A 6.2 second occultation was recorded by Steve Kerr, using video OSD technique.

View the TT14 prediction.

Observers:
  1    S Kerr,Glenlee, Queensland,AU
  2(P) Prediction TT14  31 July

    

Discussion:

The circle above is plotted at the expected 87 km diameter of Gratia. 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 updated prediction was approximately correct the chord of about 76km would suggest that the chord might lie within about 25 km of the central portion of the asteroid.

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

Observational Data:

Observation details for MP (424) Gratia
By Star              UCAC2 21661195
On 2010-08-07  at 10:49:35.0

_______________________________

Observer   Stephen Kerr
Location   Glenlee, Queensland,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   Integrating
Camera Delay 100 ms
Timing     GPS - time inserted Video with frame analysis
Disappearance  10:49:55.29
Reappearance   10:50:01.53
Comments: Video camera integrating at 160 msec.