Three chords were recorded using video OSD technique. Two were from USA and one from Queensland. A rare transpacific success.

View the updated prediction.

Observers:
  1    S Kerr,Rockhampton, Australia
  2    R Jones,Running Springs, CA
  3    S Messner,Northfield, MN
  4(P) Predicted Centerline w/Time


        

Discussion:

The ellipse above is plotted at the best fit axis ratio as determined by Occult. With 3 chords we can be confident of the path of Adelheid and that it was close to the predicted line. The ISAM 3D model has been overlaid on the measured ellipse and shows reasonable fit for the outer chords but the inner one is much shorter than the 3D model. It is well known that the current 3D inversion process always results in convex shapes so it is possible that the centre chord is indictaing deep craters on each side. We have also considerd the possible change in projected shape between the USA and AU observers as Adelheid spins, but there is only a small change in the apoximately 12 minutes that it takes the shadow to cross the Pacific Ocean.

The figure below shows Steve Kerr's Tangra light curve of the occultation.

The figure below shows Jones's Tangra light curve of the occultation.

As there are 2 USA observers and 1 RASNZ Occsec observer this event will be credited to North America region. See Here

Observational Data:

Observation details for MP ( 276 ) Adelheid
By Star              TYC 0100-01306-1
On 2012-11-21  at 10:42:34.0

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Observer   S. Kerr
Location   Rockhampton
Longitude  +150:30
Latitude   -23:16
Altitude   50 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   30 cm
Seeing     Slight flickering Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.17
Timing     GPS - time inserted Video with frame analysis
Disappearance  10:42:33.61
Reappearance   10:42:36.53
Comments: Low altitude.  Report prepopulated by IOTA Reporting Add-in for OW ver.1.6