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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: 01 Apr 2011 
   STAR: TYC 1343-01414-1
   ASTEROID:(554)Peraga

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 : 18:40:30
    -D : 18:50:42.881     ± 0.01s
    -R : 18:50:48.272     ± 0.01s
    -E : 18:58:00
   Duration 5.39s ± 0.02s

5. TELESCOPE
   Type: Schmidt-Cassegrain, Celestron 11-inch
   Aperture: 280mm
   Focal length: 930mm (with focal reducer Optec 0.33X)
   Magnification: FOV 23x18arcmin
   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=LO , 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/frame, CCIR, Huffyuv
   Time insertion: KIWI-OSD

7. OBSERVING CONDITIONS
   Atmospheric transparency: good
   Wind: none
   Star image stability: good
   Minor Planet Visible: no

8. ADDITIONAL COMMENTS

   Virtualdub was used to deinterlace the frames in two fields and to analyse the timings.
   Tangra was used to plot the intensity of light versus time and to isolate the light drop.
   The residual light of the asteroid (13.3mag) is barey detectable above the background.
   A still image is here:
http://sposetti.ch/images/stories/Minor_planets/Peraga_01apr2011_Sposetti_2.png
   An avi movie is here:
http://aida.astroinfo.org/displayimage.php?pid=5088