ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2020 Mar 22, 21:23 (UTC)

  STAR:                  UCAC4 570-011044      mv: 13.7 mag
  ASTEROID:              (332) Siri            mv: 15.4 mag  (diam. 40.4 km)
                         delta-magnitude:      mv:  1.9 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 OUTSIDE of predicted shadow path, 41 km N to C.L.)
                         Probability: 26%

  Single station:        Stefan MEISTER

                         +----------------------------------+
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     21 23 00.847    +/-  0.1 s  : Start observation (UTC)
   D     21 23 20.154    +/-  0.2 s  : Disappearance     (UTC)
   R     21 23 21.604    +/-  0.2 s  : Reappearance      (UTC)
   E     21 24 00.595    +/-  0.1 s  : End observation   (UTC)

   Duration:    1.450    +/-  0.13s  : (predicted: max. 1.4s)
   
   M     21 23 20.879    +/-  0.13s  : Mid-event         (UTC)      
   P     21 23 30        +/-  2.00s  : Predicted time    (UTC)

        
5 TELESCOPE: 
  Type:                  Ritchey-Chrétien Reflector (Officina Stellare Pro RC 360)
  Aperture:              360 mm, f/8, 20% obstruction
  Focal length:          2880 mm, with reducer actually only 1700 mm
  Magnification:         focal (resulting field of view: 13.5' in x-axis)  xxxxx
  Mount:                 equatorial (10micron GM4000 QCI)
  Motor drive:           yes, also guided with PHD2 on TEC 140

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accurancy 2m
  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 250ms (4 fps), Gain +25dB, Format ADV 16 Bit
                         no Dark Frame substracted, correction algorithm "Fixed pattern noise
                         reduction" applied
  Time insertion:        Reconstructed GPS timestamp based on NTP synced PC timestamp and time diff. to GPS,
                         after full GPS fix received (unfortunately the anntenna cable was plugged in too late)
  
7 OBSERVING CONDITIONS:
  Atmospheric transp.:   good
  Moon:                  below horizont (2% @ 83° distance)
  Wind:                  yes, quite strong
  Star image stability:  fair
  Altitude of star:      23°
  Azimut of star:        281° in Taurus

8 ADDITIONAL COMMENTS:    
  Feed:                      UKOCL
  Video recording software:  DvtiCamControl v4.8.6
  Light measurement tool:    Tangra v3.6.23
  Remarks:                   Observation together with Andreas Schweizer at the same location but with
                             two different telescopes/cameras (see also seperate report from Andreas)
  
  
  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)