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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: 3 AUG 2013 
   STAR: 4UC 319-088789
   ASTEROID: (407) Arachne

2. OBSERVER
   Name: L. PACCIORINI, S. SPOSETTI
   Address: 6525 GNOSCA - Switzerland
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   Nearest city: CH-6776 Piotta
   Longitude: 8d 42.0492m (E)
   Latitude: 46d 32.7640m (N)
   Altitude: 1917m
   (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 : 20:15:49
    -D : 20:20:09.66     ± 0.32s
    -R : 20:20:32:77     ± 0.32s
    -E : 20:25:02
   Duration: 23.10s ± 0.64s

5. TELESCOPE
   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200mm
   Focal length: about 800mm (with 0.33x focal reducer)
   Field of view: about 26x17arcmin
   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 6, Gain=max , Gamma=OFF
   Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, Composite-video,
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=1.28s, CCIR, Huffyuv
   Time insertion device: IOTA-VTI, v.1.1.42

7. OBSERVING CONDITIONS
   Atmospheric transparency: good
   Wind: fair
   Star image stability: fair
   Minor Planet Visible: yes

8. ADDITIONAL COMMENTS
Elevation of the target star: about 16deg.
Tangra 1.4 and Occular 4.00 were used to analyze the lightcurve.
A correction of -0.67s was used because of the use of the integration camera Watec 120N+.
A measured lightdrop of 0.64mag instead of a predicted 0.55mag was found.
A lightcurve is here:
http://www.sposetti.ch/images/stories/News/2013_AUG_3_Arachne.png