ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2020 May 31, 01:00 (UTC)

  STAR:                  UCAC4 390-088039      mv: 12.3 mag
  ASTEROID:              (1353) Maartje        mv: 14.1 mag (diam. 39.0 km)
                         combined magnitude:   mv: 12.1 mag
                         delta-magnitude:      mv:  2.0 mag

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

3 OBSERVING STATION: 
  Nearest city:          Engelberg, Switzerland
  Station:
  Latitude:              N 46 49 00.1 (WGS84)
  Longitude:             E 08 25 34.7 (WGS84)
  Altitude:              1000m (MSL)  (WGS84)

  Predicted observation: no (located OUTSIDE of predicted shadow path, 102km NE of C.L.)
                         Probability: 14.3 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     01 00 03.340    +/-  0.001 s  : Start observation (UTC)
   D     -                             : Disappearance     (UTC)
   R     -                             : Reappearance      (UTC)
   E     01 01 03.850    +/-  0.001 s  : End observation   (UTC)

   Duration:                      - s  : (predicted: max. 4.3s)
   
   P     01 00 34        +/-  8     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

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accuracy 1m
  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 500ms (2 fps), Gain +16dB, Format ADV 16 Bit
  Time insertion:        - within Camera, visual and digital GPS timestamp
                         - Backup with NTP synced PC timestamp

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   good
  Moon:                  60 percent, but only 1 degree above horizon
  Wind:                  no
  Star image stability:  stable
  Altitude of star:      31 deg
  Azimut of star:        177 deg in Serpens
  Minor planet visible:  no

8 ADDITIONAL COMMENTS:    
  Feed:                      UKOCL
  Video recording software:  DVTI Cam Control v4.9.10
  Light measurement tool:    PyMovie v2.7.0
  Remarks:                   Observed from holiday location in the Swiss mountains
  
  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)