The Occultation of an 11.6 star by Lanzia

Thur eve Sept 23, 2021 at 2:26:33am, from Santa Cruz

 

This event looks to be a "sure thing" from home and from Bonny Doon and the Santa Cruz Mountains for Karl. Hope the fog stays away. The altitude is 30 degrees. Lasts up to 6.8 seconds

 

   

 

Results

Kirk and I both got good data on this one. He set up a bit north of the bike trail crossing at the Upper UCSC meadow, and I set up about a mile below the fire station at Felton-Empire, not wanting to dare this asteroid to slip by me like the last one did, and not wanting to get too close to the other two tracks - outside of Chicago, and north of New York City.

Nolthenius Data

   

 

PyMovie light curves for target, tracker, and sky. Green is the target

A 5.7 second occultation; PyMovie target light curve

Then ran the .csv file through PyOTE. I used the 2x setting to get maximum time resolution. Skies were clean and the moon was not as bright as full moon 2 days earlier.

False Positive error histogram. Solid!

PyOTE timings reductions

RN's PyOTE log file

Kirk Bender

Kirk set up off Empire Grade a few hundred yards above the upper UCSC Meadow bike path crossing. Got very good data, at 4x setting. He was deeper into the path shadow and had a 6.74 sec event, significantly longer than my 5.67 sec event, and near the expected maximum of 6.8 seconds.

   

KB's PyOTE log file