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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: 06 FEB 2013
   STAR: 2UCAC 40191357
   ASTEROID: (31) Euphrosyne

2. OBSERVER
   Name: Jacopo NANNINI, Stefano SPOSETTI
   Address: CH-6525 GNOSCA
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   Nearest city: CH-6707 Iragna
   Longitude: 08 58.1411 (E)
   Latitude: 46 20.0405 (N)
   Altitude: 281 m
   (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 : 01:44:11
    -D : 01:45:28.67   ± 0.05s
    -R : 01:45:35.41   ± 0.05s
    -E : 01:48:45

Duration: 6.75s ± 0.10s

5. TELESCOPE:
   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200mm
   Focal length: about 800mm (with focal reducer)
   Field of view: about 26x17arcmin
   Mount: Equatorial
   Motor drive: Yes

6. TIMING & RECORDING
   Timekeeping: KIWI-OSD with GPS Garmin 18 LVC
   Sensor/Camera: Videocamera WAT-120N+, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
   Videocamera settings: Shutter mode SLOW=3, Gain=max , Gamma=OFF
   Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video,
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.160s, CCIR, Huffyuv
   Time insertion: KIWI-OSD

7. OBSERVING CONDITIONS
   Atmospheric transparency: initially fair, then good
   Wind: fair/moderate
   Star image stability: fair/good
   Minor Planet Visible: yes

8. ADDITIONAL COMMENTS

We observed from a mobile station in an open field.
At about -40min we pointed the target (high in SE) under poor sky conditions.
From -30min to -10min the sky was heavily covered. Just a small region in the North was clear.
At -10min the sky begun to clear. At that moment we got a power failure. The RA motor stopped, the computer image disappeared, the KIWI-OSD was off. We lost the target. Frenetic moments.
At -3min we could re-acquire the target and could start to record the event.
Sometimes a moderate wind shaked the telescope and the image of the target suffered.

Tangra was used to plot the lightcurve.
A correction time of -0.110s was applied because of the use of a WAT120N+ in shutter mode SLOW=3.
Occular v.4.00 was used to extract the D and R times.
Also a manual analysis was performed to extract the D and R times and they were consistent with those delivered by Occular.
The whole saved video goes from 01:42:49 to 01:51:20, but only the small portion between the Start and End times was analysed.
A lightcurve can be seen here:
http://sposetti.ch/images/stories/Minor_planets/2013_Feb_6_Euphrosyne_Gnosca_Iragna.png