A 9.64 second occultation was recorded by Patrick Purcell, using video OSD technique.

View the updated prediction.

Observers:
  1(M) D Herald,Kambah,ACT,AU
  2    P Purcell,Nimmitabel,NSW, AU
  3(P) Prediction 5 April
    

Discussion:

The circle above is plotted at the expected 143 km diameter of Isolda. With only one chord it is not possible to determine whether Patrick was north or south of the central line of the event.
There is a hint of a possible double star in the D of light curve below but, with only 3 points in the step this could equally be noise consistent with the lead in, and would need additional chords to confirm.

The figures below shows the Limovie lightcurve of the occultation.

Observational Data:

Observation details for MP (211) Isolda
By Star              TYC 6137-00866-1
On 2009-05-13  at 16:50:25.0

_______________________________

Observer   Dave Herald
Location   Kambah
Longitude  +149:03:48.9
Latitude   -35:23:49.3
Altitude   583 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   35 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:

_______________________________

Observer   Patrick Purcell
Location   Nimmitabel
Longitude  +149:17:39.7
Latitude   -36:35:9.7
Altitude   1051 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Slight flickering Clear
Timing     GPS - time inserted Video, photo or photoelectric
Disappearance  16:50:26.54
Reappearance   16:50:36.18
Comments: