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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: 23 NOV 2012 
   STAR: TYC 0858-00346-1
   ASTEROID: (1071) Brita

2. OBSERVERS
   Name: S. CHIANESE, A.KUHN, J. NANNINI, S. SPOSETTI
   Address: CH-6525 GNOSCA
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   Nearest city: CH-6721 Motto
   Longitude: 8° 58.2969' E
   Latitude: 46° 25.7057' N
   Altitude: 460m
   (WGS84)

4. TIMING OF EVENTS
   Occultation recorded: NEGATIVE
   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 : 05:04:21
    -D :
    -R :
    -E : 05:05:35

5.TELESCOPE
   Type: Schmidt-Cassegrain
   Aperture: 200mm
   Focal length: 1000mm (with focal reducer)
   Magnification: FOV 24x18arcmin
   Mount: equatorial
   Motor drive: no

6. TIMING & RECORDING
   Timekeeping: KIWI-OSD with GPS Garmin 18 LVC
   Sensor/Camera: Videocamera WAT-902H Ultimate, 1/2" Sony CCD-Sensor ICX429ALL
   Videocamera settings: Gain=HI , Gamma=LO
   Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video,
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.04s (25 Img/s), CCIR, Huffyuv
   Time insertion: KIWI-OSD

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

8. ADDITIONAL COMMENTS
Software Tangra was used to analyze the AVI file.

The telescope was pre-pointed to the target position about 1hour before the scheduled event time. The sky was clear during the preparation and all night long.

Accordingly to Occultwatcher our position was 0.2km from the central line and had 46% probability of a positive event.