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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: 2011 JAN 25
   STAR: TYC 1228-00368-1
   ASTEROID: (144) Vibilia

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

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

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 : 17:32:00
    -D : 17:34:12.62      0.03
    -R : 17:34:21.18      0.03
    -E : 17:37:00
    Duration: 8.56s +- 0.04s, centered at 17:34:16.9 UTC

5.TELESCOPE:
   Type: Newtonian
   Aperture: 40cm f/4
   Magnification: -
   Mount: equatorial
   Motor drive: yes

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, TV-AV PCI-TV7130, S-video input,
   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: fair/good, some clouds passing
   Wind: none
   Star image stability: good
   Minor Planet Visible: yes

8. ADDITIONAL COMMENTS
   I captured this positive event from my observatory in automatic and
unattended mode.
I started the recording of the avi files with KIWI OSD time_stamp at 16:03:00UTC (about 1h30min before the event).
KIWI OSD was detached, while the acquiring process continued.
The telescope was directed to the target and focused 20mins before the predicted
event time. (1h30min before, the sky was too bright to acquire the right target
field).
At 18:46:00UTC (more than 1h after the predicted event) the KIWI OSD signal was
reattached. The reset button was pressed and the time information was again
stamped on the frames. Only at that moment the capturing process was stopped.
A total of more than 240'000 frames were aquired.
No dropped and inserted frames were detected.
The post analysis gave a recorded frame rate of 24.999381 frames/sec.
The Disappearance and  Reappearance UTC times were calculated from the frames number information.

During this time I traveled about 30km north with a mobile station equipped with
videocamera and KIWI OSD. Unfortunately clouds came in and no observation from there was possible.