ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2020 Apr 11, 00:49 (UTC)

  STAR:                  TYC 1393-00727-1      mv: 11.6 mag
  ASTEROID:              (4746) Doi            mv: 18.0 mag  (diam. 21.9 km)
                         delta-magnitude:      mv:  6.4 mag

2 OBSERVER: 
  Name:                  Stefan MEISTER
  E-mail:                meister@dolphins.ch
  Address:               Sandgruebstr. 9, CH-8193 Eglisau, Switzerland

3 OBSERVING STATION: 
  Nearest city:          Buelach, Switzerland
  Station:               Observatory Buelach (MPC Observatory Code: 167)
                         http://www.sternwartebuelach.ch/
  Latitude:              N 47 31 10.4 (WGS84)
  Longitude:             E 08 34 14.3 (WGS84)
  Altitude:              550 m (MSL)  (WGS84)

  Predicted observation: yes (located INSIDE of predicted shadow path, 4 km S to C.L.)
                         Probability: 19%

  Single station:        Stefan MEISTER

                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: NEGATIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event:
   S = Start observation I = Interrupt-start   D = Disappearance
   B = Blink             F = Flash             E = End observation
   I = Interrupt-end     R = Reappearance      
   M = Mid-event         P = Predicted time


  Event  Time (UTC)      Acc.         Comments
  Code   HH MM SS.sss    S.sss
  
   S     00 49 01.106    +/-  0.001 s  : Start observation (UTC)
   D     -               +/-  -        : Disappearance     (UTC)
   R     -               +/-  -        : Reappearance      (UTC)
   E     00 50 23.792    +/-  0.001 s  : End observation   (UTC)

   Duration:        -    +/-  -        : (predicted: max. 3.3s)
   
   P     00 49 47        +/-  7.00  s  : Predicted time    (UTC)

        
5 TELESCOPE: 
  Type:                  Newton Reflector f/5
  Aperture:              500 mm, 4.4% obstruction
  Focal length:          2500 mm
  Magnification:         focal (resulting field of view: 15.5' in x-axis)
  Mount:                 equatorial
  Motor drive:           yes

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accurancy 1m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (Prototype v2b, #8)
                         IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm
                         Website of the project: https://groups.io/g/d-vti-cam/
  Settings:              960x600, 2x Binning, Exposure time 100ms (10 fps), Gain +20dB,
                         Digital Video format SER, 16 Bit, no Dark Frame substracted,
			 correction algorithm "Fixed pattern noise reduction" applied
  Time insertion:        - within Camera, visual and digital GPS timestamp (highly accurate)
                         - Backup with NTP synced PC timestamp (not accurate, just used for comparison purposes)
  
7 OBSERVING CONDITIONS:
  Atmospheric transp.:   poor
  Moon:                  yes, 88% @ 113° distance)
  Wind:                  no
  Star image stability:  fair
  Altitude of star:      14°
  Azimut of star:        281° in Cancer

8 ADDITIONAL COMMENTS:    
  Feed:                      UKOCL
  Video recording software:  DvtiCamControl v4.9.8
  Light measurement tool:    Tangra v3.6.23
  Remarks:                   -
  
  
  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)