ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2021 Jun 15, 00:07 (UTC)

  STAR:                  UCAC4 399-073140      mv: 14.3 mag
  ASTEROID:              (8891) Irokawa        mv: 17.5 mag  (diam. 17 km)
                         combined magnitude:   mv: 14.2 mag
                         delta-magnitude:      mv:  3.3 mag

2 OBSERVER:
  Name:                  Stefan Meister and Andreas Schweizer
  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:              N47 31' 10.402" (WGS84)
  Longitude:             E08 34' 14.300" (WGS84)
  Altitude:              550 m (MSL)  (WGS84)
  Single station:        yes  

  Predicted observation: yes, Probability: 13.0 percent


                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  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 06 58.560    +/-  0.001 s  : Start observation (UTC)
   D     00 07 51.345    +/-   *    s  : Disappearance     (UTC)
   R     00 07 52.698    +/-   *    s  : Reappearance      (UTC)
   E     00 07 58.709    +/-  0.001 s  : End observation   (UTC)

   Duration:    1.353    +/-   *    s  : (predicted: max. 1.3 s)
   M     00 07 52.022    +/-   *    s  : Mid-event         (UTC)       
   P     00 07 29.639    +/-  0.000 s  : Predicted time    (UTC)

* Accurancy with confidence intervals from PyOTE: 

nominal magDrop: 2.41
snr: 6.94

D time: [00:07:51.3451]
D: 0.6800 confidence intervals:  {+/- 0.0780} seconds
D: 0.9500 confidence intervals:  {+/- 0.1780} seconds
D: 0.9973 confidence intervals:  {+/- 0.3653} seconds

R time: [00:07:52.6980]
R: 0.6800 confidence intervals:  {+/- 0.0780} seconds
R: 0.9500 confidence intervals:  {+/- 0.1780} seconds
R: 0.9973 confidence intervals:  {+/- 0.3653} seconds

Duration (R - D): 1.3529 seconds
Duration: 0.6800 confidence intervals:  {+/- 0.1158} seconds
Duration: 0.9500 confidence intervals:  {+/- 0.2524} seconds
Duration: 0.9973 confidence intervals:  {+/- 0.4550} seconds


5 TELESCOPE: 
  Type:                  Newton Reflector f/5
  Aperture:              500 mm
  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:     Accuracy 6 m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (DVTI CAM Prototype V3, serial #15)
                         Image Sensor Sony IMX174LLJ-C (1/1.2" 1920x1200 5.86um CIS)
                         Website of the project: https://groups.io/g/d-vti-cam/
  Settings:              960x600, Exposure time 500 ms, Gain +20 dB, Binning 2x2, Format ADV 16-bit
                         with Dark Frame and correction algorithm "Fixed pattern noise red." applied
  Time insertion:        Digital GNSS timestamp into image sensor data stream

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   good
  Moon:                  below horizont
  Wind:                  no
  Star image stability:  fair
  Altitude of star:      32 deg South
  Azimut of star:        184 deg in Ser

8 ADDITIONAL COMMENTS:
  Feed:                      UKOCL
  Video recording software:  DVTI Cam Control v4.12.0-0
  Light measurement tool:    PyMovie v3.1.4 and PYOTE v3.8.7
  Remarks:

  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)