A 1 second occultation was recorded by Brian Loader, using an SCT Telescope and Watec 910BD camera.

There was no updated prediction for this event.

Observers:
  1    B Loader, Darfield, Canterbury, New Zealand

       

Discussion:

The circle above is plotted at the expected diameter of Cambridge. With only one chord, it is not possible to tell if Brian was north or south of the centre line of the event. The model has been plotted centred on the observed chord.

Because of the significant difference between the predicted and observed times (see below) it may be questioned whether the correct event was recorded.

The figure below shows the Tangra light curve of the occultation.

Name:

Observational Data:

Observation details for MP ( 2531 ) Cambridge
By Star              UCAC4 337-203362
On 2017-09-01  at 17:53:39.0

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Observer   B. Loader
Location   Darfield
Longitude  +172:06
Latitude   -43:28
Altitude   210 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Slight flickering Clear 
Camera Type  Watec 910BD    AAV-PAL       
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  17:54:10.49
Reappearance   17:54:11.77
Comments: GAIA prediction: combined mag 12.9, expected d mag 2.6.
 Event T max 1.8 sec, Pred time error 5s,  Prob of event 13%, Darfield at 0.4 sigma The light curve
shows a clear event, ca 3.5 integrated frames and the correct sort of depth.
  BUT it is ca 32 seconds late ca 6x predicted error.
    KIWI-OSD reported no time error by re-boot after observation run.