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

        

Discussion:

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.

Observational Data:

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