The Occultation of a W=10.5 Star for 0.4s by Asteroid (4214) Veralynn

Sat morn 1:19:41am Oct 4, 2025

OWc page

 

This bright high rank event unfortunately is a low altitude of only 16 degrees in the NE, in Gemini. You'll need a good horizon. The duration is long enough and the star bright enough we may be able to do it at 1x and have a good search for moons.

Alt=16, Az=68 in Gemini; midway between Castor (upper of the two bright stars in Gemini) and M35 in the foot of Castor.

 

     

 

Results:

Kirk and I got this one. Karl did not see the announcement and Bernard tried but had interference problems.

Richard Nolthenius

I set up on the east side of Twin Gates, telescope right at the gate opening so a clear view to the low eastern horizon for the target. Conditions were very good - calm. no wind, some humidity but not a problem. good seeing. I used 1x setting and full gain=41. Still, ref2 was saturated. The target was not. I searched for any evidence of a secondary event. The best prospect was 10s before the main event, or 20 diameters. Just 3 points near/at zero or 0.06s duration. There were a couple of other 3 consec low points but this was the lowest, being at zero as expected. I will await Kirk's and Bernard's data to decide if anything was there. Kirk was close to my track, at Skypark in Scotts Valley.

magDrop report: percentDrop: 95.3 magDrop: 3.329 +/- 2.219 (0.95 ci)

DNR: 1.73

D time: [08:19:40.8930]
D: 0.6800 containment intervals: {+/- 0.0086} seconds
D: 0.9500 containment intervals: {+/- 0.0337} seconds
D: 0.9973 containment intervals: {+/- 0.0928} seconds

R time: [08:19:41.1930]
R: 0.6800 containment intervals: {+/- 0.0086} seconds
R: 0.9500 containment intervals: {+/- 0.0337} seconds
R: 0.9973 containment intervals: {+/- 0.0928} seconds

Duration (R - D): 0.3000 seconds
Duration: 0.6800 containment intervals: {+/- 0.0142} seconds
Duration: 0.9500 containment intervals: {+/- 0.0430} seconds
Duration: 0.9973 containment intervals: {+/- 0.1021} seconds

This is the most likely if any secondary events, but Kirk Bender had no hint of an event at this moment, and was close to my track. I'll treat it as a noise artifact.

   

 

Kirk Bender

I got a 0.2764 event for Veralynn, 1x at Skypark in Scotts Valley. Rick, I don't see a possible event 10 sec before, like you were suspecting. Where are you getting your predicted time from? I'm getting it from the OWC map, the time there at Skypark (and at twin gates) shows 8:19:40 UT. But the time on your page is 8:19:41.  It's only a second difference, and not to a fraction of a second, but still my event is a second later than predicted for 8:19:40, and yours on time for 8:19:41.

magDrop report: percentDrop: 89.2  magDrop: 2.420  +/- 0.987  (0.95 ci)

DNR: 1.95

D time: [08:19:41.0106]
D: 0.6800 containment intervals:  {+/- 0.0071} seconds
D: 0.9500 containment intervals:  {+/- 0.0283} seconds
D: 0.9973 containment intervals:  {+/- 0.0909} seconds

R time: [08:19:41.2870]
R: 0.6800 containment intervals:  {+/- 0.0071} seconds
R: 0.9500 containment intervals:  {+/- 0.0283} seconds
R: 0.9973 containment intervals:  {+/- 0.0909} seconds

Duration (R - D): 0.2764 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0118} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0370} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0901} seconds