A 4.16 second occultation was recorded by Jonathan Bradshaw, using video- OSD technique.

View the updated prediction.

Observers:
  1    J Bradshaw,Samford,QLD,AU            
  2(M) J Broughton,Eagleby, QLD,AU          
  3(M) J Broughton,Reedy Creek, QLD,AU      
  4(P) Prediction  Oct 4

    

Discussion:

The circle above is plotted at the expected 81 km diameter of Leona. With one chord and a contraining observation it is possible to sure that Jonathan was south of the central line of the event as shown. Long term lightcurve data suggests that Leona has a maximum axis ratio of only 1.03 which would if not enough to allow ambiguity.

The figure below shows the Tangra light curve of the occultation as observed by Jonathan.

Observational Data:

Observation details for MP (319) Leona
By Star              UCAC2 33688276
On 2010-10-22  at 12:22:13.0

_______________________________

Observer   Jonathan Bradshaw
Location   Samford,QLD,AU
Longitude  +152:50
Latitude   -27:22
Altitude   80 m
Datum      WGS84
Telescope Newtonian
Aperture   36 cm
Seeing     Steady Clear
Camera Type
Camera Delay 120mS
Timing     GPS - time inserted Video with frame analysis
Disappearance  12:22:10.49
Reappearance   12:22:14.65
Comments: Clear event despite full Moon near by I have subtracted 120ms which is
my estimate of the camera lag, but the margin of error may be as high as +/- 120ms


_______________________________

Observer   John Broughton
Location   Reedy Creek, QLD
Longitude  +153:23
Latitude   -28:06
Altitude   66 m
Datum      WGS84
Telescope Newtonian
Aperture   51 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     other Drift scan

Missed

Comments:

_______________________________

Observer   John Broughton
Location   Eagleby, QLD
Longitude  +153:12
Latitude   -27:41
Altitude   5 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Steady Clear
Camera Type
Camera Delay 340ms
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Watec 120N+ at 8x