ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2022 Jul 31, 20:57 (UTC)

  STAR:                  UCAC4 415-071087      mv: 15.1 mag
  ASTEROID:              (313) Chaldaea        mv: 13.6 mag  (diam. 71.0 km)
                         combined magnitude:   mv: 13.4 mag
                         delta-magnitude:      mv:  0.2 mag

2 OBSERVER:
  Name:                  Peter Englmaier
  E-mail:                peter@englmaier.ch
  Address:               Furttalstrasse 97, 8046 Zurich, Switzerland

3 OBSERVING STATION:
  Nearest city:          Zurich
  Station:               Private Observatory
  Latitude:              N47 25' 21.144" (WGS84)
  Longitude:             E08 29' 42.932" (WGS84)
  Altitude:              467 m (MSL)  (WGS84)

  Predicted observation: yes (Distance 12.8 km from C.L.)
                         Probability: 100.0 percent

  Single station:        yes

                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: POSTITIVE UNCERTAIN |
                         |                                  |
                         +----------------------------------+
  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     20 56 58.519    +/-  0.001 s  : Start observation (UTC)
   D     20 57 39.544    +/-  15.97 s  : Disappearance     (UTC)
   R     20 57 51.552    +/-  15.97 s  : Reappearance      (UTC)
   E     20 58 28.566    +/-  0.001 s  : End observation   (UTC)

   Duration:   12.001    +/-        s  : (predicted: max. 10.8 s)

   P     20 57 45.162    +/-  1.680 s  : Predicted time    (UTC)

5 TELESCOPE: 
  Type:                  RC
  Aperture:              405 mm
  Focal length:          3240 mm
  Magnification:         f/8
  Mount:                 10 Micron GM 3000 HPS
  Motor drive:           Yes

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accuracy 2 m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (DVTI CAM Prototype V3, serial #25)
                         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 1000 ms, Gain +24 dB, Binning 3x3, Format ADV 16-bit
  Time insertion:        Digital GNSS timestamp into image sensor data stream

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   some high altitude clouds/cirrus seem to be present in the data
  Moon:                  below horizon
  Wind:                  no wind
  Star image stability:  fair
  Altitude of star:      35 deg
  Azimut of star:        190 deg in Ophiuchus

8 ADDITIONAL COMMENTS:
  Feed:                      Community Tags
  Video recording software:  DVTI Cam Control v5.0.1-0
  Light measurement tool:    
  Remarks:               Magnitude drop 0.166 +/- 0.099, snr = 1.52, remote observation from nearby location
			 I should have used shorter exposures, as pointed out by Stefan Meister.

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