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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: 9 Mar 2015
   STAR: 4UC382-077757
   ASTEROID: (51) Nemausa

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

3. OBSERVING STATION
   Nearest city: CH-6525 Gnosca
   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 : 01:56:06
    -D : 02:06:07.43 ± 0.32 s
    -R : 02:06:14.47 ± 0.64 s
    -E : 02:10:05

    duration:  7.04 s ± 0.96 s

TELESCOPE
   Type: Schmidt-Cassegrain, Celestron 11-inch
   Aperture: 280mm
   Focal length: about 900mm (with focal reducer)
   Magnification: FOV 23x18arcmin
   Mount: Equatorial
   Motor drive: Yes

6. TIMING & RECORDING
   Timekeeping: KIWI-OSD with GPS Garmin 18 LVC
   Sensor/Camera: Videocamera WAT-910HX, CCIR, 1/2", ICX429ALL sensor
   Videocamera settings: Shutter=x32; Gain=medium; Gamma=1.00
   Personal computer, Imaging Source DFG/SV1 PCI, S-video, CCIR, Virtualdub software, saved on Harddisk, Lagarith
   Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   Time insertion device: IOTA-VTI, v.1.1.42
   Integration time: 0.640s

7. OBSERVING CONDITIONS
   Atmospheric transparency: bad, with thin clouds and Moonlight
   Wind: no
   Star image stability: good-fair
   Minor Planet Visible: yes

8. ADDITIONAL COMMENTS

-Tangra v.3 software was used to produce the lightcurve.
-A correction of -0.340 s was performed because of the use of an integrating camera.
-During pre D and post R the signal of the star is saturated, but not during the event.
-Accordingly the lightcurve, the D is quite evident and sharp. The R was slower and less evident.
-A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2014/09/2015_Mar_9_Nemausa_Sposetti.png