A 2.9 second occultation was recorded by Jonathan Bradshaw using video OSD technique, and a 2.6 second one by Peter Anderson using visual observing technique.
View the updated prediction.
Observers: 1 J Bradshaw,ord Valley, Qld, Australia 2 P Anderson,THE GAP,Brisbane,QLD,AU 3(P) Prediction, 4 July
The circle above is plotted at the expected 46 km diameter of Aethra. With 2 chords and the fact that Jonathan's was longer that the expected 2.8 seconds, and assuming the updated prediction was approximately correct the longer than expected chord of about 44km would suggest that the chord might lie close to the central portion of the asteroid. With 2chords we can be confident of the path of Aethra and that it was north of the predicted line. The ISAM 3D model has been overlaid on the measured ellipse and shows poor fit
The figure below shows Jonathan's Limovie light curve of the occultation.
Observation details for MP ( 132 ) Aethra By Star TYC 1094-01128-1 On 2013-07-08 at 19:47:13.0 _______________________________ Observer Jonathan Bradshaw Location Samford Valley, Qld, Australia Longitude +152:50 Latitude -27:22 Altitude 80 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 36 cm Seeing Slight flickering Clear Camera Type G-Star PAL/CCIR Camera Delay 0 Timing GPS - time inserted Video with frame analysis Disappearance 19:47:15.85 Reappearance 19:47:18.75 Comments: Nice clear event at 3 frame integration to mitigate poor seeing http://youtu.be/jItLJWL5WOQ _______________________________ Observer Peter Anderson Location THE GAP,Brisbane,QLD,AU Longitude +152:55 Latitude -27:27 Altitude 170 m Datum WGS84 Telescope Newtonian Aperture 41 cm Seeing Steady Clear Camera Type Visual Camera Delay 0 Timing Tape Recorder + time signal Visual, PE applied Disappearance 19:47:15.90 Reappearance 19:47:18.50 Comments: Observation in twilight but star easily visible. No wind or distractions. A very satisfactory observation. Star disappeared at occultation (asteroid never seen)