A 10.01 second occultation was recorded by John Broughton, Reedy Creek, QLD, Australia, using CCD drift field technique.

View the updated prediction.

Observers:
  1    John Broughton, Reedy Creek, QLD, Australia
  2    Diana Watson, Whakatane, NZ

Discussion:

The circle above is plotted at the expected 83km diameter of Klotho. With only one chord it is not possible to determine whether John was north or south of the central line of the event. However, assuming the updated prediction was approximately correct would suggest that the chord might lie close to the central portion of the asteroid.

The figures below show the drift-scan image of the occultation together and the data as analysed by John's Scanalyser software.

Observational Data:

J Broughton:
TELESCOPE DETAILS:
Aperture (cm)                    : 51
Focal length (cm)                : 138
Type (e.g. SCT; Newtonian)       : F/2.7 Astrograph 
Magnification                    : CCD drift-scan at 4.2 pps, 60'FOV 
Observing site name              : Reedy Creek, Gold Coast
Longitude (East +ve)             : +153 23' 49"
Latitude (South -ve)             : -28 06' 36"
Height above Sealevel (metres)   : 66
Geodetic Datum (e.g.WDD84,NZ1949): AGD66
Sky Transparency (Delete two)    : Poor
Star Image Stability (Delete two): Good
Other Conditions:                  
     (Wind, Clouds, Lights, etc.): High altitude semi-transparent cloud.
                              
TIMINGS:  (PLEASE REPORT IN UNIVERSAL TIME)
Time Source (e.g. WWV, VNG)      : WWVH.
Recording method (e.g. tape)     : Tape.  
Could you see the Asteroid?      : Only combined light monitored.
Approx. Limiting Magnitude       : 12.5 during the occultation.
                                          | Estimated  |
                           Universal Time | Reaction   | Accuracy, Remarks
                              h  m  s     | Time (sec) | 
   COLUMN FORMAT TO USE--->  __:__:__._        _._       _________________)
Started Observing          : 09:28:47.44       n/a       0.01
Disappearance At           : 09:28:57.73       n/a       0.16
Reappearance At            : 09:29:07.74       n/a       0.16
Stopped Observing          : 09:29:17.70       n/a       0.01
Duration                   :       10.01    

ADDITIONAL COMMENTS:  
Rigorously timed CCD drift-scan measured in Scanalyzer:
http://www.users.bigpond.com/reedycrk/driftscantiming.htm

Another occultation with reduced limiting magnitude and overall timing
accuracy due to high-altitude cloud.

--------------------------------------------------------------------------------

D Watson
TELESCOPE DETAILS:
Aperture (cm)                    : 20
Focal length (cm)                : 200
Type (e.g. SCT; Newtonian)       : Celestron 8
Magnification                    : 115 times
Observing site name              : Whakatane
Longitude (DD MM SS ; East +ve)  : 176 51 50.7
Latitude (DD MM SS ; South -ve)  : -37 55 18.5
Height above Sealevel (metres)   : 2.8 metres
Geodetic Datum (e.g.WGS84,NZ1949): WGS84
Height Datum (if known)          : 

Sky Transparency (Delete two)    : Fair    
Star Image Stability (Delete two): Good  
Other Conditions:  
     (Wind, Clouds, Lights, etc.): moisture disturbance of the air


Time Source (e.g. WWVH, GPS)     : WWVH
Recording method (e.g. tape)     : tape recorder
Could you see the Asteroid?      : Yes
Approx. Limiting Magnitude       : 13
                                          | Estimated  |
                           Universal Time | Reaction   | Accuracy, Remarks
                              h  m  s     | Time (sec) | 
Started Observing          : 09:26:00.0
Star and Object Merged     : 09:24:00.0    By this minute
Disappearance At           : 
Estimated Closest Approach : 
                (if no D/R)
Reappearance At            :    
Star and Object Separated  : 09:42:00.0    By this minute 
Stopped Observing          : 09:42:00.0    

ADDITIONAL COMMENTS: 

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