A 4.16 second occultation was recorded by Brian Loader, using Video OSD technique.
View the updated prediction.
Observers: 1 B Loader,Darfield, NZ 2(P) Prediction, 19 April
The circle above is plotted at the expected 49 km diameter of Petropolitana. With only one chord it is not possible to determine whether Brian was north or south of the central line of the event. However, assuming the updated prediction was approximately correct the close to expected maximum chord of about 45 km would suggest that the chord might lie close to the central portion of the asteroid.
The figure below shows the Tangra light curve of the occultation.
Observation details for MP ( 830 ) Petropolitana By Star TYC 6161-00910-1 On 2012-05-30 at 16:17:30.0 _______________________________ 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 Strong flickering Clear Camera Type WAT120N PAL/CCIR Camera Delay 0.09 Timing GPS - time inserted Video with frame analysis Disappearance 16:17:28.79 Reappearance 16:17:32.95 Comments: Report prepopulated by IOTA Reporting Add-in for OW ver.1.6