A 28.9 second occultation was recorded by Jonathan Bradshaw, using Video OSD technique.

Two clearly observed misses were recorded for this event.

View the updated prediction.

Observers:
  1    J Bradshaw,Samford Valley, Qld, AU
  2(M) J Broughton,Reedy Creek, QLD, AU
  3(M) S Kerr,Rockhampton,QLD,AU
  4(P) Prediction27 Jan

        

Discussion:

The circle above is plotted at the expected 158 km diameter of Wratislavia. With only one chord and John Broughton's nearby constraining miss we can be sure that Jonathan was East of the central line of the event. The ISAM 3D model has been overlaid on the measured circle but with only one chord we cannot be sure of the relative scale.
June 2013 Updated. Following another Wratislavia occultation which also gave abiguity it was noted that there was a second positive for this event observed by M Owada, Hamamatsu, Shizuoka, Japan.

The updated observer list is now:

  1    J Bradshaw,Samford Valley, Qld, AU
  2(M) J Broughton,Reedy Creek, QLD, AU
  3(M) S Kerr,Rockhampton,QLD,AU
  4(P) Prediction27 Jan
  5    M Owada, Hamamatsu, Shizuoka, Japan  
  6(M) R Aikawa, Sakado, Saitama, Japan

Model 2

The extra chord resolves the amibuity in favour of model #2 with the NE-SW spin. This is noted in the 2013 March 11 event write up for the same object.

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

Observational Data:

Observation details for MP ( 690 ) Wratislavia
By Star              TYC 6133-00477-1
On 2013-02-11  at 15:33:40.0

_______________________________

Observer   Jonathan Bradshaw
Location   Samford Valley, Qld, AU
Longitude  +152:50
Latitude   -27:22
Altitude   80 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   36 cm
Seeing     Steady Clear
Camera Type  G-Star         PAL/CCIR
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis
Disappearance  15:33:08.55
Reappearance   15:33:37.43
Comments: Perfect Conditions, and a nice gentle curve seen on D and R.
Report prepopulated by IOTA Reporting Add-in for OW ver.1.7

_______________________________

Observer   John Broughton
Location   Reedy Creek, QLD, AU
Longitude  +153:23
Latitude   -28:06
Altitude   66 m
Datum      WGS84
Telescope Newtonian
Aperture   32 cm
Seeing     Slight flickering Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.03
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:

_______________________________

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 0.05
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.7