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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: 11 AUG 2011 
   STAR: TYC 2224-01391-1
   ASTEROID: (4709) Ennomos

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 : 20:02:50
    -D : 20:03:07.86     +- 0.01
    -R : 20:03:14:22     +- 0.02
    -E : 20:07:00
    Duration: 6.36s +- 0.03s

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 (25 Img/s), CCIR, Huffyuv
   Time insertion: KIWI-OSD

7. OBSERVING CONDITIONS
   Atmospheric transparency: Fair/Good
   Wind: None
   Star image stability: Good
   Minor Planet Visible: No

8. ADDITIONAL COMMENTS
   The event with this 9.2magV star was placed favorably. The target was at 30deg above horizon.
The pointing was done about 1h before the event and was easy. Some clouds covered the sky but cleared about 30s before the occultation.
I could observe the event simultaneously with a Newton 40cm f/4 placed 2 meters apart, in the observatory. This second instrument was equipped with a 902H Supreme video camera and a IOTA-VTI time inserter. Both setups delivered the same occultation results.
The Gnosca observatory was about 10km outside the south prediction line.

A 19MB movie of the event is visible here:
http://aida.astroinfo.org/displayimage.php?pid=5218
A lightcurve is here:
http://www.sposetti.ch/images/stories/News/Ennomos_Sposetti_11Aug2011_telescope1.JPG

   Tangra and Limovie software were used to analyze the AVI files.