Occultations have been observed by both Jacquie Milner and Dean Hooper across the greater Melbourne area using video OSD technique.
No clearly observed misses were recorded for this event.
View the Personal prediction.
Observers: 1 J Milner,Bayswater, Vic, AU 2 D Hooper,Sunbury, VIC. Australia 3(P) Prediction - IOTA Feed
Inspection of the lightcurves below show an excellent signal to noise ratio and and give good confidence that the events are real. Previous research had concluded a circular equivalent diameter for (824) Anastasia of only 29km. The spacing of these two observations however indicates at least one dimension being significantly greater than this and the possibility of an extremely elongated object. There is only one previous reported occultation by (824) Anastasia across California on 2010 April 6 with four chords observed and a large number of negative observations. That observation also concluded that (824) Anastasia was extremely elongated and of dimensions very close to those derived above for this set of observations (22km X 44km for the 2010 observation). This lends some credibility to the above interpretation.
The figure below shows the Tangra light curve of Jacquie's observation.
The figure below shows the Tangra light curve of Dean's observation with time analysis by AOTA.
Observation details for MP ( 824 ) Anastasia By Star TYC 6283-01387-1 On 2015-07-20 at 10:30:46.0 _______________________________ Observer Jacquie Milner Location Bayswater, Vic, AU Longitude +145:14 Latitude -37:50 Altitude 110 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 20 cm Seeing Steady Clear Camera Type Mintron 12v1C-EX PAL/CCIR Camera Delay Timing GPS - time inserted Video with frame analysis Disappearance 10:30:53.94 Reappearance 10:30:55.14 Comments: Event was approx. 9 sec late and the path shifted southwards over me. Recording is short as another event for (1936) Lugano was happening soon after. Report prepopulated by IOTA Reporting Add-in for OW ver.1.8 _______________________________ Observer Dean Hooper Location Sunbury, VIC. Australia Longitude +144:42 Latitude -37:34 Altitude 252 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 20 cm Seeing Steady Clear Camera Type Watec 910HX PAL/CCIR Camera Delay Timing GPS - time inserted Video with frame analysis Disappearance 10:30:54.87 Reappearance 10:30:56.55 Comments: Light curve generated using Tangra v3.4.8 Times analysed using AOTA v184.108.40.206