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)
                         combined magnitude:   mv: 11.6 mag
                         delta-magnitude:      mv:  6.4 mag

2 OBSERVER: 
  Name:                  Andreas SCHWEIZER
  E-mail:                aschweiz@mac.com
  Address:               Strumbergaecherstr. 3A, CH-8907 Wettswil, Switzerland

3 OBSERVING STATION: 
  Nearest city:          Wettswil, Switzerland
  Station:
  Latitude:              N 47 20 30.8 (WGS84)
  Longitude:             E 08 28 22.8 (WGS84)
  Altitude:              580 m (MSL)  (WGS84)

  Predicted observation: yes (located INSIDE of predicted shadow path, 17km SW of C.L.)
                         Probability: 18.2 percent
  
  Single station:        Andreas SCHWEIZER

                         +----------------------------------+
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 29.550    +/-  0.001 s  : Start observation (UTC)
   D     -                             : Disappearance     (UTC)
   R     -                             : Reappearance      (UTC)
   E     00 50 12.735    +/-  0.001 s  : End observation   (UTC)

   Duration:                      - s  : (predicted: max. 3.3s)
   
   P     00 49 50        +/-  7.00  s  : Predicted time    (UTC)

        
5 TELESCOPE: 
  Type:                  Refractor f/5.6
  Aperture:              107 mm
  Focal length:          600 mm
  Magnification:         focal (resulting field of view: 65.0' in x-axis)
  Mount:                 equatorial
  Motor drive:           yes, but tracking disabled (pre-pointing)

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accuracy 6m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (Prototype v2b, #7)
                         IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm
                         Website of the project: https://groups.io/g/d-vti-cam/
  Settings:              1920x1200, Exposure time 200ms (5 fps), Gain +20dB, Format ADV 16 Bit
  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.:   good
  Moon:                  yes, 88 percent in 113 deg distance
  Wind:                  no
  Star image stability:  good
  Altitude of star:      14 deg
  Azimut of star:        281 deg in Cancer
  Minor planet visible:  no

8 ADDITIONAL COMMENTS:    
  Feed:                      UKOCL
  Video recording software:  DVTI Cam Control v4.9.8
  Light measurement tool:    Tangra v3.6.23
  Remarks:                   Recorded while I was sleeping (pre-pointing)
  
  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)