The Occultation of a W=13.5 Star for 1.0s by Asteroid () Youngjunchoi

Mon eve Mar 9, 2026 at 10:17:19pm

OWc page

 

This is a faint asteroid, but the sky will be dark, the altitude good at 59 degrees, and the duration long at 1.0s so it should be decently do-able. The path is vertical, and to get above fog will require driving up to Locatelli Meadow to get deep enough into the path. Or, much much easier, use my east side Wilder Ranch spot on Hwy 1, if fog stays away. The path doesn't go near Aptos or Karl.

Alt=59, Az=184 in Canis Major

   

 

Results

Richard Nolthenius

I was stuck on the help chat line with BlueHost trying to get fixed the loss of site and uploading ability. When finally solved, it was too late to go for this event, and the fog outside strongly suggested that driving up Hwy 1 wasn't going to succeed anyway. No data.

Kirk Bender

Got a recording at 16x from BD Rd/Hwy 1, where it actually cleared enough to get the event

I got a 0.5338s clear event for Youngjunchoi, 16x at Bonny Doon road near hwy 1, same location as Eunomia 27 min later.
The altitude was high and it was clear in the target area.
The event was 2 integrations at 16x, only half of the predicted 0.98s, and I wasn't far from the centerline.

PyOTE NIE sigma distance = 20.3
magDrop report: percentDrop: 92.8  magDrop: 2.863  +/- 1.107  (0.95 ci)

DNR: 5.19

D time: [05:17:20.1963]
D: 0.6800 containment intervals:  {+/- 0.0315} seconds
D: 0.9500 containment intervals:  {+/- 0.0756} seconds
D: 0.9973 containment intervals:  {+/- 0.1422} seconds

R time: [05:17:20.7301]
R: 0.6800 containment intervals:  {+/- 0.0315} seconds
R: 0.9500 containment intervals:  {+/- 0.0756} seconds
R: 0.9973 containment intervals:  {+/- 0.1422} seconds

Duration (R - D): 0.5338 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0456} seconds
Duration: 0.9500 containment intervals:  {+/- 0.1016} seconds
Duration: 0.9973 containment intervals:  {+/- 0.1790} seconds