The Occultation of a W= 11.2 Star by Asteroid 2000 OV50

Thur eve Aug 7, 2025 at 9:12:39pm

OWc page

This is another occultation in the very crowded Sagitarrius star cloud. But it's bright, and it lasts 1.0 sec, so if there's an event it should be quite easy. The rank is meh, though, but the RUWE is good. This means the uncertainty is in the asteroid's orbit, not the star position. This is good - it means getting a good positive will really help firm up the orbit. It's big enough and bright enough that the possibility of seeing a moonlet is also good. I'll plan on giving it a try from Scotts Valley SkyPark. It's unlikely to be as far north as Karl, but given the way these things shift around, it's probably worth a look if you have time, Karl.

Alt=18, Az=166  on the right edge of the "spout" of the tea kettle, and 4 degrees to the left of the big open cluster M7 in the tail of Scorpius

You'll need a good horizon.

     

 

Results:

I packed and drove towards Scotts Valley, but didn't get very far before seeing how the fog was rapidly forming and even in the north, towards Scotts Valley. I figured since the target was low and due south, that was the worst direction to avoid fog, and so I bailed out and returned home. Kirk, however, had more tenacity and did observe from Scotts Valley

Kirk Bender

Looks like I got a miss for 2000 OV50, Aug. 8 UT, 2x at Scotts Valley water district, no apparent event.  I was not far from the centerline, but rank was not great.
PyOTE detectability tool reports an event as short as 0.15s would likely be detectable, max predicted was 1.02s.