The Occultation of a W=8.8 Star by Asteroid (23346) 4695 P-L

Tue Eve Jan 13, 2025 at 11:54:05pm

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A bright event, with good rank and good RUWE=0.85, crossing downtown Santa Cruz. Kirk and I are both inside the shadow path. Karl not. The only hitch is that it occurs at altitude 77 degrees. It means you'll have to use the diagonal and 0.5x reducer to access the sky at this high altitude, so allow some extra time. My 8SE has trouble doing good pointing at such high altitudes as well.

Alt=77, Az=116  about 10 degrees right angle left of Pollux. The star is rising, which means that at least the altitude is lower during the time we have to locate it.

     

 

Results

Richard Nolthenius

My scope has poor pointing accuracy at high altitude, and I did not allow enought extra time to overcome this. No data.

Kirk Bender

I got a 0.2997s positive for 4695 P-L  on Jan. 13 at home (station "1") on the Astrid 80mm with 0.5x reducer at 30fps (2x).


Station 1 with the Astrid:

NIE sigma distance 34.6
magDrop report: percentDrop: 92.4  magDrop: 2.794  +/- 0.612  (0.95 ci)

DNR: 4.88

D time: [07:54:04.4057]
D: 0.6800 containment intervals:  {+/- 0.0049} seconds
D: 0.9500 containment intervals:  {+/- 0.0120} seconds
D: 0.9973 containment intervals:  {+/- 0.0222} seconds

R time: [07:54:04.7053]
R: 0.6800 containment intervals:  {+/- 0.0049} seconds
R: 0.9500 containment intervals:  {+/- 0.0120} seconds
R: 0.9973 containment intervals:  {+/- 0.0222} seconds

Duration (R - D): 0.2997 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0069} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0152} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0269} seconds

       

I got a miss at Westlake (station "2") on the 8SE using the diagonal and 0.5x reducer at 1x, no apparent event. For the 8SE, PyOTE detectability tool reported an event as short as 0.02s would likely be detectable, max predicted was 0.28s.