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)
                         combined magnitude:   mv: 13.5 mag
                         delta-magnitude:      mv:  1.9 mag

2 OBSERVER: 
  Name:                  Andreas SCHWEIZER and Stefan MEISTER
  E-mail:                aschweiz@mac.com
  Address:               Strumbergaecherstr. 3A, 8907 Wettswil, 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, 41km SE of C.L.)
                         Probability: 26 percent

  Single station:        Andreas SCHWEIZER and 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 22 59.836    +/-  0.001 s  : Start observation (UTC)
   D     21 23 19.935    +/-  0.200 s  : Disappearance     (UTC)
   R     21 23 21.535    +/-  0.300 s  : Reappearance      (UTC)
   E     21 24 00.433    +/-  0.001 s  : End observation   (UTC)

   Duration:    1.60     +/-  0.400 s  : (predicted: max. 1.4s)
   
   P     22 23 31        +/-  2     s  : Predicted time    (UTC)

        
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 5m
  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:              960x600, 2x2 Binning, Exposure time 200ms (5 fps), Gain +24dB, Format SER 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:                  below horizon
  Wind:                  yes, some
  Star image stability:  fair
  Altitude of star:      23 deg
  Azimut of star:        281 deg in Taurus

8 ADDITIONAL COMMENTS:    
  Feed:                      UKOCL
  Video recording software:  DvtiCamControl v4.9.1
  Light measurement tool:    Tangra v3.6.23
  Remarks:                   D and R manually determined (mid-frame times),
                             D at center of frame 100, R at center of frame 108.
  
  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)