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Three well spaced chords were measured, using video OSD technique for this event.
View the updated prediction.
Observers:
1 C Chad,Gunnedah, NSW
2 J Broughton,Brunswick Heads, NSW, AU
3 J Broughton,Reedy Creek, QLD, AU
4(P) Prediction, 6 June
Discussion:
The ellipse above is 191km x 188 km compared to the expected the expected 218 km diameter of Aurora.
The ISAM 3D model has been overlaid on the circle and shows good fit.
With 3 chords we can be confident of the path of Aurora and that it was
south of the predicted line.
The figure below shows Chris' Tangra light curve of the occultation.
Observational Data:
Observation details for MP ( 94 ) Aurora
By Star TYC 7430-00743-1
On 2012-06-23 at 18:23:36.0
_______________________________
Observer Chris Chad
Location Gunnedah, NSW
Longitude +150:15
Latitude -30:59
Altitude 315 m
Datum WGS84
Telescope Newtonian
Aperture 25 cm
Seeing Slight flickering Clear
Camera Type Other integrating NTSC/EIA
Camera Delay 0.05
Timing GPS - time inserted Video with frame analysis
Disappearance 18:23:19.15
Reappearance 18:23:34.65
Comments: Samsung SCB-2000 NTSC (modded) 34ms subtracted from times
(camera delays sending frame for one frame)
Very frosty with light fog haze.
Very clear event.
_______________________________
Observer John Broughton
Location Reedy Creek, QLD, AU
Longitude +153:23
Latitude -28:06
Altitude 66 m
Datum WGS84
Telescope SCT including Cass and Mak
Aperture 25 cm
Seeing Slight flickering Clear
Camera Type WAT120N PAL/CCIR
Camera Delay 0.05
Timing GPS - time inserted Video with frame analysis
Disappearance 18:22:51.08
Reappearance 18:23:01.88
Comments:
_______________________________
Observer John Broughton
Location Brunswick Heads, NSW, AU
Longitude +153:32
Latitude -28:33
Altitude 7 m
Datum WGS84
Telescope Newtonian
Aperture 32 cm
Seeing Slight flickering Clear
Camera Type WAT120N PAL/CCIR
Camera Delay 0.05
Timing GPS - other linking Video with frame analysis
Disappearance 18:22:50.93
Reappearance 18:23:05.41
Comments: