0326} seconds
Duration: 0.9500 containment intervals: {+/- 0.0768} seconds
Duration: 0.9973 containment intervals: {+/- 0.1600} seconds
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2nd Analysis
I then tried a second analysis; using TME and a ref star using metric interval minimization too. I also employed the vertical median noise filter. The FP test improved, the light curve looked a cleaner. The mag drop was deeper, as appropriate as well. DNR was stronger at 4.41 vs. 2.89. Timing accuracies were much improved, by a factor of 3.
MagDrop report: percentDrop: 85.3 magDrop: 2.085 +/- 0.283 (0.95 ci)
DNR: 4.41
D time: [05:10:58.1243]
D: 0.6800 containment intervals: {+/- 0.0113} seconds
D: 0.9500 containment intervals: {+/- 0.0280} seconds
D: 0.9973 containment intervals: {+/- 0.0530} seconds
R time: [05:10:58.5874]
R: 0.6800 containment intervals: {+/- 0.0113} seconds
R: 0.9500 containment intervals: {+/- 0.0280} seconds
R: 0.9973 containment intervals: {+/- 0.0530} seconds
Duration (R - D): 0.4631 seconds
Duration: 0.6800 containment intervals: {+/- 0.0164} seconds
Duration: 0.9500 containment intervals: {+/- 0.0364} seconds
Duration: 0.9973 containment intervals: {+/- 0.0653} seconds
Composite light curves, occultation target is in gold. |
The occultation looks clearer and cleaner in this second analysis inside PyMovie |
The false positive test passed, and with an improved score. This is the first time I've used the latest PyOTE which eliminates the red bar and instead as 1-, 3-, and 5-sigma green bars. |
Zoomed in on the event. I'm quite pleased that the event was so solid and clear given it was only a 12.2 mag star and only 22 degrees from a near full moon. |
I used the smoothing interval which gave the best (lowest) scatter within the metric interval I chose, which was to the right of the event for most of the remained of the taped interval. |
Clear skies and initially found target, but telescope drift and lack of time combined to fail target star ID and getting/staying on target. No data. Karl's track was close to mine and he very likely would have had a positive.
Out of town on Christmas weekend. Did not attempt.
