The Occultation of a W=13.2 Star for 0.6s by Asteroid (1412) Lagrula

Sat morn 12:58:13am Nov 22, 2025

OWc page

 

This event is high rank and a low numbered asteroid which should have an already decent orbit. Weather is predicted to be cold and clear. The centerline goes across BD airfield, and Summit Store. Karl is inside the southern limit. My thought was a get together at Karl's Friday night, and as midnight approached, to devote then to the asteroid event, with Kirk and I setting up at the parking lot of Radnovich Ranch, and Summit Store, if the horizon's there are OK.

Alt=29, Az=86 in Leo, off the tip of his nose; 12 deg lower left of the Beehive Cluster

   

 

Results

Richard Nolthenius

The evening started with a movie night at Karl's and socializing. Then Kirk and I left to get the occultation; at Summit Store for Kirk, and at Radonich Ranch for me, while Karl stayed at home. We got a later start out of Karl's, Kirk was able to get set up in time to get a positive. I then drove back up to Radonich Ranch and got set up, now in rush mode as the event was just a few minutes away. In rush mode, I can make mistakes. In this case, as I unpacked, I placed the f/3.3 reducer behind the computer and promptly forgot about it, and after ID'ing the eyepiece view of the target, I swapped on the 1.25" adapter and Watec and tried to focus - utterly failing as the f/3.3 reducer was not mounted. By the time I realized the mistake, I had only 2 minutes till the event, and re-mounting properly I did not have time to focus and get on-target, and got no data.

Kirk Bender

Observed from the parking area northwest of the main Summit Store parking lot, and got a successful event.

Karl von Ahnen

Here is my "uncertain" report for Lagrula. There was a dip with 2 points down at the time of the event, but PyOTE seems to think it is very dubious (?).  (I'm still not sure how to read the histogram.)  I should have used 8X instead of 16X, but ran out of time. It would probably be a more certain positive. I'm including stuff for you to check for what I should claim for this report (neg, pos, uncertain). 
And also stuff for the results page.


Notes:
 Nov 22 (1412) Lagura 12:58:14 Used 16X from Water Truck Turn. Tom joined us. Clear, dark no wind, Could have used 8X, but seemed too dim because screen was dimmed for better night vision was easier when I brightened screen, but it was already time to record. We all saw fast bink at predicted time. 

magDrop report: percentDrop: 53.1  magDrop: 0.821  +/- 0.024  (0.95 ci)

DNR: 2.67

D time: [08:58:14.1768]
D: 0.6800 containment intervals:  {+/- 0.0444} seconds
D: 0.9500 containment intervals:  {+/- 0.1175} seconds
D: 0.9973 containment intervals:  {+/- 0.2296} seconds

R time: [08:58:14.7107]
R: 0.6800 containment intervals:  {+/- 0.0444} seconds
R: 0.9500 containment intervals:  {+/- 0.1175} seconds
R: 0.9973 containment intervals:  {+/- 0.2296} seconds

Duration (R - D): 0.5339 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0659} seconds
Duration: 0.9500 containment intervals:  {+/- 0.1515} seconds
Duration: 0.9973 containment intervals:  {+/- 0.2580} seconds