Note there were two different events on this date for Emanuela. This was for dim Mag 12 star at 11:50 UT

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OCCULTATION OF UCAC2 22105646 BY 576 Emanuela
2013 July 26

A 10.2 second occultation was recorded by Dave Herald, using video OSD technique.

View the updated prediction.

  1    D Herald,Murrumbateman, NSW, AU
  2(P) Prediction, 4 July


Emanuela occultation - 2013 July 26


We have the unusual situation of having a second event for the same object in the same UTC day. In fact just 3 hours appart. The first event had 6 chords and a constrainig miss. It seems reasonable that for this second event that the shape and orientation of the shadow will be similar and that the offset of the prediction line should be similar.
The ellipse above is plotted at same axis ratio and size as the first event but has been rotated to give a good fit to the observed points. With only one chord it is not possible to determine whether Dave was north or south of the central line of the event. However, assuming the updated prediction was approximately correct the longer than expected chord of about 96 km would suggest that the chord might lie close to the central portion of the asteroid. The central chord position is abou 81 km North of the predcted line. Sadly there is no Damit/ISAM/Miriade 3D model to help refine the analysis.

The figure below shows the Occular plot of Tangra analysis of the occultation.

Emanuela occultation - 2013 July 26

Observational Data:

Observation details for MP ( 576 ) Emanuela
By Star              UCAC2 22105646
On 2013-07-26  at 11:50:16.0


Observer   Dave Herald
Location   Murrumbateman, NSW, AU
Longitude  +148:59
Latitude   -34:57
Altitude   594 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Steady Clear
Camera Type  WAT120N+       PAL/CCIR
Camera Delay 0.05
Timing     GPS - time inserted Video with frame analysis
Disappearance  11:50:09.42
Reappearance   11:50:19.62
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.7


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