Four chords were recorded using video OSD technique.

One clearly observed miss was recorded for this event.

View the updated prediction.

Observers:
   1   Rob Horvat et al, Linden Obs, NSW,AU 
  2    P Nosworthy,Leura, NSW, Australia    
  3    D Gault,Kuriwa Observatory, NSW, AU  
  4(M) D Herald,Murrumbateman, NSW, AU      
  5    L Davis,Linden Observatory, NSW,AU   
  6(P) Prediction, May 18                   



        

Discussion:

The circle above is plotted at the expected 269 km diameter of Bertholda. With 4 chords we can be confident of the path of Bertholda and that it was close to the predicted line. With the chord so close together we cannot get a better size estimate.

The figure below shows the Tangra light curve of the occultation.

Observational Data:

Observation details for MP ( 420 ) Bertholda
By Star              TYC 6284-01716-1 
On 2015-06-19  at 14:33:56.0

_______________________________

Observer   Rob Horvat,  Tony Barry, Lachlan Davis
Location   Linden Observatory, Blue Mountains
Longitude  +150:29
Latitude   -33:42
Altitude   593 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Steady Clear 
Camera Type  Flea3-03S3 with ADVS         ADVS          
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  14:33:57.17
Reappearance   14:34:08.10
Comments: Observed from Linden Obs, not as reported on OW at Werrington 
Lachlan Davis will be submitting a separate report, he also observed from Linden
 but using different equipment. 
Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   Peter Nosworthy
Location   Leura, NSW, Australia
Longitude  +150:20
Latitude   -33:43
Altitude   903 m
Datum      WGS84
Telescope Dobsonian
Aperture   30 cm
Seeing     Steady Clear 
Camera Type  Visual         Other         
Camera Delay 
Timing     Tape Recorder + time signal Visual, PE applied
Disappearance  14:33:59.08
Reappearance   14:34:09.26
Comments:     

_______________________________

Observer   Dave Gault
Location   Kuriwa Observatory, NSW, AU
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  Flea 3-03S3 with ADVS        ADVS          
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  14:33:56.71
Reappearance   14:34:07.11
Comments:    

_______________________________

Observer   Dave Herald
Location   Murrumbateman, NSW, AU
Longitude  +148:59
Latitude   -34:57
Altitude   594 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Steady Clear 
Camera Type  Watec 120N+    NTSC/EIA      
Camera Delay 
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:  Lightcurve from 00:00:00 to 14:35:09 by Tangra v3.4.8 using AperturePhotometry/AverageBackground.
 Analysis by AOTA v4.1.5.6. 
Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   Lachlan Davis
Location   Linden Observatory, NSW,AU
Longitude  +150:29
Latitude   -33:42
Altitude   593 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear 
Camera Type  WAT910BD       PAL/CCIR      
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  14:33:56.88
Reappearance   14:34:08.04
Comments: light curve plot.png and .csv file submitted with this report.