A 7.65 second occultation was recorded by Dave Gault, using video OSD technique.

View the updated prediction.

Observers:
  1    D Gault,Hawkesbury Heights,NSW,AU
  2(P) Prediction 27 Dec


    

Discussion:

The circle above is plotted at the expected 89 km diameter of Apollonia. 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 93km would suggest that the chord might lie close to the central portion of the asteroid.
Dave notes that both D and R were slow but as he used x16 frame integration it is not possible to consider double star options with confidence but the apparantly near central chord tends to exclude grazing effects.

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

Observational Data:

Observation details for MP (358) Apollonia
By Star              TYC 0831-01217-1
On 2010-02-18  at 13:04:53.0

_______________________________

Observer   Dave Gault
Location   Hawkesbury Heights,NSW,AU
Longitude  +150:38:28.
Latitude   -33:39:52.
Altitude   286 m
Datum      WGS84
Telescope Newtonian
Aperture   25 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  13:04:54.84
Reappearance   13:05:02.49
Comments: 16 frame stack
D took ~ 1sec - R took 1/2 sec
Report prepopulated by IOTA Reporting Add-in for OW ver.1.4