The Occultation of a 8.5 Star by Asteroid (4570) Runcorn

Wed eve March 18, 2026 at 8:07:03pm

OWc page

 

This is another very bright event. Good rank. Karl's just above the northern limit and worth a go. It goes right across Jordan's back yard. Kirk plans to try from the Eco Reserve, and I from up Graham Hill Rd at a turnout.

Alt=73, Az=243 in Taurus

     

 

Results:

Richard Nolthenius

I observed from the turnout on the west side of Graham Hill Rd, just a couple hundred yards south of RollingWoods Drive. Conditions were excellent, except for the traffic lights. But the target was vertically overhead and the dew shield worked to keep out competing lights.

Long. 122 02 18.01
Lat. 37 01 32.15
Elev 189m

magDrop report: percentDrop: 99.3 magDrop: 5.352 +/- 0.927 (0.95 ci)

DNR: 7.55

D time: [03:07:02.9349]
D: 0.6800 containment intervals: {+/- 0.0013} seconds
D: 0.9500 containment intervals: {+/- 0.0036} seconds
D: 0.9973 containment intervals: {+/- 0.0066} seconds

R time: [03:07:03.2156]
R: 0.6800 containment intervals: {+/- 0.0013} seconds
R: 0.9500 containment intervals: {+/- 0.0036} seconds
R: 0.9973 containment intervals: {+/- 0.0066} seconds

Duration (R - D): 0.2807 seconds
Duration: 0.6800 containment intervals: {+/- 0.0020} seconds
Duration: 0.9500 containment intervals: {+/- 0.0045} seconds
Duration: 0.9973 containment intervals: {+/- 0.0079} seconds

Used 1x setting, Gain=41, slight defocus. Recorded on camcorder and Lenovo both.

         
 

 

Kirk Bender

I got a clear 0.3011s event for Runcorn, March 18, 1x at the BD eco reserve. Luckily although it was high elevation I could get it without the diagonal and there were two other stars almost as bright I could use for tracking in PyMovie.

PyOTE NIE sigma distance = 171.2
magDrop report: percentDrop: 98.2  magDrop: 4.361  +/- 0.618  (0.95 ci)

DNR: 9.38

D time: [03:07:02.4506]
D: 0.6800 containment intervals:  {+/- 0.0011} seconds
D: 0.9500 containment intervals:  {+/- 0.0025} seconds
D: 0.9973 containment intervals:  {+/- 0.0047} seconds

R time: [03:07:02.7517]
R: 0.6800 containment intervals:  {+/- 0.0011} seconds
R: 0.9500 containment intervals:  {+/- 0.0025} seconds
R: 0.9973 containment intervals:  {+/- 0.0047} seconds

Duration (R - D): 0.3011 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0016} seconds
Duration: 0.9500 containment intervals:  {+/- 0.0034} seconds
Duration: 0.9973 containment intervals:  {+/- 0.0059} seconds