The Occultation of a W=12.2 Star by Asteroid 1997 YO

Mon eve Dec 29, 2025 at 11:50:25pm

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This is a good observable event, 3rd such tonight. Duration = 1.6 seconds. The RUWE is 1.7, however, which isn't perfect, but isn't terrible either. Santa Cruz downtown is in the path and I will try from home. Kirk will set up the Astrid at home, and try from the entrance to the Marine lab with the 8SE.

Alt=44, Az=93 in Leo, just few degress above/right of the nose of the Lion. Should be do-able from my carport.

 

     

 

Results:

Richard Nolthenius

I got a recording from the carport at home. A miss. At 4x.

       

 

Kirk Bender

Set up two stations; the Astrid at his home, and the 8SE at the entrance to Natural Bridges on Swanton Blvd. The Astrid on Orion ShortTube was unable to reach that faint, but he got a positive with the 8SE...

I got a 0.6300s event for 1997 YO at 4x on Dec. 30, On Swanton blvd by the Natural Bridges entrance. Duration is much less than the predicted 1.57s max.  I wasn't that far from the centerline, and you got a miss, so the actual path must have been east of predicted. I had the Astrid setup between us at home closer to centerline on the 80mm, but target was too dim/noisy to tell positive or negative.


NIE sigma distance 23.7
MagDrop report: percentDrop: 88.9  magDrop: 2.385  +/- 0.494  (0.95 ci)

DNR: 3.34

D time: [07:50:25.3743]
D: 0.6800 containment intervals:  {+/- 0.0133} seconds
D: 0.9500 containment intervals:  {+/- 0.0356} seconds
D: 0.9973 containment intervals:  {+/- 0.0694} seconds

R time: [07:50:26.0043]
R: 0.6800 containment intervals:  {+/- 0.0133} seconds
R: 0.9500 containment intervals:  {+/- 0.0356} seconds
R: 0.9973 containment intervals:  {+/- 0.0694} seconds

Duration (R - D): 0.6300 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0196} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0452} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0836} seconds