The Occultation of a W=12.5 Star by Asteroid 2000 EA104

Nov 4, 2024 at 2:21:59am

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This is a high rank event going centrally across Santa Cruz (not Karl, unfortunately). It lasts 0.9s and is at alt=45, Az=106 in the East. Nicely visible from home for me, but if I can get some sleep ahead, I'll drive up to Shark Fin Cove to try this one, and the 2000ON37 event 18 minutes earlier. Path does not reach Karl.

     

 

Results

Richard Nolthenius

Live look on monitor I estimate was a ~0.8s positive. Observed from parking lot of Shark Fin beach. I used 8x setting. In hindsight, this was much too high. I could have used 2x, from the looks of my dark video background. The event was extremely high S/N and contrast. Timing accuracies still look quite good. A 0.76s event. Gamma was left at 0.85 as is my default lately.

My site was the south end of the parking lot for Shark Fin Cov, level with the beginning of the hwy guard rail. This was the second event (after 2000 ON37) of this evening from this spot.

magDrop report: percentDrop: 95.9 magDrop: 3.473 +/- 0.972 (0.95 ci)

DNR: 5.27

D time: [10:21:58.1315]
D: 0.6800 containment intervals: {+/- 0.0180} seconds
D: 0.9500 containment intervals: {+/- 0.0451} seconds
D: 0.9973 containment intervals: {+/- 0.0885} seconds

R time: [10:21:58.8960]
R: 0.6800 containment intervals: {+/- 0.0180} seconds
R: 0.9500 containment intervals: {+/- 0.0451} seconds
R: 0.9973 containment intervals: {+/- 0.0885} seconds

Duration (R - D): 0.7645 seconds
Duration: 0.6800 containment intervals: {+/- 0.0263} seconds
Duration: 0.9500 containment intervals: {+/- 0.0577} seconds
Duration: 0.9973 containment intervals: {+/- 0.1001} seconds


     

 

Kirk Bender

Observed from Davenport Landing road, got a solid recording.

For 2000 EA104 I got a 0.5338 sec event from Davenport landing road, 8x. Same location as 2000 ON37, the scope was low against my car to shield from the wind, but I still got wind shake on the recording. I did static apertures in pymovie, but it lost tracking at one section, although it recovered and showed a 4 integration event near the predicted time. In PyOTE, I smoothed against a reference star, trimmed out the bad wind shake sections, and it found the event and easily passed the false positive test.

magDrop report: percentDrop: 94.8  magDrop: 3.220  +/- 0.720  (0.95 ci)

DNR: 4.28

D time: [10:21:57.8401]
D: 0.6800 containment intervals:  {+/- 0.0169} seconds
D: 0.9500 containment intervals:  {+/- 0.0446} seconds
D: 0.9973 containment intervals:  {+/- 0.0844} seconds

R time: [10:21:58.3739]
R: 0.6800 containment intervals:  {+/- 0.0169} seconds
R: 0.9500 containment intervals:  {+/- 0.0446} seconds
R: 0.9973 containment intervals:  {+/- 0.0844} seconds

Duration (R - D): 0.5338 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0258} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0579} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0993} seconds