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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: Alberto OSSOLA
   Address: 6933 Muzzano (Switzerland)
   Email: aossola@bluewin.ch

3. OBSERVING STATION
   Nearest city: CH-6900 Lugano
   Longitude: 8°55'17" E
   Latitude:  45°59'59"N (Swiss topografic card scale 1:25000)
   Altitude: 350 m

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 : 17:33:45
    -D : 17:34:08.74      0.1
    -R : 17:34:19.50      0.05
    -E : 17:35:05
    Duration: 10.76s  +/- 0.15s

5.TELESCOPE:
   Type: Schmidt Cassegrain
   Aperture: 23cm,  f/10
   Magnification: -
   Mount: equatorial
   Motor drive: no, star trail 80s long

6. TIMING & RECORDING
   Time: See comments.
   Camera: DSRL Canon 1000D at 1600 ISO

7. OBSERVING CONDITIONS
   Atmospheric transparency: poor, some clouds passing
   Wind: none
   Star image stability:  good
   Minor Planet Visible: yes

8. ADDITIONAL COMMENTS
   It was my first attempt.
   Exposure on DSLR was manual, with chronograph registered on European Atomic Time few minutes before the event.
   Minor Planet was visible on previous frames of 5s-duration with RA Motor on.