The Occultation of a W=7.3 Star by Asteroid 2002 NF39

Wed eve at 9:33:52pm

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This is an extremely bright occulttation and lasts 1.2s - very nice! But, the RUWE is 3.95, which means the star error is large. And the orbit isn't super great either, So the odds of a miss even on the centerline are probably at least 50%. But being so long and bright, it's an excellent candidate for moonlet hunting. Use 1x and keep the star bright but hopefully unsaturated. It's also a good candidate for diagnosing if the target star is a double star, but that does require avoiding saturated pixels.

It's also only 18 degrees from the moon.

Alt=60, Az=229 in Taurus, in the Hyades Star Cluster, 3 degrees left of the apex of the "V"

     

 

Results

 

Richard Nolthenius

         

 

Kirk Bender

 

         

 

Karl von Ahnen

Jan 28 9:33:52 (203688) 2002 NF39 S of Rock 1X, clear, bright moon, med. seeing. (Telescope tracked w/o correction for 1.5 hours!)  Star was very bright. Only one other (dimmer) star in field. Put slightly out of focus. No visible blink. Processing: Anomalous sharp deep dip for .0434sec. , Target and Ref stars wandering out of their boxes.Finally used dynamic mask aperture with aperture size of 71 and mask size 6.0 for target and Ref1 stars. Finally got no event, which was what I saw even when stepping through recording frame by frame. Reported a miss.