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                ASTERIODAL OCCULTATION - REPORT FORM

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                      EAON & IOTA-ES

              EUROPEAN ASTEROIDAL OCCULTATION NETWORK

   INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION

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1. DATE: 26 MAR 2012 
   STAR: 3UC142-236470
   ASTEROID: (712) Boliviana

2. OBSERVER
   Name: Stefano SPOSETTI
   Address: 6525 GNOSCA - Switzerland
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   Nearest city: CH-6500 Bellinzona
   Longitude: 9d 1m 26.5s (E)
   Latitude: 46d 13m 53.2s (N)
   Altitude: 260m
   (WGS84)

4. TIMING OF EVENTS
   Occultation recorded: POSITIVE
   Type of event:
   "S"tart observation;
   "I"nterrupt-start;
   "D"isappearance;
   "B"link;
   "F"lash;
   "E"nd observation;
   "I"nterrupt-end;
   "R"eappearance;
   "O"ther (specify)

   Personal Equation Substracted: No
   Event Time (UTC)       Accuracy + Comments
   code: HH:MM:SS.ss      S.ss
    -S : 03:33:39
    -D : 03:33:54.65 ± 0.04
    -R : 03:33:59.09 ± 0.04
    -E : 03:35:22
    Duration: 4.44s ± 0.07

5.TELESCOPE:
   Type: Newtonian
   Aperture: 400mm
   Focal length: 930mm (with focal reducer)
   Magnification: FOV 23x18arcmin
   Mount: equatorial
   Motor drive: no

6. TIMING & RECORDING
   Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   Sensor/Camera: Videocamera WAT-120N+, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
   Videocamera settings: Shutter mode=3, Gain=max , Gamma=OFF
   Device of recording: Personal computer, Hauppage HVR-1700(PCI), S-video input
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.160s, CCIR, Huffyuv
   Time insertion device: IOTA-VTI, v.1.1.42

7. OBSERVING CONDITIONS
   Atmospheric transparency: fair/good
   Wind: no
   Star image stability: good
   Minor Planet Visible: no

8. ADDITIONAL COMMENTS
   Automatic observation. The telescope was pre-pointed to the target position.
   Limovie 0.9.29b was used to produce the lightcurve.
   Occular v4.00 was used to analyze the D and R times.
   Because of the use of a WAT-120N+ in shutter mode 3 (Integration time=0.160s) a correction of -0.110s was performed at the video inserted times in accordance with the correction value table published by G. Dangl.