|
A 9.31 second occultation was recorded by Bill Allen, using the drift scan technique.
View the updated prediction.
Observers: 1 B Allen,Blenheim, NZ 2(M) D Watson,Thornton near Whakatane, NZ 3(P) Prediction 19 Dec
Discussion:
The circle above is plotted at the expected 183 km diameter of Freia. With only one chord it is not possible to determine whether Bill was north or south of the central line of the event. However, assuming the updated prediction was approximately correct the shorter than expected maximum chord of about 100 km would suggest that the chord might lie about +/- 80km from central portion of the asteroid.
The figures below shows the drift-scan image of the occultation.
Observational Data:
Observation details for MP (76) Freia By Star TYC 1320-00481-1 On 2008-01-03 at 10:38:20.0 _______________________________ Observer Bill Allen Location Blenheim, NZ Longitude +173:50:21.4 Latitude -41:29:30. Altitude 38 m Datum WGS84 Telelscope SCT including Cass and Mak Apperture 40 cm Seeing Steady Thin cloud < 2 Timing Tape Recorder + time signal Drift scan Disappearance 10:38:13.04 Reappearance 10:38:22.35 Comments: The timing tapes were analysed with Goldwave. Poor observing conditions but the drift scan image was acceptable. Results were checked by John Drummond _______________________________ Observer Diana Watson Location Thornton near Whakatane Longitude +176:51:50. Latitude -37:55:51. Altitude 3 m Datum Other Telelscope SCT including Cass and Mak Apperture 20 cm Seeing Steady Clear Timing Tape Recorder + time signal Visual, no PE applied Missed Comments: some moisture disturbance of the stars