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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 2014
   STAR: TYC 2406-00962-1
   ASTEROID: (120) Lachesis

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 : 00:51:32
    -D : 01:01:19.44 ± 0.04
    -R : 01:01:37.78 ± 0.04
    -E : 01:06:12

Duration: 18.34 s ± 0.08 s

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-910HX, CCIR, 1/2", ICX429ALL sensor
   Videocamera settings: Shutter=x4; Gain=39dB; Gamma=1.00
   Device of recording: Personal computer, Imaging Source DFG/SV1 PCI, S-video,
   Virtualdub software, saved on Harddisk
   Mode of recording: Integration time=0.080s, CCIR, Huffyuv
   Time insertion device: IOTA-VTI, v.1.1.42

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

8. ADDITIONAL COMMENTS

Tangra v.1.4.0.499 was used to extract the signal minus background.
Because of the use of an integrating camera a correction of -0.060s was applied.
Occular v.4.00 was used to calculate the D and R times.
According Occular a measured lightdrop of 2.35mag, instead of the predicted 1.78mag, was observed.
A lightcurve is posted here:
http://www.sposetti.ch/images/stories/Minor_planets/2014_Feb_6_Lachesis.png