The Occultation of a W=11.3 Star for 0.3s by Asteroid (11203) Danielbetten

Sun eve Dec 28, 2025 at 6:10:18pm

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This is bright and should be easy at 1x. However, the RUWE is 1.5 which is slightly worse than the ideal. The path goes just south of Watsonville, is narrow. The best spot I could find it taking the offramp to the Chevon gas station at Hwy 129, and take the dirt road east till it ends at the Hwy 1 embankment.  Moon is 55 deg away

Alt=29, Az=80 in Taurus 5 degrees to the right of El Nath

     

 

Results:

I carpooled Kirk down to lower Beach Rd south of Watsonville. He was on Trafton road about 1/3 mile above the intersection with McClaren Rd. I set up on McClaren Rd at the overpass over the Pajaro River.

Richard Nolthenius

Got a successful recording in the wind, which was stronger it seems at the east berm of the levee of the Pajaro River, with the "airfoil effect" in play, I suspect. I'd wanted to be on the west side berm, but another car was parked there. Hard to deal with because the wind came directly out of the northeast, which was the direction of the target, 29 degrees up. I didn't use the dew shield, and I lowered the legs on the telescope to just one length, and used the damper pads under the tripod. Still, the wind was a real problem as seen on the computer screen. I turned on the recording a minute and a half early, and then used my down jacket and my body to do the "Batman Maneuver" to act as a wind shield as best I could.

Begin: 2:09:01 UT
End: 2:11:34 UT

NIE test = 21.9 sigma
M
agDrop report: percentDrop: 100.0 (magDrop cannot be calculated because A is negative)

DNR: 2.69

D time: [02:10:18.8030]
D: 0.6800 containment intervals: {+/- 0.0099} seconds
D: 0.9500 containment intervals: {+/- 0.0269} seconds
D: 0.9973 containment intervals: {+/- 0.0580} seconds

R time: [02:10:19.2079]
R: 0.6800 containment intervals: {+/- 0.0099} seconds
R: 0.9500 containment intervals: {+/- 0.0269} seconds
R: 0.9973 containment intervals: {+/- 0.0580} seconds

Duration (R - D): 0.4049 seconds
Duration: 0.6800 containment intervals: {+/- 0.0142} seconds
Duration: 0.9500 containment intervals: {+/- 0.0337} seconds
Duration: 0.9973 containment intervals: {+/- 0.0683} seconds


 

Kirk Bender

Got a positive of about 0.3s on first look. On the south side of the centerline

I got a 0.3670s event for Danielbetten, 1x on Trafton rd. in Watsonville. Target curve is noisy, but I got a NIE sigma distance of 10.  There was some wind setting up, so I took off the dew shield, but fortunately it was calm during the recording and PyMovie tracked well with static apertures, I got the best results with a size 2.0 static mask for the target.   I tried dynamic apertures but got better results with static.

NIE sigma distance 10.0
magDrop report: percentDrop: 97.9  magDrop: 4.211  too much noise; cannot calculate error bars

DNR: 1.53

D time: [02:10:18.7714]
D: 0.6800 containment intervals:  {+/- 0.0088} seconds
D: 0.9500 containment intervals:  {+/- 0.0348} seconds
D: 0.9973 containment intervals:  {+/- 0.0768} seconds

R time: [02:10:19.1384]
R: 0.6800 containment intervals:  {+/- 0.0088} seconds
R: 0.9500 containment intervals:  {+/- 0.0348} seconds
R: 0.9973 containment intervals:  {+/- 0.0768} seconds

Duration (R - D): 0.3670 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0148} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0402} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0860} seconds