The Occultation of a W=12.3 Star by Valentaugustus

Wed eve Jan 15 8:51:26pm

OWc page

This is a bright event, lasting up to 0.65 sec so even at 2x we should get good data. It's a wide path, and Kirk and almost Karl are inside the path. I will be closer to the centerline at Twin Gatges upper UCSC.

Alt=36, Az=253 in the WSW, in Pisces 10deg upper left of Algenib (lower left corner star of the Great Square of Pegasus)

 

     

 

Results

Richard Nolthenius

I observed this, the first in a pair of occultations (Erfordia the 2nd, 20 min later), from the east side of the Twin Gates bike path crossing, upper UCSC. My scope in fact was right at the point in the gate where the bikes exit, in order to position correctly to get both targets. Clear skies.

Got a good recording, and a solid occultation. Right at predicted moment, but 70% longer duration than predicted maximum. Interesting!

magDrop report: percentDrop: 94.8 magDrop: 3.207 +/- 1.234 (0.95 ci)

DNR: 3.91

D time: [04:51:25.7740]
D: 0.6800 containment intervals: {+/- 0.0161} seconds
D: 0.9500 containment intervals: {+/- 0.0408} seconds
D: 0.9973 containment intervals: {+/- 0.0819} seconds

R time: [04:51:26.8750]
R: 0.6800 containment intervals: {+/- 0.0161} seconds
R: 0.9500 containment intervals: {+/- 0.0408} seconds
R: 0.9973 containment intervals: {+/- 0.0819} seconds

Duration (R - D): 1.1010 seconds
Duration: 0.6800 containment intervals: {+/- 0.0238} seconds
Duration: 0.9500 containment intervals: {+/- 0.0537} seconds
Duration: 0.9973 containment intervals: {+/- 0.0975} seconds

Note the occultation lasted more than 50% longer than the predicted maximum. And the data below is very solid. Oblong asteroid? Low albedo?

 


       

report sent to IOTA 1/29/25

 

Kirk Bender

I have a positive 0.2669 sec. event for Valentaugustus on Jan 15, 2x at home. The drop is noisy but passes false positive. There is a drop, not as deep, immediately previous to the one PyOTE found, but again could be just noise. PyOTE does not recognize the previous drop even by manual D/R. I'm attaching a PyOTE zoom with and without the no_star for clarity.

PyOTE found a 0.26 sec event (predicted max 0.65) near predicted time.  There is a drop immediately previous to this, not as deep, but PyOTE does not recognize it as an event.


magDrop report: percentDrop: 80.3  magDrop: 1.761  +/- 1.081  (0.95 ci)

DNR: 1.94

D time: [04:51:26.5697]
D: 0.6800 containment intervals:  {+/- 0.0190} seconds
D: 0.9500 containment intervals:  {+/- 0.0689} seconds
D: 0.9973 containment intervals:  {+/- 0.1669} seconds

R time: [04:51:26.8366]
R: 0.6800 containment intervals:  {+/- 0.0190} seconds
R: 0.9500 containment intervals:  {+/- 0.0689} seconds
R: 0.9973 containment intervals:  {+/- 0.1669} seconds

Duration (R - D): 0.2669 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0300} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0850} seconds
Duration: 0.9973 containment intervals:  {+/- 0.1845} seconds