ASTEROIDAL OCCULTATION - REPORT FORM

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

1 DATE:                  2021 Feb 20, 22:40 (UTC)

  STAR:                  TYC 0730-02054-1      mv: 10.4 mag
  ASTEROID:              (313) Chaldaea        mv: 12.1 mag  (diam. 94.0 km)
                         combined magnitude:   mv: 10.2 mag
                         delta-magnitude:      mv:  1.9 mag

2 OBSERVER:
  Name:                  Andreas SCHWEIZER
  E-mail:                aschweiz@mac.com
  Address:               Strumbergächerstr. 3A, 8907 Wettswil, Switzerland

3 OBSERVING STATION:
  Nearest city:          Zürich
  Station:               Andreas SCHWEIZER
  Latitude:              N47 20' 30.800" (WGS84)
  Longitude:             E08 28' 22.800" (WGS84)
  Altitude:              580 m (MSL)  (WGS84)

  Predicted observation: yes (Distance 41.9 km from C.L.)
                         Probability: 58.8 percent

  Single station:        Andreas SCHWEIZER

                         +----------------------------------+
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 40 04.505    +/-  0.002 s  : Start observation (UTC)
   D     22 40 32.61     +/-  0.06  s  : Disappearance     (UTC)
   R     22 40 34.60     +/-  0.03  s  : Reappearance      (UTC)
   E     22 40 35.849    +/-  0.002 s  : End observation   (UTC)

   Duration:    1.99     +/-  0.09  s  : (predicted: max. 11.9 s)

   P     22 40 34.329    +/-  3.344 s  : Predicted time    (UTC)

5 TELESCOPE: 
  Type:                  Reflector 107mm
  Aperture:              107 mm
  Focal length:          600 mm
  Magnification:         focal
  Mount:                 Skywatcher EQ-6 Pro
  Motor drive:           yes

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accuracy 2m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (Prototype V3, serial #12)
                         IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm
                         Website of the project: https://groups.io/g/d-vti-cam/
  Settings:              960x600, Exposure time 50ms, Gain +24 dB, Binning 2x2, Format ADV 16-bit
  Time insertion:        Digital GNSS timestamp into image sensor data stream

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   
  Moon:                  61 percent lit, distance 24 deg
  Wind:                  no
  Star image stability:  good
  Altitude of star:      36 deg
  Azimut of star:        238 deg in Orion

8 ADDITIONAL COMMENTS:
  Feed:                      IOTA Updates
  Video recording software:  DVTI Cam Control v4.11.1
  Light measurement tool:    Tangra v3.7.3, AOTA v4.9.5.3
  Remarks:

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