This is a difficult event, 35 deg from the ~full moon. If it lasts the full 0.6s, it might be detectable though.
Alt=26, Az=121 in Aquarius
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I may be the only observer of this one, locally (but perhaps Bernard also??). I observed from home. Kirk and Karl did not try. I could barely see the target at 8x, but it looks visible on each integration as I watched. I did not want to use 16x since the event might be too short to detect. I did get a detection at 8x against a bright sky. In hindsight I think I should have lowered the recording brightness to less than I used, to darken the sky better. A smaller mask aperture may have helped too? The detection is only NIE 0.4 sigma, but using the entire light curve to search it did find it at the correct occultation predicted time.
magDrop report: percentDrop: 72.8 magDrop: 1.413 +/- 0.930 (0.95 ci)
DNR: 1.47
D time: [04:59:07.6929]
D: 0.6800 containment intervals: {+/- 0.1118} seconds
D: 0.9500 containment intervals: {+/- 0.4383} seconds
D: 0.9973 containment intervals: {+/- 0.9984} seconds
R time: [04:59:08.4929]
R: 0.6800 containment intervals: {+/- 0.1118} seconds
R: 0.9500 containment intervals: {+/- 0.4383} seconds
R: 0.9973 containment intervals: {+/- 0.9984} seconds
Duration (R - D): 0.8000 seconds
Duration: 0.6800 containment intervals: {+/- 0.1806} seconds
Duration: 0.9500 containment intervals: {+/- 0.5057} seconds
Duration: 0.9973 containment intervals: {+/- 1.0962} seconds
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Note how poor is the NIE. A detection, but poor confidence it's real. Only 0.4 sigma offset in distributions. |
This event is a good object lesson for my team - note now a 2.4px small mask better eliminates the significant sky counts noise from the 35 degree away near full moon and city lights. Enough to get a decent enough detection, while the detection above is not good enough to justfiy a "positive" judgement, even though the best dip is a positive detection and centered right on the predicted time. The NIE is too poor.
This gives a more solid detection, with NIE of 2.7 sigma. However, the timings are the same. I also trimmed out the first 15s or so, which had a wayward bad spot in ref and target both. Then, I tuned the metric and flatness. The timing accuracies are much better than for the 3.2px mask version.; cutting the confidence intervals in half.
magDrop report: percentDrop: 82.7 magDrop: 1.905 +/- 1.045 (0.95 ci)
DNR: 1.84
D time: [04:59:07.6929]
D: 0.6800 containment intervals: {+/- 0.0693} seconds
D: 0.9500 containment intervals: {+/- 0.2382} seconds
D: 0.9973 containment intervals: {+/- 0.5632} seconds
R time: [04:59:08.4929]
R: 0.6800 containment intervals: {+/- 0.0693} seconds
R: 0.9500 containment intervals: {+/- 0.2382} seconds
R: 0.9973 containment intervals: {+/- 0.5632} seconds
Duration (R - D): 0.8000 seconds
Duration: 0.6800 containment intervals: {+/- 0.1085} seconds
Duration: 0.9500 containment intervals: {+/- 0.2881} seconds
Duration: 0.9973 containment intervals: {+/- 0.6027} seconds
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While the target at 13.7 magnitude is faint, the duration is long enough to get a detection and decent NIE result. |
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The NIE is much better with this narrower mask of 2.4px. Now separation in distributions is 2.7 sigma. Timings are identical, though. And still 0.80s duration.
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Kirk generally finds the best photometry is done with the 2.4px mask size, too.
