A 15.6 second occultation was recorded by Steve Russell, using video-OSD technique.

Two clearly observed misses were recorded for this event.

View the updated prediction.

Observers:
  1(M) B Loader,Darfield, NZ
  2(M) D Herald,Murrumbateman, NSW,AU
  3    S Russell,Medway, NSW,AU
  4(P) Prediction, TT14 May 29

    

Discussion:

The circle above is plotted at the expected 140 km diameter of Sibylla. With only one chord and a constraining miss we can be confident of the path of Sibylla and that it was south of the predicted line.

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

Observational Data:

Observation details for MP (168) Sibylla
By Star              UCAC2 26011813
On 2011-06-27  at 08:53:15.0

_______________________________

Observer   B. Loader
Location   Darfield, NZ
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
Camera Delay
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Watec 120N camera at 16x integration.
Report prepopulated by IOTA Reporting Add-in for OW ver.1.5

_______________________________

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   35 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.5

_______________________________

Observer   Stephen Russell
Location   Medway, NSW,AU
Longitude  +150:17
Latitude   -34:29
Altitude   663 m
Datum      WGS84
Telescope Newtonian
Aperture   20 cm
Seeing     Slight flickering Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.17
Timing     GPS - time inserted Video with frame analysis
Disappearance  08:56:24.64
Reappearance   08:56:40.28
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.5