ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE: 2021 Décember 30     		    STAR : UCAC4 362-028060

  ASTEROID: (71638) 2000 EL90    

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

3 OBSERVING STATION: Nearest city: AZEREIX (65380) - France
  Station: Observatoire d'Azereix (Home)
  Latitude:  N 43 12 35.4 (WGS84)
  Longitude: W 00 00 46.4 (WGS84)
  Altitude: 340 m

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

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4 TIMING OF EVENTS:           |                                                                |
                          		|  OCCULTATION RECORDED: NEGATIVE |
                         		|                                                                |
                          		+---------------------------------------------------+
  Type of event
  Start observation   Interrupt-start   Disappearance   Blink   Flash
  End observation     Jnterrupt-end     Reappearance    Other (specify)
                                                  
  Event   Time (UT)   	 Acc.   					Comments
  Code   HH MM SS.ss        S.ss
  
    S  -   22:52:16.55     		on frame n°7   		Times Tangra
    D  -   	  	         +/-		 		 
    R  -   		         +/-
    E  -   22:54:44.50 	        	on frame n°606		      idem
    
  Duration : 	 sec  xxxx +/-	Mid-event: xxxxx  (Pédicted 22:53:33  +/- 7,7 sec UT)

  Was your reaction time applied to the above timings? NO
 
5 TELESCOPE: Type: Ritchey Chrétien RC10  - Aperture: 254 mm  -  Magnification: Focus 1340mm (RCx0,67)  -  F/D=5.27
             Mount: Equatorial   -  Motor drive: YES

6 TIMING & RECORDING: 
  Time source: GPS 1 PPS - NMEA date/time
  Sensor: CAMERA ASI178MM -  Binning x2  - Pixel depth mono12  - Exposition : 0,247sec/f  => 4,05 fps
  Gamma na   -    Gain 510 /510   -   Black 137
  Recording: Genika Mode 16bits - format SER 
  Time insertion: module GPS_DCD_Time (Genika)-Synchronisation times UTC/frames with module SER Toolbox (Génika)
  Event insertion (specify): PC Core i5 - Windows10 

7 OBSERVING CONDITIONS:  SKY: clear      Cloud : 10%   	Wind: 0 m/s       Temperature: 11°C      
  Star image stability:  Medium        Minor planet visible: No

8 ADDITIONAL COMMENTS: Reduction under TANGRA 3.7.3 Rev 20200512
  Predicted Max Duration: 1.4sec  
  Predicted Magnitude Drop: 4.5 mag 

  No corrections applied / the test results show a variation of +/- 10ms whatever the exposure times between   20  and 700ms