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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: 6 JAN 2013
   STAR: TYC 1856-00745-1
   ASTEROID: (87) Sylvia

2. OBSERVER
   Name: S. SPOSETTI, A. MANNA
   Address: CH-6525 GNOSCA
   Email: stefanosposetti@ticino.com, andreamanna@sunrise.ch

3. OBSERVING STATION
   Nearest city: I-Condove
   Longitude: 07 18 01.3 E
   Latitude: 45 07 34.1 N
   Altitude: 585m
   (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 : 01:34:14
    -D : 01:37:26.21  +- 0.03
    -R : 01:37:51.55  +- 0.04
    -E : 01:41:11
    Duration: 25.34s +- 0.06s

5.TELESCOPE:
   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200mm
   Focal length: 800mm (with focal reducer)
   Magnification: FOV 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=1, Gain=max , Gamma=LO
   Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video,
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.040s, CCIR, Huffyuv
   Time insertion: KIWI-OSD

7. OBSERVING CONDITIONS
   Atmospheric transparency: good
   Wind: no
   Star image stability: good
   Minor Planet Visible: yes, before and during the occultation

8. ADDITIONAL COMMENTS
We traveled by car from Gnosca(CH) to Condove(I) under poor skies searching for good conditions.
Clear sky was found in the little town of Condove. There we could place our equipment setup. Target was high in SW.
Temperature +10°C. Just some minutes before the occultation a slight telescope shake occured because of wind. During the all monitoring the images were steady. The seeing was good.

Tangra software was used to plot the lightcurve.
A reverse gamma correction of 0.45 was applied.

A -0.050s correction was applied to the central times of D and R showed by KIWI-OSD ("Dangl correction").

From the lightcurve we can see that R was a bit longer than D.

Recording started at 01:08:52UT and ended at 01:45:18UT but no analysis was performed outside the reported S and E times.

A lightcurve can be seen here:
http://sposetti.ch/images/stories/Minor_planets/2013_1_6_Sylvia_Sposetti_Manna.png