ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2021 Aug 20, 22:49 (UTC)

  STAR:                  UCAC4 657-025602      mv: 14.0 mag
  ASTEROID:              (1437) Diomedes       mv: 16.0 mag  (diam. 118.0 km)
                         combined magnitude:   mv: 13.8 mag
                         delta-magnitude:      mv:  2.2 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:              N47 31' 10.402" (WGS84)
  Longitude:             E08 34' 14.300" (WGS84)
  Altitude:              550 m (MSL)  (WGS84)
  Single station:        yes   

  Predicted observation: yes (Distance 9.1 km from C.L.)
                         Probability: 44.7 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     22 48 55.163    +/-  0.001 s  : Start observation (UTC)
   D     22 49 18.222    +/-   *    s  : Disappearance     (UTC)
   R     22 49 23.235    +/-   *    s  : Reappearance      (UTC)
   E     22 49 55.312    +/-  0.001 s  : End observation   (UTC)

   Duration:    5.013    +/-   *    s  : (predicted: max. 5.2 s)
   M     22 49 20.729    +/-   *    s  : Mid-event         (UTC)       
   P     22 49 26.410    +/-  5.264 s  : Predicted time    (UTC)

* Accurancy with confidence intervals from PyOTE: 

nominal magDrop: > 2.74
snr: 4.06

D time: [22:49:18.2220]
D: 0.6800 confidence intervals:  {+/- 0.1439} seconds
D: 0.9500 confidence intervals:  {+/- 0.3647} seconds
D: 0.9973 confidence intervals:  {+/- 0.7875} seconds

R time: [22:49:23.2350]
R: 0.6800 confidence intervals:  {+/- 0.1439} seconds
R: 0.9500 confidence intervals:  {+/- 0.3647} seconds
R: 0.9973 confidence intervals:  {+/- 0.7875} seconds

Duration (R - D): 5.0130 seconds
Duration: 0.6800 confidence intervals:  {+/- 0.2184} seconds
Duration: 0.9500 confidence intervals:  {+/- 0.4990} seconds
Duration: 0.9973 confidence intervals:  {+/- 1.0025} 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 1 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:              640x400, Exposure time 500 ms, Gain +20 dB, Binning 3x3, 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.:   fair
  Moon:                  97 percent lit, distance 127 deg
  Wind:                  no
  Star image stability:  fair
  Altitude of star:      17 deg
  Azimut of star:        46 deg in Perseus

8 ADDITIONAL COMMENTS:
  Feed:                      Lucky Star Events
  Video recording software:  DVTI Cam Control v4.12.0-0
  Light measurement tool:    PyMovie v3.14 and PYOTE v3.87 
  Remarks:

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