The Occultation of a W=8.9 Star for 0.85s by Asteroid (74467) 1999 CG44

Mon eve Oct 26, 2026 at 9:03:26pm

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This is a bright event at good altitude. It's not a perfect event; RUWE is 1.30 which is above the 1.20 limit for reliable star position. And, it's only 5 degrees from the very gibbous moon. But if clear, the star should stand out well enough to do it. Use short exposure of course.

Alt=33, Az=79 in Aries, 5 degrees above/left of the moon.

     

 

Results:

Kirk and Karl got positives, I was busy with Astro 3 which ends at 9pm and tried but failed to get set up in time to get on target in the parking lot below the STEM building

Richard Nolthenius

I had to spend too much time with finishing up Astro 3-2 and then rush to my car to try and get on-target. For a star in a weak field only 5 degrees from the full moon, I didn't have enough time to get on target. Got no data. However, based on Kirk's and Karl's timings, it looks like a north shift happened anyway and I'd have had a miss, being just a bit below the southern limit.

 

Kirk Bender

I got a 0.6916s event for 1999 CG44, 1x from home on Oct. 26, time and duration near predicted. There was some wind shake, I tried several different apertures in PyMovie and got the best tracking with size 41 apertures and dynamic masks with low thresholds.  There was only one star suitable for tracking, there was a strong wind shake after the event where it momentarily lost tracking, otherwise tracking was good.

RN: The lost tracking moment is obvious on the light curves, and both target and comparison star show this is a bump and not an occultation.

PyOTE NIE sigma distance = 50.4
magDrop report: percentDrop: 96.9  magDrop: 3.772  +/- 1.167  (0.95 ci)

DNR: 4.98

D time: [04:03:25.6542]
D: 0.6800 containment intervals:  {+/- 0.0028} seconds
D: 0.9500 containment intervals:  {+/- 0.0069} seconds
D: 0.9973 containment intervals:  {+/- 0.0136} seconds

R time: [04:03:26.3458]
R: 0.6800 containment intervals:  {+/- 0.0028} seconds
R: 0.9500 containment intervals:  {+/- 0.0069} seconds
R: 0.9973 containment intervals:  {+/- 0.0136} seconds

Duration (R - D): 0.6916 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0041} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0092} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0165} seconds

 
       

 

Karl von Ahnen

Oct 26 3:03:26 (74467) 1999 CG44 1X from Water Truck turn. Very close to bright moon, Thin cloud visible below area before event. within a couple minutes after event even thicker clouds covered event area no wind, slight scintillation. about 1/2 second event very obvious. Tom joined us for this one.

magDrop report: percentDrop: 95.7  magDrop: 3.417  +/- 0.705  (0.95 ci)

DNR: 4.56

D time: [04:03:24.5055]
D: 0.6800 containment intervals:  {+/- 0.0029} seconds
D: 0.9500 containment intervals:  {+/- 0.0073} seconds
D: 0.9973 containment intervals:  {+/- 0.0139} seconds

R time: [04:03:25.3087]
R: 0.6800 containment intervals:  {+/- 0.0029} seconds
R: 0.9500 containment intervals:  {+/- 0.0073} seconds
R: 0.9973 containment intervals:  {+/- 0.0139} seconds

Duration (R - D): 0.8033 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0042} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0094} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0171} seconds