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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: 8 OCT 2012
   STAR: 3UC200-115962
   ASTEROID: (792) Metcalfia

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

3. OBSERVING STATION
   Nearest city: CH-6500 Bellinzona
   Longitude: 9d 1m 26.5s (E)
   Latitude: 46d 13m 53.2s (N)
   Altitude: 260m
   (WGS84)

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 : 03:54:26
    -D : 03:54:34.35  (+-0.09)
    -R : 03:54:35.52  (+-0.09)
    -E : 03:54:48
   Duration: 1.16s (+-0.18)
5.TELESCOPE:
   Type: Newtonian
   Aperture: 400mm
   Focal length: 930mm (with focal reducer)
   Magnification: FOV 23x18arcmin
   Mount: equatorial
   Motor drive: yes

6. TIMING & RECORDING
   Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   Sensor/Camera: Videocamera WAT-120N+, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
   Videocamera settings: Shutter mode SLOW=4, Gain=max, Gamma=LO
   Device of recording: Personal computer, Hauppage HVR-1700(PCI), S-video input
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.320s, CCIR, Huffyuv
   Time insertion device: IOTA-VTI, v.1.1.42

7. OBSERVING CONDITIONS
   Atmospheric transparency: bad
   Wind: no
   Star image stability: fair/bad
   Minor Planet Visible: no

8. ADDITIONAL COMMENTS
   Observation under poor sky conditions. The target star was prepointed several minutes before the predicted instant's event, but some clouds prevented the view. The sky cleared ten seconds before the occultation.

Limovie 0.9.29b was used to produce the lightcurve.
A 0.45 gamma reverse correction was applied.
Occular 4.00 was used to sort out the D and R times.
Because of the use of a WAT-120N+ in Shutter mode SLOW=4 (Integration time=0.320s) a correction of -0.190s was performed at the video inserted times.

A lightcurve can be seen here:
http://www.sposetti.ch/images/stories/Minor_planets/2012_Oct_08_Metcalfia.jpg