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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: 24 Mar 2014
   STAR: TYC 1933-01727-1
   ASTEROID: (2562) Chaliapin

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 : 19:44:03
    -D : 19:50:41.46    ±0.01
    -R : 19:50:43.86    ±0.01
    -E : 19:55:02

    Duration: 2.40s ±0.02s

5. TELESCOPE
   Type: Schmidt-Cassegrain, Celestron 11-inch
   Aperture: 280mm
   Focal length: 850mm (with focal reducer)
   Magnification: FOV about 27x21arcmin
   Mount: Equatorial
   Motor drive: Yes

6. TIMING & RECORDING
    Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   Sensor/Camera: Videocamera WAT-902H Ultimate, 1/2" Sony CCD-Sensor ICX429ALL
   Videocamera settings: AGC=HI
   Device of recording: Personal computer, Hauppage HVR-1700(PCI), S-video input
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.020s (50 Img/s), CCIR, Lagarith
   Time insertion device: IOTA-VTI, v.1.1.42

7. OBSERVING CONDITIONS
   Atmospheric transparency: good
   Wind: no
   Star image stability: good
   Minor Planet Visible: no

8. ADDITIONAL COMMENTS

-Since the signal of the target is good (star: 9.6magV ; 9.1magR) the individual frames were splitted in their fields.
-Tangra was used to plot the fields-lightcurve.
-Occular v.4.00 was used to extract the D and R times.
-A measured lightdrop of 1.1mag instead of the predicted 7.1magV (7.1magR) was observed.
-The duration of the Disappearance resulted slower than the Reappearance's one.
-The event occured about 28s before the predicted time.
-A lightcurve can be seen here:
http://sposetti.ch/images/stories/Minor_planets/2014_Mar_24_Chaliapin_Sposetti.jpg