ASTEROIDAL OCCULTATION - REPORT FORM

    +------------------------------+  +------------------------------+
    |                EAON          |  |            IOTA/ES           |
    |                              |  |  INTERNATIONAL OCCULTATION   |
    |      EUROPEAN  ASTEROIDAL    |  |       TIMING  ASSOCIATION    |
    |     OCCULTATION NETWORK      |  |          EUROPEAN SECTION    |
    +------------------------------+  +------------------------------+

1 DATE: 2018 May 31                STAR: 4UC  531-050024

  ASTEROID: (221)Eos           

2 OBSERVER: Name:  Gérard VAUDESCAL           Abbr:VDC
            E-mail: gg.vaudescal@free.fr
            Address: 65380 Azereix - France

	    Name:                             Abbr:
	    E-mail:
	    Address: 


3 OBSERVING STATION: Nearest city: VISKER(65200)
  Station: Observatoire de Biscarmiau
  Latitude:  N 43 08 40.4 (WGS84)
  Longitude: E 00 03 31.8 (WGS84)
  Altitude: 488 m

  Single, OR Double or Multiple station (Specify observer's name): Single

                          +----------------------------------+
4 TIMING OF EVENTS:       |                                  |
                          | OCCULTATION RECORDED: UNCERTAIN?|
                          |                                  |
                          +----------------------------------+
  Type of event
  Start observation   Interrupt-start   Disappearance   Blink   Flash
  End observation     Jnterrupt-end     Reappearance    Other (specify)

                                                  Comments
  Event   Time (UT)   	 Acc.   
  Code   HH MM SS.ss  	 S.ss
  
    S  - 22:15:54.57     	on frame n°32   (correction Gerhard Dangl)
    D  - 22:16:23.05     +/-0.32
    R  - 22:16:28.17	 +/-0.32
    E  - 22:17:22.89 	        on frame n°170		   "
  
  Duration: 5.12sec(forecasts 4,7s)- Mid-event: 22:16:25.61 (forecasts 22:16:28 UT +/-3.5s)

  Was your reaction time applied to the above timings? NO

5 TELESCOPE: Type: NEWTON          Aperture: 305 mm        Magnification: Focus 1188 mm
             Mount: Equatorial          Motor drive: YES

6 TIMING & RECORDING: 
  Time source: GPS 1 PPS 
  Sensor: CAMERA WATEC 910HX/RC CCIR -  integrated Shutter Low x32 (0,64sec/f) - 
  Gamma 1 - Gain 32dB
  Recording: OccuRec V 3.2.0 Beta and Grabber Lindy USB2 - vidéo mode AAV
  Time  insertion (specify):IOTA VTI V3 (CCIR)
  Event insertion (specify): PC-Windows7

7 OBSERVING CONDITIONS: Cloudy SKY (50%)     Wind: 0 ms   Temperature: 15 °C
  Star image stability: good	variable transparency      Minor planet visible: Yes

8 ADDITIONAL COMMENTS: Reduction under TANGRA 3.6.15 end AOTA v4.5.3.0
Note:No normalization on the flows (Tangra) of the star occulted with the star of comparison. The comparison star is too far from the target. The presumptions of a positive occultation remain however strong.