Three closely spaced chords were recorded using video technique.
View the updated prediction.
Observers: 1 D Gault,Hawkesbury Heights,NSW,AU 2 T Barry,Werrington County, NSW,AU 3 H Pavlov,St Clair, NSW, Australia 4(P) Prediction, 31 March
The circle above is plotted at the expected 44 km diameter of Aethera. With only these chords so close together it is not possible to determine whether they are north or south of the central line of the event. With the ISAM 3D model overlaid on the plot at about the same area we can see two options that fit the observations.
It would apear the the left hand plot is a slightly better fit but the difference is too small to be certain so the astrometic result will be the centre.
The figure below shows Dave's Tangra light curve of the occultation.
The figure below shows Hristo's Tangra light curve of the occultation.
Given the low magnitude (M12.42) and very short duration the agreement of these chords is remarkable.
Observation details for MP ( 132 ) Aethra By Star UCAC2 15762481 On 2012-05-17 at 14:24:29.0 _______________________________ Observer Dave Gault Location Hawkesbury Heights Longitude +150:38 Latitude -33:39 Altitude 286 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 30 cm Seeing Steady Clear Camera Type WAT120N PAL/CCIR Camera Delay 0.09 Timing GPS - time inserted Video with frame analysis Disappearance 14:24:29.87 Reappearance 14:24:31.31 Comments: Report prepopulated by IOTA Reporting Add-in for OW ver.1.6 _______________________________ Observer Hristo Pavlov Location St Clair, NSW, Australia Longitude +150:46 Latitude -33:48 Altitude 68 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 35 cm Seeing Steady Fog Camera Type Other integrating Other Camera Delay 0 Timing GPS - time inserted Video with frame analysis Disappearance 14:24:28.03 Reappearance 14:24:29.90 Comments: http://www.hristopavlov.net/Observations/Positives/2012-05-18%20Aethra/Event.html Report prepopulated by IOTA Reporting Add-in for OW ver.1.6 _______________________________ Observer Tony Barry Location Werrington County NSW Longitude +150:43 Latitude -33:44 Altitude 37 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 25 cm Seeing Slight flickering Clear Camera Type G-Star PAL/CCIR Camera Delay 0.09 Timing GPS - time inserted Visual, PE applied Disappearance 14:24:28.99 Reappearance 14:24:30.45 Comments: Couldn't get OW to prepare the report. This was done manually on a cloned XL sheet