The Occultation of a W=10.5 Star for 0.8s by Asteroid 1999 CK109

Sun eve 10:44:23 pm May 10, 2026

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This is a bright star, with a good long duration and should be easy at 1x. On-shore winds may be trouble, though. They were strong in the afternoon. The path just grazes along the north coast of SC County. Davenport is in the centerline.

Alt=39, Az=168 in the SSE, just 2 degrees below Spica.

     

 

Results:

Richard Nolthenius

I drove up to Rodini's Farm and set up 150 ft south of the point opposite the main building, and about 25 ft south of a power pole, on the coast side of Hwy 1. I got a ~1s occultation at 1x,

This is the result if I analyze w/o "analyze in frame mode"

NIE test: 82.8 sigma
magDrop report: percentDrop: 98.9 magDrop: 4.868 +/- 1.851 (0.95 ci)

DNR: 4.95

D time: [05:44:22.9789]
D: 0.6800 containment intervals: {+/- 0.0048} seconds
D: 0.9500 containment intervals: {+/- 0.0119} seconds
D: 0.9973 containment intervals: {+/- 0.0237} seconds

R time: [05:44:23.7495]
R: 0.6800 containment intervals: {+/- 0.0048} seconds
R: 0.9500 containment intervals: {+/- 0.0119} seconds
R: 0.9973 containment intervals: {+/- 0.0237} seconds

Duration (R - D): 0.7706 seconds
Duration: 0.6800 containment intervals: {+/- 0.0071} seconds
Duration: 0.9500 containment intervals: {+/- 0.0160} seconds
Duration: 0.9973 containment intervals: {+/- 0.0276} seconds

Analyzing in field mode, as is proper for a 1x setting, the following solution results:

NIE Test: 76 sigma
magDrop report: percentDrop: 98.2 magDrop: 4.384 +/- 1.268 (0.95 ci)

DNR: 3.80

D time: [05:44:22.9779]
D: 0.6800 containment intervals: {+/- 0.0035} seconds
D: 0.9500 containment intervals: {+/- 0.0087} seconds
D: 0.9973 containment intervals: {+/- 0.0177} seconds

R time: [05:44:23.7532]
R: 0.6800 containment intervals: {+/- 0.0035} seconds
R: 0.9500 containment intervals: {+/- 0.0087} seconds
R: 0.9973 containment intervals: {+/- 0.0177} seconds

Duration (R - D): 0.7753 seconds
Duration: 0.6800 containment intervals: {+/- 0.0050} seconds
Duration: 0.9500 containment intervals: {+/- 0.0112} seconds
Duration: 0.9973 containment intervals: {+/- 0.0207} seconds


         
         

 

Kirk Bender

Kirk Bender observed from Bonny Doon Beach and got a ~1s event.