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OCCULTATION OF UCAC4390-109182 BY 589 Croatia
2013 September 18

A 14 second occultation was recorded by Steve Kerr, using video OSD technique.

No clearly observed misses were recorded for this event.

View the TT14 prediction.

  1    S Kerr,Rockhampton,QLD,AU
  2(P) Prediction, TT14 29 Aug


Croatia occultation - 2013 September 18


As Steve's chord was much longer than expected maximum, the ellipse above is plotted with major axis fitting the chord and the minor axis at the size expected for a circular object. Both previous observations had chords of about 86 km. One of these had two greatly differing chords suggested that this was an elongated object.
With only one chord it is not possible to determine whether Steve was north or south of the central line of the event.
However, assuming the prediction was approximately correct the longer than expected chord of about 118 km would suggest that the chord might lie close to the central portion of the asteroid.
It also suggests that Croatia may be a much darker than predicted object with lower albedo.
There are no DAMIT or ISAM 3D models for Croatia yet.

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

Croatia occultation - 2013 September 18

Observational Data:

Observation details for MP ( 589 ) Croatia
By Star              UCAC4 390-109182
On 2013-09-18  at 10:33:14.0


Observer   S. Kerr
Location   Rockhampton,QLD,AU
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 -0.11
Timing     GPS - time inserted Video with frame analysis
Disappearance  10:32:57.39
Reappearance   10:33:11.47
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.7


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